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+<?php
+
+/**
+ * @addtogroup hooks
+ * @{
+ */
+
+/**
+ * Exposes "pseudo-field" components on fieldable entities.
+ *
+ * Field UI's "Manage fields" and "Manage display" pages let users re-order
+ * fields, but also non-field components. For nodes, these include the title,
+ * poll choices, and other elements exposed by modules through hook_form() or
+ * hook_form_alter().
+ *
+ * Fieldable entities or modules that want to have their components supported
+ * should expose them using this hook. The user-defined settings (weight,
+ * visible) are automatically applied on rendered forms and displayed
+ * entities in a #pre_render callback added by field_attach_form() and
+ * field_attach_view().
+ *
+ * @see _field_extra_fields_pre_render()
+ * @see hook_field_extra_fields_alter()
+ *
+ * @return
+ * A nested array of 'pseudo-field' elements. Each list is nested within the
+ * following keys: entity type, bundle name, context (either 'form' or
+ * 'display'). The keys are the name of the elements as appearing in the
+ * renderable array (either the entity form or the displayed entity). The
+ * value is an associative array:
+ * - label: The human readable name of the element.
+ * - description: A short description of the element contents.
+ * - weight: The default weight of the element.
+ * - edit: (optional) String containing markup (normally a link) used as the
+ * element's 'edit' operation in the administration interface. Only for
+ * 'form' context.
+ * - delete: (optional) String containing markup (normally a link) used as the
+ * element's 'delete' operation in the administration interface. Only for
+ * 'form' context.
+ */
+function hook_field_extra_fields() {
+ $extra['node']['poll'] = array(
+ 'form' => array(
+ 'choice_wrapper' => array(
+ 'label' => t('Poll choices'),
+ 'description' => t('Poll choices'),
+ 'weight' => -4,
+ ),
+ 'settings' => array(
+ 'label' => t('Poll settings'),
+ 'description' => t('Poll module settings'),
+ 'weight' => -3,
+ ),
+ ),
+ 'display' => array(
+ 'poll_view_voting' => array(
+ 'label' => t('Poll vote'),
+ 'description' => t('Poll vote'),
+ 'weight' => 0,
+ ),
+ 'poll_view_results' => array(
+ 'label' => t('Poll results'),
+ 'description' => t('Poll results'),
+ 'weight' => 0,
+ ),
+ )
+ );
+
+ return $extra;
+}
+
+/**
+ * Alter "pseudo-field" components on fieldable entities.
+ *
+ * @param $info
+ * The associative array of 'pseudo-field' components.
+ *
+ * @see hook_field_extra_fields()
+ */
+function hook_field_extra_fields_alter(&$info) {
+ // Force node title to always be at the top of the list by default.
+ foreach (node_type_get_types() as $bundle) {
+ if (isset($info['node'][$bundle->type]['form']['title'])) {
+ $info['node'][$bundle->type]['form']['title']['weight'] = -20;
+ }
+ }
+}
+
+/**
+ * @defgroup field_types Field Types API
+ * @{
+ * Define field types.
+ *
+ * In the Field API, each field has a type, which determines what kind of data
+ * (integer, string, date, etc.) the field can hold, which settings it provides,
+ * and so on. The data type(s) accepted by a field are defined in
+ * hook_field_schema(); other basic properties of a field are defined in
+ * hook_field_info(). The other hooks below are called by the Field Attach API
+ * to perform field-type-specific actions.
+ *
+ * The Field Types API also defines two kinds of pluggable handlers: widgets
+ * and formatters. @link field_widget Widgets @endlink specify how the field
+ * appears in edit forms, while @link field_formatter formatters @endlink
+ * specify how the field appears in displayed entities.
+ *
+ * A third kind of pluggable handlers, storage backends, is defined by the
+ * @link field_storage Field Storage API @endlink.
+ *
+ * See @link field Field API @endlink for information about the other parts of
+ * the Field API.
+ */
+
+/**
+ * Define Field API field types.
+ *
+ * Along with this hook, you also need to implement other hooks. See
+ * @link field_types Field Types API @endlink for more information.
+ *
+ * @return
+ * An array whose keys are field type names and whose values are arrays
+ * describing the field type, with the following key/value pairs:
+ * - label: The human-readable name of the field type.
+ * - description: A short description for the field type.
+ * - settings: An array whose keys are the names of the settings available
+ * for the field type, and whose values are the default values for those
+ * settings.
+ * - instance_settings: An array whose keys are the names of the settings
+ * available for instances of the field type, and whose values are the
+ * default values for those settings. Instance-level settings can have
+ * different values on each field instance, and thus allow greater
+ * flexibility than field-level settings. It is recommended to put settings
+ * at the instance level whenever possible. Notable exceptions: settings
+ * acting on the schema definition, or settings that Views needs to use
+ * across field instances (for example, the list of allowed values).
+ * - default_widget: The machine name of the default widget to be used by
+ * instances of this field type, when no widget is specified in the
+ * instance definition. This widget must be available whenever the field
+ * type is available (i.e. provided by the field type module, or by a module
+ * the field type module depends on).
+ * - default_formatter: The machine name of the default formatter to be used
+ * by instances of this field type, when no formatter is specified in the
+ * instance definition. This formatter must be available whenever the field
+ * type is available (i.e. provided by the field type module, or by a module
+ * the field type module depends on).
+ * - no_ui: (optional) A boolean specifying that users should not be allowed
+ * to create fields and instances of this field type through the UI. Such
+ * fields can only be created programmatically with field_create_field()
+ * and field_create_instance(). Defaults to FALSE.
+ *
+ * @see hook_field_info_alter()
+ */
+function hook_field_info() {
+ return array(
+ 'text' => array(
+ 'label' => t('Text'),
+ 'description' => t('This field stores varchar text in the database.'),
+ 'settings' => array('max_length' => 255),
+ 'instance_settings' => array('text_processing' => 0),
+ 'default_widget' => 'text_textfield',
+ 'default_formatter' => 'text_default',
+ ),
+ 'text_long' => array(
+ 'label' => t('Long text'),
+ 'description' => t('This field stores long text in the database.'),
+ 'settings' => array('max_length' => ''),
+ 'instance_settings' => array('text_processing' => 0),
+ 'default_widget' => 'text_textarea',
+ 'default_formatter' => 'text_default',
+ ),
+ 'text_with_summary' => array(
+ 'label' => t('Long text and summary'),
+ 'description' => t('This field stores long text in the database along with optional summary text.'),
+ 'settings' => array('max_length' => ''),
+ 'instance_settings' => array('text_processing' => 1, 'display_summary' => 0),
+ 'default_widget' => 'text_textarea_with_summary',
+ 'default_formatter' => 'text_summary_or_trimmed',
+ ),
+ );
+}
+
+/**
+ * Perform alterations on Field API field types.
+ *
+ * @param $info
+ * Array of information on field types exposed by hook_field_info()
+ * implementations.
+ */
+function hook_field_info_alter(&$info) {
+ // Add a setting to all field types.
+ foreach ($info as $field_type => $field_type_info) {
+ $info[$field_type]['settings'] += array(
+ 'mymodule_additional_setting' => 'default value',
+ );
+ }
+
+ // Change the default widget for fields of type 'foo'.
+ if (isset($info['foo'])) {
+ $info['foo']['default widget'] = 'mymodule_widget';
+ }
+}
+
+/**
+ * Define the Field API schema for a field structure.
+ *
+ * This is invoked when a field is created, in order to obtain the database
+ * schema from the module that defines the field's type.
+ *
+ * This hook must be defined in the module's .install file for it to be detected
+ * during installation and upgrade.
+ *
+ * @param $field
+ * A field structure.
+ *
+ * @return
+ * An associative array with the following keys:
+ * - columns: An array of Schema API column specifications, keyed by column
+ * name. This specifies what comprises a value for a given field. For
+ * example, a value for a number field is simply 'value', while a value for
+ * a formatted text field is the combination of 'value' and 'format'. It is
+ * recommended to avoid having the column definitions depend on field
+ * settings when possible. No assumptions should be made on how storage
+ * engines internally use the original column name to structure their
+ * storage.
+ * - indexes: (optional) An array of Schema API indexes definitions. Only
+ * columns that appear in the 'columns' array are allowed. Those indexes
+ * will be used as default indexes. Callers of field_create_field() can
+ * specify additional indexes, or, at their own risk, modify the default
+ * indexes specified by the field-type module. Some storage engines might
+ * not support indexes.
+ * - foreign keys: (optional) An array of Schema API foreign keys
+ * definitions.
+ */
+function hook_field_schema($field) {
+ if ($field['type'] == 'text_long') {
+ $columns = array(
+ 'value' => array(
+ 'type' => 'text',
+ 'size' => 'big',
+ 'not null' => FALSE,
+ ),
+ );
+ }
+ else {
+ $columns = array(
+ 'value' => array(
+ 'type' => 'varchar',
+ 'length' => $field['settings']['max_length'],
+ 'not null' => FALSE,
+ ),
+ );
+ }
+ $columns += array(
+ 'format' => array(
+ 'type' => 'varchar',
+ 'length' => 255,
+ 'not null' => FALSE,
+ ),
+ );
+ return array(
+ 'columns' => $columns,
+ 'indexes' => array(
+ 'format' => array('format'),
+ ),
+ 'foreign keys' => array(
+ 'format' => array(
+ 'table' => 'filter_format',
+ 'columns' => array('format' => 'format'),
+ ),
+ ),
+ );
+}
+
+/**
+ * Define custom load behavior for this module's field types.
+ *
+ * Unlike most other field hooks, this hook operates on multiple entities. The
+ * $entities, $instances and $items parameters are arrays keyed by entity ID.
+ * For performance reasons, information for all available entity should be
+ * loaded in a single query where possible.
+ *
+ * Note that the changes made to the field values get cached by the field cache
+ * for subsequent loads. You should never use this hook to load fieldable
+ * entities, since this is likely to cause infinite recursions when
+ * hook_field_load() is run on those as well. Use
+ * hook_field_formatter_prepare_view() instead.
+ *
+ * Make changes or additions to field values by altering the $items parameter by
+ * reference. There is no return value.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entities
+ * Array of entities being loaded, keyed by entity ID.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instances
+ * Array of instance structures for $field for each entity, keyed by entity
+ * ID.
+ * @param $langcode
+ * The language code associated with $items.
+ * @param $items
+ * Array of field values already loaded for the entities, keyed by entity ID.
+ * Store your changes in this parameter (passed by reference).
+ * @param $age
+ * FIELD_LOAD_CURRENT to load the most recent revision for all fields, or
+ * FIELD_LOAD_REVISION to load the version indicated by each entity.
+ */
+function hook_field_load($entity_type, $entities, $field, $instances, $langcode, &$items, $age) {
+ // Sample code from text.module: precompute sanitized strings so they are
+ // stored in the field cache.
+ foreach ($entities as $id => $entity) {
+ foreach ($items[$id] as $delta => $item) {
+ // Only process items with a cacheable format, the rest will be handled
+ // by formatters if needed.
