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<?php
/**
 * Sort handler to sort by last comment name which might be in 2 different
 * fields.
 *
 * @ingroup views_sort_handlers
 */
class views_handler_sort_ncs_last_comment_name extends views_handler_sort {
  function query() {
    $this->ensure_my_table();
    $join = new views_join();
    $join->construct('users', $this->table_alias, 'last_comment_uid', 'uid');

    // @todo this might be safer if we had an ensure_relationship rather than guessing
    // the table alias. Though if we did that we'd be guessing the relationship name
    // so that doesn't matter that much.
//    $this->user_table = $this->query->add_relationship(NULL, $join, 'users', $this->relationship);
    $this->user_table = $this->query->ensure_table('ncs_users', $this->relationship, $join);
    $this->user_field = $this->query->add_field($this->user_table, 'name');

    // Add the field.
    $this->query->add_orderby(NULL, "LOWER(COALESCE($this->user_table.name, $this->table_alias.$this->field))", $this->options['order'], $this->table_alias . '_' . $this->field);
  }
}