+ if (empty($instances[$id]['settings']['text_processing']) || filter_format_allowcache($item['format'])) {
+ $items[$id][$delta]['safe_value'] = isset($item['value']) ? _text_sanitize($instances[$id], $langcode, $item, 'value') : '';
+ if ($field['type'] == 'text_with_summary') {
+ $items[$id][$delta]['safe_summary'] = isset($item['summary']) ? _text_sanitize($instances[$id], $langcode, $item, 'summary') : '';
+ }
+ }
+ }
+ }
+}
+
+/**
+ * Prepare field values prior to display.
+ *
+ * This hook is invoked before the field values are handed to formatters
+ * for display, and runs before the formatters' own
+ * hook_field_formatter_prepare_view().
+ *
+ * Unlike most other field hooks, this hook operates on multiple entities. The
+ * $entities, $instances and $items parameters are arrays keyed by entity ID.
+ * For performance reasons, information for all available entities should be
+ * loaded in a single query where possible.
+ *
+ * Make changes or additions to field values by altering the $items parameter by
+ * reference. There is no return value.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entities
+ * Array of entities being displayed, keyed by entity ID.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instances
+ * Array of instance structures for $field for each entity, keyed by entity
+ * ID.
+ * @param $langcode
+ * The language associated to $items.
+ * @param $items
+ * $entity->{$field['field_name']}, or an empty array if unset.
+ */
+function hook_field_prepare_view($entity_type, $entities, $field, $instances, $langcode, &$items) {
+ // Sample code from image.module: if there are no images specified at all,
+ // use the default image.
+ foreach ($entities as $id => $entity) {
+ if (empty($items[$id]) && $field['settings']['default_image']) {
+ if ($file = file_load($field['settings']['default_image'])) {
+ $items[$id][0] = (array) $file + array(
+ 'is_default' => TRUE,
+ 'alt' => '',
+ 'title' => '',
+ );
+ }
+ }
+ }
+}
+
+/**
+ * Validate this module's field data.
+ *
+ * If there are validation problems, add to the $errors array (passed by
+ * reference). There is no return value.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entity
+ * The entity for the operation.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instance
+ * The instance structure for $field on $entity's bundle.
+ * @param $langcode
+ * The language associated with $items.
+ * @param $items
+ * $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+ * @param $errors
+ * The array of errors (keyed by field name, language code, and delta) that
+ * have already been reported for the entity. The function should add its
+ * errors to this array. Each error is an associative array with the following
+ * keys and values:
+ * - error: An error code (should be a string prefixed with the module name).
+ * - message: The human readable message to be displayed.
+ */
+function hook_field_validate($entity_type, $entity, $field, $instance, $langcode, $items, &$errors) {
+ foreach ($items as $delta => $item) {
+ if (!empty($item['value'])) {
+ if (!empty($field['settings']['max_length']) && drupal_strlen($item['value']) > $field['settings']['max_length']) {
+ $errors[$field['field_name']][$langcode][$delta][] = array(
+ 'error' => 'text_max_length',
+ 'message' => t('%name: the value may not be longer than %max characters.', array('%name' => $instance['label'], '%max' => $field['settings']['max_length'])),
+ );
+ }
+ }
+ }
+}
+
+/**
+ * Define custom presave behavior for this module's field types.
+ *
+ * Make changes or additions to field values by altering the $items parameter by
+ * reference. There is no return value.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entity
+ * The entity for the operation.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instance
+ * The instance structure for $field on $entity's bundle.
+ * @param $langcode
+ * The language associated with $items.
+ * @param $items
+ * $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+ */
+function hook_field_presave($entity_type, $entity, $field, $instance, $langcode, &$items) {
+ if ($field['type'] == 'number_decimal') {
+ // Let PHP round the value to ensure consistent behavior across storage
+ // backends.
+ foreach ($items as $delta => $item) {
+ if (isset($item['value'])) {
+ $items[$delta]['value'] = round($item['value'], $field['settings']['scale']);
+ }
+ }
+ }
+}
+
+/**
+ * Define custom insert behavior for this module's field data.
+ *
+ * This hook is invoked from field_attach_insert() on the module that defines a
+ * field, during the process of inserting an entity object (node, taxonomy term,
+ * etc.). It is invoked just before the data for this field on the particular
+ * entity object is inserted into field storage. Only field modules that are
+ * storing or tracking information outside the standard field storage mechanism
+ * need to implement this hook.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entity
+ * The entity for the operation.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instance
+ * The instance structure for $field on $entity's bundle.
+ * @param $langcode
+ * The language associated with $items.
+ * @param $items
+ * $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+ *
+ * @see hook_field_update()
+ * @see hook_field_delete()
+ */
+function hook_field_insert($entity_type, $entity, $field, $instance, $langcode, &$items) {
+ if (variable_get('taxonomy_maintain_index_table', TRUE) && $field['storage']['type'] == 'field_sql_storage' && $entity_type == 'node' && $entity->status) {
+ $query = db_insert('taxonomy_index')->fields(array('nid', 'tid', 'sticky', 'created', ));
+ foreach ($items as $item) {
+ $query->values(array(
+ 'nid' => $entity->nid,
+ 'tid' => $item['tid'],
+ 'sticky' => $entity->sticky,
+ 'created' => $entity->created,
+ ));
+ }
+ $query->execute();
+ }
+}
+
+/**
+ * Define custom update behavior for this module's field data.
+ *
+ * This hook is invoked from field_attach_update() on the module that defines a
+ * field, during the process of updating an entity object (node, taxonomy term,
+ * etc.). It is invoked just before the data for this field on the particular
+ * entity object is updated into field storage. Only field modules that are
+ * storing or tracking information outside the standard field storage mechanism
+ * need to implement this hook.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entity
+ * The entity for the operation.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instance
+ * The instance structure for $field on $entity's bundle.
+ * @param $langcode
+ * The language associated with $items.
+ * @param $items
+ * $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+ *
+ * @see hook_field_insert()
+ * @see hook_field_delete()
+ */
+function hook_field_update($entity_type, $entity, $field, $instance, $langcode, &$items) {
+ if (variable_get('taxonomy_maintain_index_table', TRUE) && $field['storage']['type'] == 'field_sql_storage' && $entity_type == 'node') {
+ $first_call = &drupal_static(__FUNCTION__, array());
+
+ // We don't maintain data for old revisions, so clear all previous values
+ // from the table. Since this hook runs once per field, per object, make
+ // sure we only wipe values once.
+ if (!isset($first_call[$entity->nid])) {
+ $first_call[$entity->nid] = FALSE;
+ db_delete('taxonomy_index')->condition('nid', $entity->nid)->execute();
+ }
+ // Only save data to the table if the node is published.
+ if ($entity->status) {
+ $query = db_insert('taxonomy_index')->fields(array('nid', 'tid', 'sticky', 'created'));
+ foreach ($items as $item) {
+ $query->values(array(
+ 'nid' => $entity->nid,
+ 'tid' => $item['tid'],
+ 'sticky' => $entity->sticky,
+ 'created' => $entity->created,
+ ));
+ }
+ $query->execute();
+ }
+ }
+}
+
+/**
+ * Update the storage information for a field.
+ *
+ * This is invoked on the field's storage module from field_update_field(),
+ * before the new field information is saved to the database. The field storage
+ * module should update its storage tables to agree with the new field
+ * information. If there is a problem, the field storage module should throw an
+ * exception.
+ *
+ * @param $field
+ * The updated field structure to be saved.
+ * @param $prior_field
+ * The previously-saved field structure.
+ * @param $has_data
+ * TRUE if the field has data in storage currently.
+ */
+function hook_field_storage_update_field($field, $prior_field, $has_data) {
+ if (!$has_data) {
+ // There is no data. Re-create the tables completely.
+ $prior_schema = _field_sql_storage_schema($prior_field);
+ foreach ($prior_schema as $name => $table) {
+ db_drop_table($name, $table);
+ }
+ $schema = _field_sql_storage_schema($field);
+ foreach ($schema as $name => $table) {
+ db_create_table($name, $table);
+ }
+ }
+ else {
+ // There is data. See field_sql_storage_field_storage_update_field() for
+ // an example of what to do to modify the schema in place, preserving the
+ // old data as much as possible.
+ }
+ drupal_get_schema(NULL, TRUE);
+}
+
+/**
+ * Define custom delete behavior for this module's field data.
+ *
+ * This hook is invoked from field_attach_delete() on the module that defines a
+ * field, during the process of deleting an entity object (node, taxonomy term,
+ * etc.). It is invoked just before the data for this field on the particular
+ * entity object is deleted from field storage. Only field modules that are
+ * storing or tracking information outside the standard field storage mechanism
+ * need to implement this hook.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entity
+ * The entity for the operation.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instance
+ * The instance structure for $field on $entity's bundle.
+ * @param $langcode
+ * The language associated with $items.
+ * @param $items
+ * $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+ *
+ * @see hook_field_insert()
+ * @see hook_field_update()
+ */
+function hook_field_delete($entity_type, $entity, $field, $instance, $langcode, &$items) {
+ list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
+ foreach ($items as $delta => $item) {
+ // For hook_file_references(), remember that this is being deleted.
+ $item['file_field_name'] = $field['field_name'];
+ // Pass in the ID of the object that is being removed so all references can
+ // be counted in hook_file_references().
+ $item['file_field_type'] = $entity_type;
+ $item['file_field_id'] = $id;
+ file_field_delete_file($item, $field, $entity_type, $id);
+ }
+}
+
+/**
+ * Define custom revision delete behavior for this module's field types.
+ *
+ * This hook is invoked just before the data is deleted from field storage
+ * in field_attach_delete_revision(), and will only be called for fieldable
+ * types that are versioned.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entity
+ * The entity for the operation.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instance
+ * The instance structure for $field on $entity's bundle.
+ * @param $langcode
+ * The language associated with $items.
+ * @param $items
+ * $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+ */
+function hook_field_delete_revision($entity_type, $entity, $field, $instance, $langcode, &$items) {
+ list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
+ foreach ($items as $delta => $item) {
+ // For hook_file_references, remember that this file is being deleted.
+ $item['file_field_name'] = $field['field_name'];
+ if (file_field_delete_file($item, $field, $entity_type, $id)) {
+ $items[$delta] = NULL;
+ }
+ }
+}
+
+/**
+ * Define custom prepare_translation behavior for this module's field types.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entity
+ * The entity for the operation.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instance
+ * The instance structure for $field on $entity's bundle.
+ * @param $langcode
+ * The language associated to $items.
+ * @param $items
+ * $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+ * @param $source_entity
+ * The source entity from which field values are being copied.
+ * @param $source_langcode
+ * The source language from which field values are being copied.
+ */
+function hook_field_prepare_translation($entity_type, $entity, $field, $instance, $langcode, &$items, $source_entity, $source_langcode) {
+ // If the translating user is not permitted to use the assigned text format,
+ // we must not expose the source values.
+ $field_name = $field['field_name'];
+ $formats = filter_formats();
+ $format_id = $source_entity->{$field_name}[$source_langcode][0]['format'];
+ if (!filter_access($formats[$format_id])) {
+ $items = array();
+ }
+}
+
+/**
+ * Define what constitutes an empty item for a field type.
+ *
+ * @param $item
+ * An item that may or may not be empty.
+ * @param $field
+ * The field to which $item belongs.
+ *
+ * @return
+ * TRUE if $field's type considers $item not to contain any data;
+ * FALSE otherwise.
+ */
+function hook_field_is_empty($item, $field) {
+ if (empty($item['value']) && (string) $item['value'] !== '0') {
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/**
+ * @} End of "defgroup field_types".
+ */
+
+/**
+ * @defgroup field_widget Field Widget API
+ * @{
+ * Define Field API widget types.
+ *
+ * Field API widgets specify how fields are displayed in edit forms. Fields of a
+ * given @link field_types field type @endlink may be edited using more than one
+ * widget. In this case, the Field UI module allows the site builder to choose
+ * which widget to use. Widget types are defined by implementing
+ * hook_field_widget_info().
+ *
+ * Widgets are @link forms_api_reference.html Form API @endlink elements with
+ * additional processing capabilities. Widget hooks are typically called by the
+ * Field Attach API during the creation of the field form structure with
+ * field_attach_form().
+ *
+ * @see field
+ * @see field_types
+ * @see field_formatter
+ */
+
+/**
+ * Expose Field API widget types.
+ *
+ * @return
+ * An array describing the widget types implemented by the module.
+ * The keys are widget type names. To avoid name clashes, widget type
+ * names should be prefixed with the name of the module that exposes them.
+ * The values are arrays describing the widget type, with the following
+ * key/value pairs:
+ * - label: The human-readable name of the widget type.
+ * - description: A short description for the widget type.
+ * - field types: An array of field types the widget supports.
+ * - settings: An array whose keys are the names of the settings available
+ * for the widget type, and whose values are the default values for those
+ * settings.
+ * - behaviors: (optional) An array describing behaviors of the widget, with
+ * the following elements:
+ * - multiple values: One of the following constants:
+ * - FIELD_BEHAVIOR_DEFAULT: (default) If the widget allows the input of
+ * one single field value (most common case). The widget will be
+ * repeated for each value input.
+ * - FIELD_BEHAVIOR_CUSTOM: If one single copy of the widget can receive
+ * several field values. Examples: checkboxes, multiple select,
+ * comma-separated textfield.
+ * - default value: One of the following constants:
+ * - FIELD_BEHAVIOR_DEFAULT: (default) If the widget accepts default
+ * values.
+ * - FIELD_BEHAVIOR_NONE: if the widget does not support default values.
+ * - weight: (optional) An integer to determine the weight of this widget
+ * relative to other widgets in the Field UI when selecting a widget for a
+ * given field instance.
+ *
+ * @see hook_field_widget_info_alter()
+ * @see hook_field_widget_form()
+ * @see hook_field_widget_form_alter()
+ * @see hook_field_widget_WIDGET_TYPE_form_alter()
+ * @see hook_field_widget_error()
+ * @see hook_field_widget_settings_form()
+ */
+function hook_field_widget_info() {
+ return array(
+ 'text_textfield' => array(
+ 'label' => t('Text field'),
+ 'field types' => array('text'),
+ 'settings' => array('size' => 60),
+ 'behaviors' => array(
+ 'multiple values' => FIELD_BEHAVIOR_DEFAULT,
+ 'default value' => FIELD_BEHAVIOR_DEFAULT,
+ ),
+ ),
+ 'text_textarea' => array(
+ 'label' => t('Text area (multiple rows)'),
+ 'field types' => array('text_long'),
+ 'settings' => array('rows' => 5),
+ 'behaviors' => array(
+ 'multiple values' => FIELD_BEHAVIOR_DEFAULT,
+ 'default value' => FIELD_BEHAVIOR_DEFAULT,
+ ),
+ ),
+ 'text_textarea_with_summary' => array(
+ 'label' => t('Text area with a summary'),
+ 'field types' => array('text_with_summary'),
+ 'settings' => array('rows' => 20, 'summary_rows' => 5),
+ 'behaviors' => array(
+ 'multiple values' => FIELD_BEHAVIOR_DEFAULT,
+ 'default value' => FIELD_BEHAVIOR_DEFAULT,
+ ),
+ // As an advanced widget, force it to sink to the bottom of the choices.
+ 'weight' => 2,
+ ),
+ );
+}
+
+/**
+ * Perform alterations on Field API widget types.
+ *
+ * @param $info
+ * Array of informations on widget types exposed by hook_field_widget_info()
+ * implementations.
+ */
+function hook_field_widget_info_alter(&$info) {
+ // Add a setting to a widget type.
+ $info['text_textfield']['settings'] += array(
+ 'mymodule_additional_setting' => 'default value',
+ );
+
+ // Let a new field type re-use an existing widget.
+ $info['options_select']['field types'][] = 'my_field_type';
+}
+
+/**
+ * Return the form for a single field widget.
+ *
+ * Field widget form elements should be based on the passed-in $element, which
+ * contains the base form element properties derived from the field
+ * configuration.
+ *
+ * Field API will set the weight, field name and delta values for each form
+ * element. If there are multiple values for this field, the Field API will
+ * invoke this hook as many times as needed.
+ *
+ * Note that, depending on the context in which the widget is being included
+ * (regular entity form, field configuration form, advanced search form...),
+ * the values for $field and $instance might be different from the "official"
+ * definitions returned by field_info_field() and field_info_instance().
+ * Examples: mono-value widget even if the field is multi-valued, non-required
+ * widget even if the field is 'required'...
+ *
+ * Therefore, the FAPI element callbacks (such as #process, #element_validate,
+ * #value_callback...) used by the widget cannot use the field_info_field()
+ * or field_info_instance() functions to retrieve the $field or $instance
+ * definitions they should operate on. The field_widget_field() and
+ * field_widget_instance() functions should be used instead to fetch the
+ * current working definitions from $form_state, where Field API stores them.
+ *
+ * Alternatively, hook_field_widget_form() can extract the needed specific
+ * properties from $field and $instance and set them as ad-hoc
+ * $element['#custom'] properties, for later use by its element callbacks.
+ *
+ * Other modules may alter the form element provided by this function using
+ * hook_field_widget_form_alter().
+ *
+ * @param $form
+ * The form structure where widgets are being attached to. This might be a
+ * full form structure, or a sub-element of a larger form.
+ * @param $form_state
+ * An associative array containing the current state of the form.
+ * @param $field
+ * The field structure.
+ * @param $instance
+ * The field instance.
+ * @param $langcode
+ * The language associated with $items.
+ * @param $items
+ * Array of default values for this field.
+ * @param $delta
+ * The order of this item in the array of subelements (0, 1, 2, etc).
+ * @param $element
+ * A form element array containing basic properties for the widget:
+ * - #entity_type: The name of the entity the field is attached to.
+ * - #bundle: The name of the field bundle the field is contained in.
+ * - #field_name: The name of the field.
+ * - #language: The language the field is being edited in.
+ * - #field_parents: The 'parents' space for the field in the form. Most
+ * widgets can simply overlook this property. This identifies the
+ * location where the field values are placed within
+ * $form_state['values'], and is used to access processing information
+ * for the field through the field_form_get_state() and
+ * field_form_set_state() functions.
+ * - #columns: A list of field storage columns of the field.
+ * - #title: The sanitized element label for the field instance, ready for
+ * output.
+ * - #description: The sanitized element description for the field instance,
+ * ready for output.
+ * - #required: A Boolean indicating whether the element value is required;
+ * for required multiple value fields, only the first widget's values are
+ * required.
+ * - #delta: The order of this item in the array of subelements; see $delta
+ * above.
+ *
+ * @return
+ * The form elements for a single widget for this field.
+ *
+ * @see field_widget_field()
+ * @see field_widget_instance()
+ * @see hook_field_widget_form_alter()
+ * @see hook_field_widget_WIDGET_TYPE_form_alter()
+ */
+function hook_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
+ $element += array(
+ '#type' => $instance['widget']['type'],
+ '#default_value' => isset($items[$delta]) ? $items[$delta] : '',
+ );
+ return array('value' => $element);
+}
+
+/**
+ * Alter forms for field widgets provided by other modules.
+ *
+ * @param $element
+ * The field widget form element as constructed by hook_field_widget_form().
+ * @param $form_state
+ * An associative array containing the current state of the form.
+ * @param $context
+ * An associative array containing the following key-value pairs, matching the
+ * arguments received by hook_field_widget_form():
+ * - form: The form structure to which widgets are being attached. This may be
+ * a full form structure, or a sub-element of a larger form.
+ * - field: The field structure.
+ * - instance: The field instance structure.
+ * - langcode: The language associated with $items.
+ * - items: Array of default values for this field.
+ * - delta: The order of this item in the array of subelements (0, 1, 2, etc).
+ *
+ * @see hook_field_widget_form()
+ * @see hook_field_widget_WIDGET_TYPE_form_alter()
+ */
+function hook_field_widget_form_alter(&$element, &$form_state, $context) {
+ // Add a css class to widget form elements for all fields of type mytype.
+ if ($context['field']['type'] == 'mytype') {
+ // Be sure not to overwrite existing attributes.
+ $element['#attributes']['class'][] = 'myclass';
+ }
+}
+
+/**
+ * Alter widget forms for a specific widget provided by another module.
+ *
+ * Modules can implement hook_field_widget_WIDGET_TYPE_form_alter() to modify a
+ * specific widget form, rather than using hook_field_widget_form_alter() and
+ * checking the widget type.
+ *
+ * @param $element
+ * The field widget form element as constructed by hook_field_widget_form().
+ * @param $form_state
+ * An associative array containing the current state of the form.
+ * @param $context
+ * An associative array containing the following key-value pairs, matching the
+ * arguments received by hook_field_widget_form():
+ * - "form": The form structure where widgets are being attached to. This
+ * might be a full form structure, or a sub-element of a larger form.
+ * - "field": The field structure.
+ * - "instance": The field instance structure.
+ * - "langcode": The language associated with $items.
+ * - "items": Array of default values for this field.
+ * - "delta": The order of this item in the array of subelements (0, 1, 2,
+ * etc).
+ *
+ * @see hook_field_widget_form()
+ * @see hook_field_widget_form_alter()
+ */
+function hook_field_widget_WIDGET_TYPE_form_alter(&$element, &$form_state, $context) {
+ // Code here will only act on widgets of type WIDGET_TYPE. For example,
+ // hook_field_widget_mymodule_autocomplete_form_alter() will only act on
+ // widgets of type 'mymodule_autocomplete'.
+ $element['#autocomplete_path'] = 'mymodule/autocomplete_path';
+}
+
+/**
+ * Alters the widget properties of a field instance before it gets displayed.
+ *
+ * Note that instead of hook_field_widget_properties_alter(), which is called
+ * for all fields on all entity types,
+ * hook_field_widget_properties_ENTITY_TYPE_alter() may be used to alter widget
+ * properties for fields on a specific entity type only.
+ *
+ * This hook is called once per field per added or edit entity. If the result
+ * of the hook involves reading from the database, it is highly recommended to
+ * statically cache the information.
+ *
+ * @param $widget
+ * The instance's widget properties.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The entity type; e.g., 'node' or 'user'.
+ * - entity: The entity object.
+ * - field: The field that the widget belongs to.
+ * - instance: The instance of the field.
+ *
+ * @see hook_field_widget_properties_ENTITY_TYPE_alter()
+ */
+function hook_field_widget_properties_alter(&$widget, $context) {
+ // Change a widget's type according to the time of day.
+ $field = $context['field'];
+ if ($context['entity_type'] == 'node' && $field['field_name'] == 'field_foo') {
+ $time = date('H');
+ $widget['type'] = $time < 12 ? 'widget_am' : 'widget_pm';
+ }
+}
+
+/**
+ * Flag a field-level validation error.
+ *
+ * @param $element
+ * An array containing the form element for the widget. The error needs to be
+ * flagged on the right sub-element, according to the widget's internal
+ * structure.
+ * @param $error
+ * An associative array with the following key-value pairs, as returned by
+ * hook_field_validate():
+ * - error: the error code. Complex widgets might need to report different
+ * errors to different form elements inside the widget.
+ * - message: the human readable message to be displayed.
+ * @param $form
+ * The form structure where field elements are attached to. This might be a
+ * full form structure, or a sub-element of a larger form.
+ * @param $form_state
+ * An associative array containing the current state of the form.
+ */
+function hook_field_widget_error($element, $error, $form, &$form_state) {
+ form_error($element, $error['message']);
+}
+
+
+/**
+ * @} End of "defgroup field_widget".
+ */
+
+
+/**
+ * @defgroup field_formatter Field Formatter API
+ * @{
+ * Define Field API formatter types.
+ *
+ * Field API formatters specify how fields are displayed when the entity to
+ * which the field is attached is displayed. Fields of a given
+ * @link field_types field type @endlink may be displayed using more than one
+ * formatter. In this case, the Field UI module allows the site builder to
+ * choose which formatter to use. Field formatters are defined by implementing
+ * hook_field_formatter_info().
+ *
+ * @see field
+ * @see field_types
+ * @see field_widget
+ */
+
+/**
+ * Expose Field API formatter types.
+ *
+ * Formatters handle the display of field values. Formatter hooks are typically
+ * called by the Field Attach API field_attach_prepare_view() and
+ * field_attach_view() functions.
+ *
+ * @return
+ * An array describing the formatter types implemented by the module.
+ * The keys are formatter type names. To avoid name clashes, formatter type
+ * names should be prefixed with the name of the module that exposes them.
+ * The values are arrays describing the formatter type, with the following
+ * key/value pairs:
+ * - label: The human-readable name of the formatter type.
+ * - description: A short description for the formatter type.
+ * - field types: An array of field types the formatter supports.
+ * - settings: An array whose keys are the names of the settings available
+ * for the formatter type, and whose values are the default values for
+ * those settings.
+ *
+ * @see hook_field_formatter_info_alter()
+ * @see hook_field_formatter_view()
+ * @see hook_field_formatter_prepare_view()
+ */
+function hook_field_formatter_info() {
+ return array(
+ 'text_default' => array(
+ 'label' => t('Default'),
+ 'field types' => array('text', 'text_long', 'text_with_summary'),
+ ),
+ 'text_plain' => array(
+ 'label' => t('Plain text'),
+ 'field types' => array('text', 'text_long', 'text_with_summary'),
+ ),
+
+ // The text_trimmed formatter displays the trimmed version of the
+ // full element of the field. It is intended to be used with text
+ // and text_long fields. It also works with text_with_summary
+ // fields though the text_summary_or_trimmed formatter makes more
+ // sense for that field type.
+ 'text_trimmed' => array(
+ 'label' => t('Trimmed'),
+ 'field types' => array('text', 'text_long', 'text_with_summary'),
+ ),
+
+ // The 'summary or trimmed' field formatter for text_with_summary
+ // fields displays returns the summary element of the field or, if
+ // the summary is empty, the trimmed version of the full element
+ // of the field.
+ 'text_summary_or_trimmed' => array(
+ 'label' => t('Summary or trimmed'),
+ 'field types' => array('text_with_summary'),
+ ),
+ );
+}
+
+/**
+ * Perform alterations on Field API formatter types.
+ *
+ * @param $info
+ * An array of information on formatter types exposed by
+ * hook_field_formatter_info() implementations.
+ */
+function hook_field_formatter_info_alter(&$info) {
+ // Add a setting to a formatter type.
+ $info['text_default']['settings'] += array(
+ 'mymodule_additional_setting' => 'default value',
+ );
+
+ // Let a new field type re-use an existing formatter.
+ $info['text_default']['field types'][] = 'my_field_type';
+}
+
+/**
+ * Allow formatters to load information for field values being displayed.
+ *
+ * This should be used when a formatter needs to load additional information
+ * from the database in order to render a field, for example a reference field
+ * which displays properties of the referenced entities such as name or type.
+ *
+ * This hook is called after the field type's own hook_field_prepare_view().
+ *
+ * Unlike most other field hooks, this hook operates on multiple entities. The
+ * $entities, $instances and $items parameters are arrays keyed by entity ID.
+ * For performance reasons, information for all available entities should be
+ * loaded in a single query where possible.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entities
+ * Array of entities being displayed, keyed by entity ID.
+ * @param $field
+ * The field structure for the operation.
+ * @param $instances
+ * Array of instance structures for $field for each entity, keyed by entity
+ * ID.
+ * @param $langcode
+ * The language the field values are to be shown in. If no language is
+ * provided the current language is used.
+ * @param $items
+ * Array of field values for the entities, keyed by entity ID.
+ * @param $displays
+ * Array of display settings to use for each entity, keyed by entity ID.
+ *
+ * @return
+ * Changes or additions to field values are done by altering the $items
+ * parameter by reference.
+ */
+function hook_field_formatter_prepare_view($entity_type, $entities, $field, $instances, $langcode, &$items, $displays) {
+ $tids = array();
+
+ // Collect every possible term attached to any of the fieldable entities.
+ foreach ($entities as $id => $entity) {
+ foreach ($items[$id] as $delta => $item) {
+ // Force the array key to prevent duplicates.
+ $tids[$item['tid']] = $item['tid'];
+ }
+ }
+
+ if ($tids) {
+ $terms = taxonomy_term_load_multiple($tids);
+
+ // Iterate through the fieldable entities again to attach the loaded term
+ // data.
+ foreach ($entities as $id => $entity) {
+ $rekey = FALSE;
+
+ foreach ($items[$id] as $delta => $item) {
+ // Check whether the taxonomy term field instance value could be loaded.
+ if (isset($terms[$item['tid']])) {
+ // Replace the instance value with the term data.
+ $items[$id][$delta]['taxonomy_term'] = $terms[$item['tid']];
+ }
+ // Otherwise, unset the instance value, since the term does not exist.
+ else {
+ unset($items[$id][$delta]);
+ $rekey = TRUE;
+ }
+ }
+
+ if ($rekey) {
+ // Rekey the items array.
+ $items[$id] = array_values($items[$id]);
+ }
+ }
+ }
+}
+
+/**
+ * Build a renderable array for a field value.
+ *
+ * @param $entity_type
+ * The type of $entity.
+ * @param $entity
+ * The entity being displayed.
+ * @param $field
+ * The field structure.
+ * @param $instance
+ * The field instance.
+ * @param $langcode
+ * The language associated with $items.
+ * @param $items
+ * Array of values for this field.
+ * @param $display
+ * The display settings to use, as found in the 'display' entry of instance
+ * definitions. The array notably contains the following keys and values;
+ * - type: The name of the formatter to use.
+ * - settings: The array of formatter settings.
+ *
+ * @return
+ * A renderable array for the $items, as an array of child elements keyed
+ * by numeric indexes starting from 0.
+ */
+function hook_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
+ $element = array();
+ $settings = $display['settings'];
+
+ switch ($display['type']) {
+ case 'sample_field_formatter_simple':
+ // Common case: each value is displayed individually in a sub-element
+ // keyed by delta. The field.tpl.php template specifies the markup
+ // wrapping each value.
+ foreach ($items as $delta => $item) {
+ $element[$delta] = array('#markup' => $settings['some_setting'] . $item['value']);
+ }
+ break;
+
+ case 'sample_field_formatter_themeable':
+ // More elaborate formatters can defer to a theme function for easier
+ // customization.
+ foreach ($items as $delta => $item) {
+ $element[$delta] = array(
+ '#theme' => 'mymodule_theme_sample_field_formatter_themeable',
+ '#data' => $item['value'],
+ '#some_setting' => $settings['some_setting'],
+ );
+ }
+ break;
+
+ case 'sample_field_formatter_combined':
+ // Some formatters might need to display all values within a single piece
+ // of markup.
+ $rows = array();
+ foreach ($items as $delta => $item) {
+ $rows[] = array($delta, $item['value']);
+ }
+ $element[0] = array(
+ '#theme' => 'table',
+ '#header' => array(t('Delta'), t('Value')),
+ '#rows' => $rows,
+ );
+ break;
+ }
+
+ return $element;
+}
+
+/**
+ * @} End of "defgroup field_formatter".
+ */
+
+/**
+ * @ingroup field_attach
+ * @{
+ */
+
+/**
+ * Act on field_attach_form().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ * Implementing modules should alter the $form or $form_state parameters.
+ *
+ * @param $entity_type
+ * The type of $entity; for example, 'node' or 'user'.
+ * @param $entity
+ * The entity for which an edit form is being built.
+ * @param $form
+ * The form structure where field elements are attached to. This might be a
+ * full form structure, or a sub-element of a larger form. The
+ * $form['#parents'] property can be used to identify the corresponding part
+ * of $form_state['values']. Hook implementations that need to act on the
+ * top-level properties of the global form (like #submit, #validate...) can
+ * add a #process callback to the array received in the $form parameter, and
+ * act on the $complete_form parameter in the process callback.
+ * @param $form_state
+ * An associative array containing the current state of the form.
+ * @param $langcode
+ * The language the field values are going to be entered in. If no language
+ * is provided the default site language will be used.
+ */
+function hook_field_attach_form($entity_type, $entity, &$form, &$form_state, $langcode) {
+ // Add a checkbox allowing a given field to be emptied.
+ // See hook_field_attach_submit() for the corresponding processing code.
+ $form['empty_field_foo'] = array(
+ '#type' => 'checkbox',
+ '#title' => t("Empty the 'field_foo' field"),
+ );
+}
+
+/**
+ * Act on field_attach_load().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * Unlike other field_attach hooks, this hook accounts for 'multiple loads'.
+ * Instead of the usual $entity parameter, it accepts an array of entities,
+ * indexed by entity ID. For performance reasons, information for all available
+ * entities should be loaded in a single query where possible.
+ *
+ * The changes made to the entities' field values get cached by the field cache
+ * for subsequent loads.
+ *
+ * See field_attach_load() for details and arguments.
+ */
+function hook_field_attach_load($entity_type, $entities, $age, $options) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on field_attach_validate().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * See field_attach_validate() for details and arguments.
+ */
+function hook_field_attach_validate($entity_type, $entity, &$errors) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on field_attach_submit().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * @param $entity_type
+ * The type of $entity; for example, 'node' or 'user'.
+ * @param $entity
+ * The entity for which an edit form is being submitted. The incoming form
+ * values have been extracted as field values of the $entity object.
+ * @param $form
+ * The form structure where field elements are attached to. This might be a
+ * full form structure, or a sub-part of a larger form. The $form['#parents']
+ * property can be used to identify the corresponding part of
+ * $form_state['values'].
+ * @param $form_state
+ * An associative array containing the current state of the form.
+ */
+function hook_field_attach_submit($entity_type, $entity, $form, &$form_state) {
+ // Sample case of an 'Empty the field' checkbox added on the form, allowing
+ // a given field to be emptied.
+ $values = drupal_array_get_nested_value($form_state['values'], $form['#parents']);
+ if (!empty($values['empty_field_foo'])) {
+ unset($entity->field_foo);
+ }
+}
+
+/**
+ * Act on field_attach_presave().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * See field_attach_presave() for details and arguments.
+ */
+function hook_field_attach_presave($entity_type, $entity) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on field_attach_insert().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * See field_attach_insert() for details and arguments.
+ */
+function hook_field_attach_insert($entity_type, $entity) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on field_attach_update().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * See field_attach_update() for details and arguments.
+ */
+function hook_field_attach_update($entity_type, $entity) {
+ // @todo Needs function body.
+}
+
+/**
+ * Alter field_attach_preprocess() variables.
+ *
+ * This hook is invoked while preprocessing the field.tpl.php template file
+ * in field_attach_preprocess().
+ *
+ * @param $variables
+ * The variables array is passed by reference and will be populated with field
+ * values.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The type of $entity; for example, 'node' or 'user'.
+ * - entity: The entity with fields to render.
+ * - element: The structured array containing the values ready for rendering.
+ */
+function hook_field_attach_preprocess_alter(&$variables, $context) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on field_attach_delete().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * See field_attach_delete() for details and arguments.
+ */
+function hook_field_attach_delete($entity_type, $entity) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on field_attach_delete_revision().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * See field_attach_delete_revision() for details and arguments.
+ */
+function hook_field_attach_delete_revision($entity_type, $entity) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on field_purge_data().
+ *
+ * This hook is invoked in field_purge_data() and allows modules to act on
+ * purging data from a single field pseudo-entity. For example, if a module
+ * relates data in the field with its own data, it may purge its own data
+ * during this process as well.
+ *
+ * @param $entity_type
+ * The type of $entity; for example, 'node' or 'user'.
+ * @param $entity
+ * The pseudo-entity whose field data is being purged.
+ * @param $field
+ * The (possibly deleted) field whose data is being purged.
+ * @param $instance
+ * The deleted field instance whose data is being purged.
+ *
+ * @see @link field_purge Field API bulk data deletion @endlink
+ * @see field_purge_data()
+ */
+function hook_field_attach_purge($entity_type, $entity, $field, $instance) {
+ // find the corresponding data in mymodule and purge it
+ if ($entity_type == 'node' && $field->field_name == 'my_field_name') {
+ mymodule_remove_mydata($entity->nid);
+ }
+}
+
+/**
+ * Perform alterations on field_attach_view() or field_view_field().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * @param $output
+ * The structured content array tree for all of the entity's fields.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The type of $entity; for example, 'node' or 'user'.
+ * - entity: The entity with fields to render.
+ * - view_mode: View mode; for example, 'full' or 'teaser'.
+ * - display: Either a view mode string or an array of display settings. If
+ * this hook is being invoked from field_attach_view(), the 'display'
+ * element is set to the view mode string. If this hook is being invoked
+ * from field_view_field(), this element is set to the $display argument
+ * and the view_mode element is set to '_custom'. See field_view_field()
+ * for more information on what its $display argument contains.
+ * - language: The language code used for rendering.
+ */
+function hook_field_attach_view_alter(&$output, $context) {
+ // Append RDF term mappings on displayed taxonomy links.
+ foreach (element_children($output) as $field_name) {
+ $element = &$output[$field_name];
+ if ($element['#field_type'] == 'taxonomy_term_reference' && $element['#formatter'] == 'taxonomy_term_reference_link') {
+ foreach ($element['#items'] as $delta => $item) {
+ $term = $item['taxonomy_term'];
+ if (!empty($term->rdf_mapping['rdftype'])) {
+ $element[$delta]['#options']['attributes']['typeof'] = $term->rdf_mapping['rdftype'];
+ }
+ if (!empty($term->rdf_mapping['name']['predicates'])) {
+ $element[$delta]['#options']['attributes']['property'] = $term->rdf_mapping['name']['predicates'];
+ }
+ }
+ }
+ }
+}
+
+/**
+ * Perform alterations on field_attach_prepare_translation().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * @param $entity
+ * The entity being prepared for translation.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The type of $entity; e.g. 'node' or 'user'.
+ * - langcode: The language the entity has to be translated in.
+ * - source_entity: The entity holding the field values to be translated.
+ * - source_langcode: The source language from which translate.
+ */
+function hook_field_attach_prepare_translation_alter(&$entity, $context) {
+ if ($context['entity_type'] == 'custom_entity_type') {
+ $entity->custom_field = $context['source_entity']->custom_field;
+ }
+}
+
+/**
+ * Perform alterations on field_language() values.
+ *
+ * This hook is invoked to alter the array of display languages for the given
+ * entity.
+ *
+ * @param $display_language
+ * A reference to an array of language codes keyed by field name.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The type of the entity to be displayed.
+ * - entity: The entity with fields to render.
+ * - langcode: The language code $entity has to be displayed in.
+ */
+function hook_field_language_alter(&$display_language, $context) {
+ // Do not apply core language fallback rules if they are disabled or if Locale
+ // is not registered as a translation handler.
+ if (variable_get('locale_field_language_fallback', TRUE) && field_has_translation_handler($context['entity_type'], 'locale')) {
+ locale_field_language_fallback($display_language, $context['entity'], $context['language']);
+ }
+}
+
+/**
+ * Alter field_available_languages() values.
+ *
+ * This hook is invoked from field_available_languages() to allow modules to
+ * alter the array of available languages for the given field.
+ *
+ * @param $languages
+ * A reference to an array of language codes to be made available.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The type of the entity the field is attached to.
+ * - field: A field data structure.
+ */
+function hook_field_available_languages_alter(&$languages, $context) {
+ // Add an unavailable language.
+ $languages[] = 'xx';
+
+ // Remove an available language.
+ $index = array_search('yy', $languages);
+ unset($languages[$index]);
+}
+
+/**
+ * Act on field_attach_create_bundle().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * See field_attach_create_bundle() for details and arguments.
+ */
+function hook_field_attach_create_bundle($entity_type, $bundle) {
+ // When a new bundle is created, the menu needs to be rebuilt to add the
+ // Field UI menu item tabs.
+ variable_set('menu_rebuild_needed', TRUE);
+}
+
+/**
+ * Act on field_attach_rename_bundle().
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * See field_attach_rename_bundle() for details and arguments.
+ */
+function hook_field_attach_rename_bundle($entity_type, $bundle_old, $bundle_new) {
+ // Update the extra weights variable with new information.
+ if ($bundle_old !== $bundle_new) {
+ $extra_weights = variable_get('field_extra_weights', array());
+ if (isset($info[$entity_type][$bundle_old])) {
+ $extra_weights[$entity_type][$bundle_new] = $extra_weights[$entity_type][$bundle_old];
+ unset($extra_weights[$entity_type][$bundle_old]);
+ variable_set('field_extra_weights', $extra_weights);
+ }
+ }
+}
+
+/**
+ * Act on field_attach_delete_bundle.
+ *
+ * This hook is invoked after the field module has performed the operation.
+ *
+ * @param $entity_type
+ * The type of entity; for example, 'node' or 'user'.
+ * @param $bundle
+ * The bundle that was just deleted.
+ * @param $instances
+ * An array of all instances that existed for the bundle before it was
+ * deleted.
+ */
+function hook_field_attach_delete_bundle($entity_type, $bundle, $instances) {
+ // Remove the extra weights variable information for this bundle.
+ $extra_weights = variable_get('field_extra_weights', array());
+ if (isset($extra_weights[$entity_type][$bundle])) {
+ unset($extra_weights[$entity_type][$bundle]);
+ variable_set('field_extra_weights', $extra_weights);
+ }
+}
+
+/**
+ * @} End of "defgroup field_attach".
+ */
+
+/**
+ * @addtogroup field_storage
+ * @{
+ */
+
+/**
+ * Expose Field API storage backends.
+ *
+ * @return
+ * An array describing the storage backends implemented by the module.
+ * The keys are storage backend names. To avoid name clashes, storage backend
+ * names should be prefixed with the name of the module that exposes them.
+ * The values are arrays describing the storage backend, with the following
+ * key/value pairs:
+ * - label: The human-readable name of the storage backend.
+ * - description: A short description for the storage backend.
+ * - settings: An array whose keys are the names of the settings available
+ * for the storage backend, and whose values are the default values for
+ * those settings.
+ */
+function hook_field_storage_info() {
+ return array(
+ 'field_sql_storage' => array(
+ 'label' => t('Default SQL storage'),
+ 'description' => t('Stores fields in the local SQL database, using per-field tables.'),
+ 'settings' => array(),
+ ),
+ );
+}
+
+/**
+ * Perform alterations on Field API storage types.
+ *
+ * @param $info
+ * Array of informations on storage types exposed by
+ * hook_field_field_storage_info() implementations.
+ */
+function hook_field_storage_info_alter(&$info) {
+ // Add a setting to a storage type.
+ $info['field_sql_storage']['settings'] += array(
+ 'mymodule_additional_setting' => 'default value',
+ );
+}
+
+/**
+ * Reveal the internal details about the storage for a field.
+ *
+ * For example, an SQL storage module might return the Schema API structure for
+ * the table. A key/value storage module might return the server name,
+ * authentication credentials, and bin name.
+ *
+ * Field storage modules are not obligated to implement this hook. Modules
+ * that rely on these details must only use them for read operations.
+ *
+ * @param $field
+ * A field structure.
+ *
+ * @return
+ * An array of details.
+ * - The first dimension is a store type (sql, solr, etc).
+ * - The second dimension indicates the age of the values in the store
+ * FIELD_LOAD_CURRENT or FIELD_LOAD_REVISION.
+ * - Other dimensions are specific to the field storage module.
+ *
+ * @see hook_field_storage_details_alter()
+ */
+function hook_field_storage_details($field) {
+ $details = array();
+
+ // Add field columns.
+ foreach ((array) $field['columns'] as $column_name => $attributes) {
+ $real_name = _field_sql_storage_columnname($field['field_name'], $column_name);
+ $columns[$column_name] = $real_name;
+ }
+ return array(
+ 'sql' => array(
+ FIELD_LOAD_CURRENT => array(
+ _field_sql_storage_tablename($field) => $columns,
+ ),
+ FIELD_LOAD_REVISION => array(
+ _field_sql_storage_revision_tablename($field) => $columns,
+ ),
+ ),
+ );
+}
+
+/**
+ * Perform alterations on Field API storage details.
+ *
+ * @param $details
+ * An array of storage details for fields as exposed by
+ * hook_field_storage_details() implementations.
+ * @param $field
+ * A field structure.
+ *
+ * @see hook_field_storage_details()
+ */
+function hook_field_storage_details_alter(&$details, $field) {
+ if ($field['field_name'] == 'field_of_interest') {
+ $columns = array();
+ foreach ((array) $field['columns'] as $column_name => $attributes) {
+ $columns[$column_name] = $column_name;
+ }
+ $details['drupal_variables'] = array(
+ FIELD_LOAD_CURRENT => array(
+ 'moon' => $columns,
+ ),
+ FIELD_LOAD_REVISION => array(
+ 'mars' => $columns,
+ ),
+ );
+ }
+}
+
+/**
+ * Load field data for a set of entities.
+ *
+ * This hook is invoked from field_attach_load() to ask the field storage
+ * module to load field data.
+ *
+ * Modules implementing this hook should load field values and add them to
+ * objects in $entities. Fields with no values should be added as empty
+ * arrays.
+ *
+ * @param $entity_type
+ * The type of entity, such as 'node' or 'user'.
+ * @param $entities
+ * The array of entity objects to add fields to, keyed by entity ID.
+ * @param $age
+ * FIELD_LOAD_CURRENT to load the most recent revision for all fields, or
+ * FIELD_LOAD_REVISION to load the version indicated by each entity.
+ * @param $fields
+ * An array listing the fields to be loaded. The keys of the array are field
+ * IDs, and the values of the array are the entity IDs (or revision IDs,
+ * depending on the $age parameter) to add each field to.
+ * @param $options
+ * An associative array of additional options, with the following keys:
+ * - deleted: If TRUE, deleted fields should be loaded as well as
+ * non-deleted fields. If unset or FALSE, only non-deleted fields should be
+ * loaded.
+ */
+function hook_field_storage_load($entity_type, $entities, $age, $fields, $options) {
+ $load_current = $age == FIELD_LOAD_CURRENT;
+
+ foreach ($fields as $field_id => $ids) {
+ // By the time this hook runs, the relevant field definitions have been
+ // populated and cached in FieldInfo, so calling field_info_field_by_id()
+ // on each field individually is more efficient than loading all fields in
+ // memory upfront with field_info_field_by_ids().
+ $field = field_info_field_by_id($field_id);
+ $field_name = $field['field_name'];
+ $table = $load_current ? _field_sql_storage_tablename($field) : _field_sql_storage_revision_tablename($field);
+
+ $query = db_select($table, 't')
+ ->fields('t')
+ ->condition('entity_type', $entity_type)
+ ->condition($load_current ? 'entity_id' : 'revision_id', $ids, 'IN')
+ ->condition('language', field_available_languages($entity_type, $field), 'IN')
+ ->orderBy('delta');
+
+ if (empty($options['deleted'])) {
+ $query->condition('deleted', 0);
+ }
+
+ $results = $query->execute();
+
+ $delta_count = array();
+ foreach ($results as $row) {
+ if (!isset($delta_count[$row->entity_id][$row->language])) {
+ $delta_count[$row->entity_id][$row->language] = 0;
+ }
+
+ if ($field['cardinality'] == FIELD_CARDINALITY_UNLIMITED || $delta_count[$row->entity_id][$row->language] < $field['cardinality']) {
+ $item = array();
+ // For each column declared by the field, populate the item
+ // from the prefixed database column.
+ foreach ($field['columns'] as $column => $attributes) {
+ $column_name = _field_sql_storage_columnname($field_name, $column);
+ $item[$column] = $row->$column_name;
+ }
+
+ // Add the item to the field values for the entity.
+ $entities[$row->entity_id]->{$field_name}[$row->language][] = $item;
+ $delta_count[$row->entity_id][$row->language]++;
+ }
+ }
+ }
+}
+
+/**
+ * Write field data for an entity.
+ *
+ * This hook is invoked from field_attach_insert() and field_attach_update(),
+ * to ask the field storage module to save field data.
+ *
+ * @param $entity_type
+ * The entity type of entity, such as 'node' or 'user'.
+ * @param $entity
+ * The entity on which to operate.
+ * @param $op
+ * FIELD_STORAGE_UPDATE when updating an existing entity,
+ * FIELD_STORAGE_INSERT when inserting a new entity.
+ * @param $fields
+ * An array listing the fields to be written. The keys and values of the
+ * array are field IDs.
+ */
+function hook_field_storage_write($entity_type, $entity, $op, $fields) {
+ list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
+ if (!isset($vid)) {
+ $vid = $id;
+ }
+
+ foreach ($fields as $field_id) {
+ $field = field_info_field_by_id($field_id);
+ $field_name = $field['field_name'];
+ $table_name = _field_sql_storage_tablename($field);
+ $revision_name = _field_sql_storage_revision_tablename($field);
+
+ $all_languages = field_available_languages($entity_type, $field);
+ $field_languages = array_intersect($all_languages, array_keys((array) $entity->$field_name));
+
+ // Delete and insert, rather than update, in case a value was added.
+ if ($op == FIELD_STORAGE_UPDATE) {
+ // Delete languages present in the incoming $entity->$field_name.
+ // Delete all languages if $entity->$field_name is empty.
+ $languages = !empty($entity->$field_name) ? $field_languages : $all_languages;
+ if ($languages) {
+ db_delete($table_name)
+ ->condition('entity_type', $entity_type)
+ ->condition('entity_id', $id)
+ ->condition('language', $languages, 'IN')
+ ->execute();
+ db_delete($revision_name)
+ ->condition('entity_type', $entity_type)
+ ->condition('entity_id', $id)
+ ->condition('revision_id', $vid)
+ ->condition('language', $languages, 'IN')
+ ->execute();
+ }
+ }
+
+ // Prepare the multi-insert query.
+ $do_insert = FALSE;
+ $columns = array('entity_type', 'entity_id', 'revision_id', 'bundle', 'delta', 'language');
+ foreach ($field['columns'] as $column => $attributes) {
+ $columns[] = _field_sql_storage_columnname($field_name, $column);
+ }
+ $query = db_insert($table_name)->fields($columns);
+ $revision_query = db_insert($revision_name)->fields($columns);
+
+ foreach ($field_languages as $langcode) {
+ $items = (array) $entity->{$field_name}[$langcode];
+ $delta_count = 0;
+ foreach ($items as $delta => $item) {
+ // We now know we have someting to insert.
+ $do_insert = TRUE;
+ $record = array(
+ 'entity_type' => $entity_type,
+ 'entity_id' => $id,
+ 'revision_id' => $vid,
+ 'bundle' => $bundle,
+ 'delta' => $delta,
+ 'language' => $langcode,
+ );
+ foreach ($field['columns'] as $column => $attributes) {
+ $record[_field_sql_storage_columnname($field_name, $column)] = isset($item[$column]) ? $item[$column] : NULL;
+ }
+ $query->values($record);
+ if (isset($vid)) {
+ $revision_query->values($record);
+ }
+
+ if ($field['cardinality'] != FIELD_CARDINALITY_UNLIMITED && ++$delta_count == $field['cardinality']) {
+ break;
+ }
+ }
+ }
+
+ // Execute the query if we have values to insert.
+ if ($do_insert) {
+ $query->execute();
+ $revision_query->execute();
+ }
+ }
+}
+
+/**
+ * Delete all field data for an entity.
+ *
+ * This hook is invoked from field_attach_delete() to ask the field storage
+ * module to delete field data.
+ *
+ * @param $entity_type
+ * The entity type of entity, such as 'node' or 'user'.
+ * @param $entity
+ * The entity on which to operate.
+ * @param $fields
+ * An array listing the fields to delete. The keys and values of the
+ * array are field IDs.
+ */
+function hook_field_storage_delete($entity_type, $entity, $fields) {
+ list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
+
+ foreach (field_info_instances($entity_type, $bundle) as $instance) {
+ if (isset($fields[$instance['field_id']])) {
+ $field = field_info_field_by_id($instance['field_id']);
+ field_sql_storage_field_storage_purge($entity_type, $entity, $field, $instance);
+ }
+ }
+}
+
+/**
+ * Delete a single revision of field data for an entity.
+ *
+ * This hook is invoked from field_attach_delete_revision() to ask the field
+ * storage module to delete field revision data.
+ *
+ * Deleting the current (most recently written) revision is not
+ * allowed as has undefined results.
+ *
+ * @param $entity_type
+ * The entity type of entity, such as 'node' or 'user'.
+ * @param $entity
+ * The entity on which to operate. The revision to delete is
+ * indicated by the entity's revision ID property, as identified by
+ * hook_fieldable_info() for $entity_type.
+ * @param $fields
+ * An array listing the fields to delete. The keys and values of the
+ * array are field IDs.
+ */
+function hook_field_storage_delete_revision($entity_type, $entity, $fields) {
+ list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
+
+ if (isset($vid)) {
+ foreach ($fields as $field_id) {
+ $field = field_info_field_by_id($field_id);
+ $revision_name = _field_sql_storage_revision_tablename($field);
+ db_delete($revision_name)
+ ->condition('entity_type', $entity_type)
+ ->condition('entity_id', $id)
+ ->condition('revision_id', $vid)
+ ->execute();
+ }
+ }
+}
+
+/**
+ * Execute an EntityFieldQuery.
+ *
+ * This hook is called to find the entities having certain entity and field
+ * conditions and sort them in the given field order. If the field storage
+ * engine also handles property sorts and orders, it should unset those
+ * properties in the called object to signal that those have been handled.
+ *
+ * @param EntityFieldQuery $query
+ * An EntityFieldQuery.
+ *
+ * @return
+ * See EntityFieldQuery::execute() for the return values.
+ */
+function hook_field_storage_query($query) {
+ $groups = array();
+ if ($query->age == FIELD_LOAD_CURRENT) {
+ $tablename_function = '_field_sql_storage_tablename';
+ $id_key = 'entity_id';
+ }
+ else {
+ $tablename_function = '_field_sql_storage_revision_tablename';
+ $id_key = 'revision_id';
+ }
+ $table_aliases = array();
+ // Add tables for the fields used.
+ foreach ($query->fields as $key => $field) {
+ $tablename = $tablename_function($field);
+ // Every field needs a new table.
+ $table_alias = $tablename . $key;
+ $table_aliases[$key] = $table_alias;
+ if ($key) {
+ $select_query->join($tablename, $table_alias, "$table_alias.entity_type = $field_base_table.entity_type AND $table_alias.$id_key = $field_base_table.$id_key");
+ }
+ else {
+ $select_query = db_select($tablename, $table_alias);
+ $select_query->addTag('entity_field_access');
+ $select_query->addMetaData('base_table', $tablename);
+ $select_query->fields($table_alias, array('entity_type', 'entity_id', 'revision_id', 'bundle'));
+ $field_base_table = $table_alias;
+ }
+ if ($field['cardinality'] != 1) {
+ $select_query->distinct();
+ }
+ }
+
+ // Add field conditions.
+ foreach ($query->fieldConditions as $key => $condition) {
+ $table_alias = $table_aliases[$key];
+ $field = $condition['field'];
+ // Add the specified condition.
+ $sql_field = "$table_alias." . _field_sql_storage_columnname($field['field_name'], $condition['column']);
+ $query->addCondition($select_query, $sql_field, $condition);
+ // Add delta / language group conditions.
+ foreach (array('delta', 'language') as $column) {
+ if (isset($condition[$column . '_group'])) {
+ $group_name = $condition[$column . '_group'];
+ if (!isset($groups[$column][$group_name])) {
+ $groups[$column][$group_name] = $table_alias;
+ }
+ else {
+ $select_query->where("$table_alias.$column = " . $groups[$column][$group_name] . ".$column");
+ }
+ }
+ }
+ }
+
+ if (isset($query->deleted)) {
+ $select_query->condition("$field_base_table.deleted", (int) $query->deleted);
+ }
+
+ // Is there a need to sort the query by property?
+ $has_property_order = FALSE;
+ foreach ($query->order as $order) {
+ if ($order['type'] == 'property') {
+ $has_property_order = TRUE;
+ }
+ }
+
+ if ($query->propertyConditions || $has_property_order) {
+ if (empty($query->entityConditions['entity_type']['value'])) {
+ throw new EntityFieldQueryException('Property conditions and orders must have an entity type defined.');
+ }
+ $entity_type = $query->entityConditions['entity_type']['value'];
+ $entity_base_table = _field_sql_storage_query_join_entity($select_query, $entity_type, $field_base_table);
+ $query->entityConditions['entity_type']['operator'] = '=';
+ foreach ($query->propertyConditions as $property_condition) {
+ $query->addCondition($select_query, "$entity_base_table." . $property_condition['column'], $property_condition);
+ }
+ }
+ foreach ($query->entityConditions as $key => $condition) {
+ $query->addCondition($select_query, "$field_base_table.$key", $condition);
+ }
+
+ // Order the query.
+ foreach ($query->order as $order) {
+ if ($order['type'] == 'entity') {
+ $key = $order['specifier'];
+ $select_query->orderBy("$field_base_table.$key", $order['direction']);
+ }
+ elseif ($order['type'] == 'field') {
+ $specifier = $order['specifier'];
+ $field = $specifier['field'];
+ $table_alias = $table_aliases[$specifier['index']];
+ $sql_field = "$table_alias." . _field_sql_storage_columnname($field['field_name'], $specifier['column']);
+ $select_query->orderBy($sql_field, $order['direction']);
+ }
+ elseif ($order['type'] == 'property') {
+ $select_query->orderBy("$entity_base_table." . $order['specifier'], $order['direction']);
+ }
+ }
+
+ return $query->finishQuery($select_query, $id_key);
+}
+
+/**
+ * Act on creation of a new field.
+ *
+ * This hook is invoked from field_create_field() to ask the field storage
+ * module to save field information and prepare for storing field instances.
+ * If there is a problem, the field storage module should throw an exception.
+ *
+ * @param $field
+ * The field structure being created.
+ */
+function hook_field_storage_create_field($field) {
+ $schema = _field_sql_storage_schema($field);
+ foreach ($schema as $name => $table) {
+ db_create_table($name, $table);
+ }
+ drupal_get_schema(NULL, TRUE);
+}
+
+/**
+ * Act on deletion of a field.
+ *
+ * This hook is invoked from field_delete_field() to ask the field storage
+ * module to mark all information stored in the field for deletion.
+ *
+ * @param $field
+ * The field being deleted.
+ */
+function hook_field_storage_delete_field($field) {
+ // Mark all data associated with the field for deletion.
+ $field['deleted'] = 0;
+ $table = _field_sql_storage_tablename($field);
+ $revision_table = _field_sql_storage_revision_tablename($field);
+ db_update($table)
+ ->fields(array('deleted' => 1))
+ ->execute();
+
+ // Move the table to a unique name while the table contents are being deleted.
+ $field['deleted'] = 1;
+ $new_table = _field_sql_storage_tablename($field);
+ $revision_new_table = _field_sql_storage_revision_tablename($field);
+ db_rename_table($table, $new_table);
+ db_rename_table($revision_table, $revision_new_table);
+ drupal_get_schema(NULL, TRUE);
+}
+
+/**
+ * Act on deletion of a field instance.
+ *
+ * This hook is invoked from field_delete_instance() to ask the field storage
+ * module to mark all information stored for the field instance for deletion.
+ *
+ * @param $instance
+ * The instance being deleted.
+ */
+function hook_field_storage_delete_instance($instance) {
+ $field = field_info_field($instance['field_name']);
+ $table_name = _field_sql_storage_tablename($field);
+ $revision_name = _field_sql_storage_revision_tablename($field);
+ db_update($table_name)
+ ->fields(array('deleted' => 1))
+ ->condition('entity_type', $instance['entity_type'])
+ ->condition('bundle', $instance['bundle'])
+ ->execute();
+ db_update($revision_name)
+ ->fields(array('deleted' => 1))
+ ->condition('entity_type', $instance['entity_type'])
+ ->condition('bundle', $instance['bundle'])
+ ->execute();
+}
+
+/**
+ * Act before the storage backends load field data.
+ *
+ * This hook allows modules to load data before the Field Storage API,
+ * optionally preventing the field storage module from doing so.
+ *
+ * This lets 3rd party modules override, mirror, shard, or otherwise store a
+ * subset of fields in a different way than the current storage engine.
+ * Possible use cases include per-bundle storage, per-combo-field storage, etc.
+ *
+ * Modules implementing this hook should load field values and add them to
+ * objects in $entities. Fields with no values should be added as empty
+ * arrays. In addition, fields loaded should be added as keys to $skip_fields.
+ *
+ * @param $entity_type
+ * The type of entity, such as 'node' or 'user'.
+ * @param $entities
+ * The array of entity objects to add fields to, keyed by entity ID.
+ * @param $age
+ * FIELD_LOAD_CURRENT to load the most recent revision for all fields, or
+ * FIELD_LOAD_REVISION to load the version indicated by each entity.
+ * @param $skip_fields
+ * An array keyed by field IDs whose data has already been loaded and
+ * therefore should not be loaded again. Add a key to this array to indicate
+ * that your module has already loaded a field.
+ * @param $options
+ * An associative array of additional options, with the following keys:
+ * - field_id: The field ID that should be loaded. If unset, all fields
+ * should be loaded.
+ * - deleted: If TRUE, deleted fields should be loaded as well as
+ * non-deleted fields. If unset or FALSE, only non-deleted fields should be
+ * loaded.
+ */
+function hook_field_storage_pre_load($entity_type, $entities, $age, &$skip_fields, $options) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act before the storage backends insert field data.
+ *
+ * This hook allows modules to store data before the Field Storage API,
+ * optionally preventing the field storage module from doing so.
+ *
+ * @param $entity_type
+ * The type of $entity; for example, 'node' or 'user'.
+ * @param $entity
+ * The entity with fields to save.
+ * @param $skip_fields
+ * An array keyed by field IDs whose data has already been written and
+ * therefore should not be written again. The values associated with these
+ * keys are not specified.
+ * @return
+ * Saved field IDs are set set as keys in $skip_fields.
+ */
+function hook_field_storage_pre_insert($entity_type, $entity, &$skip_fields) {
+ if ($entity_type == 'node' && $entity->status && _forum_node_check_node_type($entity)) {
+ $query = db_insert('forum_index')->fields(array('nid', 'title', 'tid', 'sticky', 'created', 'comment_count', 'last_comment_timestamp'));
+ foreach ($entity->taxonomy_forums as $language) {
+ foreach ($language as $delta) {
+ $query->values(array(
+ 'nid' => $entity->nid,
+ 'title' => $entity->title,
+ 'tid' => $delta['value'],
+ 'sticky' => $entity->sticky,
+ 'created' => $entity->created,
+ 'comment_count' => 0,
+ 'last_comment_timestamp' => $entity->created,
+ ));
+ }
+ }
+ $query->execute();
+ }
+}
+
+/**
+ * Act before the storage backends update field data.
+ *
+ * This hook allows modules to store data before the Field Storage API,
+ * optionally preventing the field storage module from doing so.
+ *
+ * @param $entity_type
+ * The type of $entity; for example, 'node' or 'user'.
+ * @param $entity
+ * The entity with fields to save.
+ * @param $skip_fields
+ * An array keyed by field IDs whose data has already been written and
+ * therefore should not be written again. The values associated with these
+ * keys are not specified.
+ * @return
+ * Saved field IDs are set set as keys in $skip_fields.
+ */
+function hook_field_storage_pre_update($entity_type, $entity, &$skip_fields) {
+ $first_call = &drupal_static(__FUNCTION__, array());
+
+ if ($entity_type == 'node' && $entity->status && _forum_node_check_node_type($entity)) {
+ // We don't maintain data for old revisions, so clear all previous values
+ // from the table. Since this hook runs once per field, per entity, make
+ // sure we only wipe values once.
+ if (!isset($first_call[$entity->nid])) {
+ $first_call[$entity->nid] = FALSE;
+ db_delete('forum_index')->condition('nid', $entity->nid)->execute();
+ }
+ // Only save data to the table if the node is published.
+ if ($entity->status) {
+ $query = db_insert('forum_index')->fields(array('nid', 'title', 'tid', 'sticky', 'created', 'comment_count', 'last_comment_timestamp'));
+ foreach ($entity->taxonomy_forums as $language) {
+ foreach ($language as $delta) {
+ $query->values(array(
+ 'nid' => $entity->nid,
+ 'title' => $entity->title,
+ 'tid' => $delta['value'],
+ 'sticky' => $entity->sticky,
+ 'created' => $entity->created,
+ 'comment_count' => 0,
+ 'last_comment_timestamp' => $entity->created,
+ ));
+ }
+ }
+ $query->execute();
+ // The logic for determining last_comment_count is fairly complex, so
+ // call _forum_update_forum_index() too.
+ _forum_update_forum_index($entity->nid);
+ }
+ }
+}
+
+/**
+ * Returns the maximum weight for the entity components handled by the module.
+ *
+ * Field API takes care of fields and 'extra_fields'. This hook is intended for
+ * third-party modules adding other entity components (e.g. field_group).
+ *
+ * @param $entity_type
+ * The type of entity; e.g. 'node' or 'user'.
+ * @param $bundle
+ * The bundle name.
+ * @param $context
+ * The context for which the maximum weight is requested. Either 'form', or
+ * the name of a view mode.
+ * @return
+ * The maximum weight of the entity's components, or NULL if no components
+ * were found.
+ */
+function hook_field_info_max_weight($entity_type, $bundle, $context) {
+ $weights = array();
+
+ foreach (my_module_entity_additions($entity_type, $bundle, $context) as $addition) {
+ $weights[] = $addition['weight'];
+ }
+
+ return $weights ? max($weights) : NULL;
+}
+
+/**
+ * Alters the display settings of a field before it gets displayed.
+ *
+ * Note that instead of hook_field_display_alter(), which is called for all
+ * fields on all entity types, hook_field_display_ENTITY_TYPE_alter() may be
+ * used to alter display settings for fields on a specific entity type only.
+ *
+ * This hook is called once per field per displayed entity. If the result of the
+ * hook involves reading from the database, it is highly recommended to
+ * statically cache the information.
+ *
+ * @param $display
+ * The display settings that will be used to display the field values, as
+ * found in the 'display' key of $instance definitions.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The entity type; e.g., 'node' or 'user'.
+ * - field: The field being rendered.
+ * - instance: The instance being rendered.
+ * - entity: The entity being rendered.
+ * - view_mode: The view mode, e.g. 'full', 'teaser'...
+ *
+ * @see hook_field_display_ENTITY_TYPE_alter()
+ */
+function hook_field_display_alter(&$display, $context) {
+ // Leave field labels out of the search index.
+ // Note: The check against $context['entity_type'] == 'node' could be avoided
+ // by using hook_field_display_node_alter() instead of
+ // hook_field_display_alter(), resulting in less function calls when
+ // rendering non-node entities.
+ if ($context['entity_type'] == 'node' && $context['view_mode'] == 'search_index') {
+ $display['label'] = 'hidden';
+ }
+}
+
+/**
+ * Alters the display settings of a field on a given entity type before it gets displayed.
+ *
+ * Modules can implement hook_field_display_ENTITY_TYPE_alter() to alter display
+ * settings for fields on a specific entity type, rather than implementing
+ * hook_field_display_alter().
+ *
+ * This hook is called once per field per displayed entity. If the result of the
+ * hook involves reading from the database, it is highly recommended to
+ * statically cache the information.
+ *
+ * @param $display
+ * The display settings that will be used to display the field values, as
+ * found in the 'display' key of $instance definitions.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The entity type; e.g., 'node' or 'user'.
+ * - field: The field being rendered.
+ * - instance: The instance being rendered.
+ * - entity: The entity being rendered.
+ * - view_mode: The view mode, e.g. 'full', 'teaser'...
+ *
+ * @see hook_field_display_alter()
+ */
+function hook_field_display_ENTITY_TYPE_alter(&$display, $context) {
+ // Leave field labels out of the search index.
+ if ($context['view_mode'] == 'search_index') {
+ $display['label'] = 'hidden';
+ }
+}
+
+/**
+ * Alters the display settings of pseudo-fields before an entity is displayed.
+ *
+ * This hook is called once per displayed entity. If the result of the hook
+ * involves reading from the database, it is highly recommended to statically
+ * cache the information.
+ *
+ * @param $displays
+ * An array of display settings for the pseudo-fields in the entity, keyed
+ * by pseudo-field names.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The entity type; e.g., 'node' or 'user'.
+ * - bundle: The bundle name.
+ * - view_mode: The view mode, e.g. 'full', 'teaser'...
+ */
+function hook_field_extra_fields_display_alter(&$displays, $context) {
+ if ($context['entity_type'] == 'taxonomy_term' && $context['view_mode'] == 'full') {
+ $displays['description']['visible'] = FALSE;
+ }
+}
+
+/**
+ * Alters the widget properties of a field instance on a given entity type
+ * before it gets displayed.
+ *
+ * Modules can implement hook_field_widget_properties_ENTITY_TYPE_alter() to
+ * alter the widget properties for fields on a specific entity type, rather than
+ * implementing hook_field_widget_properties_alter().
+ *
+ * This hook is called once per field per displayed widget entity. If the result
+ * of the hook involves reading from the database, it is highly recommended to
+ * statically cache the information.
+ *
+ * @param $widget
+ * The instance's widget properties.
+ * @param $context
+ * An associative array containing:
+ * - entity_type: The entity type; e.g., 'node' or 'user'.
+ * - entity: The entity object.
+ * - field: The field that the widget belongs to.
+ * - instance: The instance of the field.
+ *
+ * @see hook_field_widget_properties_alter()
+ */
+function hook_field_widget_properties_ENTITY_TYPE_alter(&$widget, $context) {
+ // Change a widget's type according to the time of day.
+ $field = $context['field'];
+ if ($field['field_name'] == 'field_foo') {
+ $time = date('H');
+ $widget['type'] = $time < 12 ? 'widget_am' : 'widget_pm';
+ }
+}
+
+/**
+ * @} End of "addtogroup field_storage".
+ */
+
+/**
+ * @addtogroup field_crud
+ * @{
+ */
+
+/**
+ * Act on a field being created.
+ *
+ * This hook is invoked from field_create_field() after the field is created, to
+ * allow modules to act on field creation.
+ *
+ * @param $field
+ * The field just created.
+ */
+function hook_field_create_field($field) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on a field instance being created.
+ *
+ * This hook is invoked from field_create_instance() after the instance record
+ * is saved, so it cannot be used to modify the instance itself.
+ *
+ * @param $instance
+ * The instance just created.
+ */
+function hook_field_create_instance($instance) {
+ // @todo Needs function body.
+}
+
+/**
+ * Forbid a field update from occurring.
+ *
+ * Any module may forbid any update for any reason. For example, the
+ * field's storage module might forbid an update if it would change
+ * the storage schema while data for the field exists. A field type
+ * module might forbid an update if it would change existing data's
+ * semantics, or if there are external dependencies on field settings
+ * that cannot be updated.
+ *
+ * To forbid the update from occurring, throw a FieldUpdateForbiddenException.
+ *
+ * @param $field
+ * The field as it will be post-update.
+ * @param $prior_field
+ * The field as it is pre-update.
+ * @param $has_data
+ * Whether any data already exists for this field.
+ */
+function hook_field_update_forbid($field, $prior_field, $has_data) {
+ // A 'list' field stores integer keys mapped to display values. If
+ // the new field will have fewer values, and any data exists for the
+ // abandoned keys, the field will have no way to display them. So,
+ // forbid such an update.
+ if ($has_data && count($field['settings']['allowed_values']) < count($prior_field['settings']['allowed_values'])) {
+ // Identify the keys that will be lost.
+ $lost_keys = array_diff(array_keys($field['settings']['allowed_values']), array_keys($prior_field['settings']['allowed_values']));
+ // If any data exist for those keys, forbid the update.
+ $query = new EntityFieldQuery();
+ $found = $query
+ ->fieldCondition($prior_field['field_name'], 'value', $lost_keys)
+ ->range(0, 1)
+ ->execute();
+ if ($found) {
+ throw new FieldUpdateForbiddenException("Cannot update a list field not to include keys with existing data");
+ }
+ }
+}
+
+/**
+ * Act on a field being updated.
+ *
+ * This hook is invoked just after field is updated in field_update_field().
+ *
+ * @param $field
+ * The field as it is post-update.
+ * @param $prior_field
+ * The field as it was pre-update.
+ * @param $has_data
+ * Whether any data already exists for this field.
+ */
+function hook_field_update_field($field, $prior_field, $has_data) {
+ // Reset the static value that keeps track of allowed values for list fields.
+ drupal_static_reset('list_allowed_values');
+}
+
+/**
+ * Act on a field being deleted.
+ *
+ * This hook is invoked just after a field is deleted by field_delete_field().
+ *
+ * @param $field
+ * The field just deleted.
+ */
+function hook_field_delete_field($field) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on a field instance being updated.
+ *
+ * This hook is invoked from field_update_instance() after the instance record
+ * is saved, so it cannot be used by a module to modify the instance itself.
+ *
+ * @param $instance
+ * The instance as it is post-update.
+ * @param $prior_instance
+ * The instance as it was pre-update.
+ */
+function hook_field_update_instance($instance, $prior_instance) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on a field instance being deleted.
+ *
+ * This hook is invoked from field_delete_instance() after the instance is
+ * deleted.
+ *
+ * @param $instance
+ * The instance just deleted.
+ */
+function hook_field_delete_instance($instance) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on field records being read from the database.
+ *
+ * This hook is invoked from field_read_fields() on each field being read.
+ *
+ * @param $field
+ * The field record just read from the database.
+ */
+function hook_field_read_field($field) {
+ // @todo Needs function body.
+}
+
+/**
+ * Act on a field record being read from the database.
+ *
+ * This hook is invoked from field_read_instances() on each instance being read.
+ *
+ * @param $instance
+ * The instance record just read from the database.
+ */
+function hook_field_read_instance($instance) {
+ // @todo Needs function body.
+}
+
+/**
+ * Acts when a field record is being purged.
+ *
+ * In field_purge_field(), after the field configuration has been
+ * removed from the database, the field storage module has had a chance to
+ * run its hook_field_storage_purge_field(), and the field info cache
+ * has been cleared, this hook is invoked on all modules to allow them to
+ * respond to the field being purged.
+ *
+ * @param $field
+ * The field being purged.
+ */
+function hook_field_purge_field($field) {
+ db_delete('my_module_field_info')
+ ->condition('id', $field['id'])
+ ->execute();
+}
+
+/**
+ * Acts when a field instance is being purged.
+ *
+ * In field_purge_instance(), after the field instance has been
+ * removed from the database, the field storage module has had a chance to
+ * run its hook_field_storage_purge_instance(), and the field info cache
+ * has been cleared, this hook is invoked on all modules to allow them to
+ * respond to the field instance being purged.
+ *
+ * @param $instance
+ * The instance being purged.
+ */
+function hook_field_purge_instance($instance) {
+ db_delete('my_module_field_instance_info')
+ ->condition('id', $instance['id'])
+ ->execute();
+}
+
+/**
+ * Remove field storage information when a field record is purged.
+ *
+ * Called from field_purge_field() to allow the field storage module
+ * to remove field information when a field is being purged.
+ *
+ * @param $field
+ * The field being purged.
+ */
+function hook_field_storage_purge_field($field) {
+ $table_name = _field_sql_storage_tablename($field);
+ $revision_name = _field_sql_storage_revision_tablename($field);
+ db_drop_table($table_name);
+ db_drop_table($revision_name);
+}
+
+/**
+ * Remove field storage information when a field instance is purged.
+ *
+ * Called from field_purge_instance() to allow the field storage module
+ * to remove field instance information when a field instance is being
+ * purged.
+ *
+ * @param $instance
+ * The instance being purged.
+ */
+function hook_field_storage_purge_field_instance($instance) {
+ db_delete('my_module_field_instance_info')
+ ->condition('id', $instance['id'])
+ ->execute();
+}
+
+/**
+ * Remove field storage information when field data is purged.
+ *
+ * Called from field_purge_data() to allow the field storage
+ * module to delete field data information.
+ *
+ * @param $entity_type
+ * The type of $entity; for example, 'node' or 'user'.
+ * @param $entity
+ * The pseudo-entity whose field data to delete.
+ * @param $field
+ * The (possibly deleted) field whose data is being purged.
+ * @param $instance
+ * The deleted field instance whose data is being purged.
+ */
+function hook_field_storage_purge($entity_type, $entity, $field, $instance) {
+ list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
+
+ $table_name = _field_sql_storage_tablename($field);
+ $revision_name = _field_sql_storage_revision_tablename($field);
+ db_delete($table_name)
+ ->condition('entity_type', $entity_type)
+ ->condition('entity_id', $id)
+ ->execute();
+ db_delete($revision_name)
+ ->condition('entity_type', $entity_type)
+ ->condition('entity_id', $id)
+ ->execute();
+}
+
+/**
+ * @} End of "addtogroup field_crud".
+ */
+
+/**
+ * Determine whether the user has access to a given field.
+ *
+ * This hook is invoked from field_access() to let modules block access to
+ * operations on fields. If no module returns FALSE, the operation is allowed.
+ *
+ * @param $op
+ * The operation to be performed. Possible values: 'edit', 'view'.
+ * @param $field
+ * The field on which the operation is to be performed.
+ * @param $entity_type
+ * The type of $entity; for example, 'node' or 'user'.
+ * @param $entity
+ * (optional) The entity for the operation.
+ * @param $account
+ * (optional) The account to check; if not given use currently logged in user.
+ *
+ * @return
+ * TRUE if the operation is allowed, and FALSE if the operation is denied.
+ */
+function hook_field_access($op, $field, $entity_type, $entity, $account) {
+ if ($field['field_name'] == 'field_of_interest' && $op == 'edit') {
+ return user_access('edit field of interest', $account);
+ }
+ return TRUE;
+}
+
+/**
+ * @} End of "addtogroup hooks".
+ */