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Drupal example source code file (content_handler_relationship.inc)

This example Drupal source code file (content_handler_relationship.inc) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

array, delta, field, function, if, isset, item, max_delta, options, php, select, the, to, variable

The content_handler_relationship.inc Drupal example source code

<?php
// $Id: content_handler_relationship.inc,v 1.1.2.3 2008/10/24 12:31:58 yched Exp $

/**
 * @file
 * Handles content relationships and deals properly with multiple
 * values by allowing the views administrator to select deltas.
 */
class content_handler_relationship extends views_handler_relationship {
  var $content_field;

  function construct() {
    parent::construct();

    $this->content_field = content_fields($this->definition['content_field_name']);
  }

  function option_definition() {
    $options = parent::option_definition();
    $options['delta'] = array('default' => -1);

    return $options;
  }

  /**
   * Add a delta selector for multiple fields.
   */
  function options_form(&$form, &$form_state) {
    $field = $this->content_field;
    parent::options_form($form, $form_state);

    // Only add the form gadget if the field is multiple.
    if ($field['multiple']) {
      $max_delta = $field['multiple'];
      // 1 means unlimited.
      if ($max_delta == 1) {
        $max_delta = 10;
      }

      $options = array('-1' => t('All'));
      for ($i = 0; $i < $max_delta; $i++) {
        $options[$i] = $i + 1;
      }
      $form['delta'] = array(
        '#type' => 'select',
        '#options' => $options,
        '#default_value' => $this->options['delta'],
        '#title' => t('Delta'),
        '#description' => t('The delta allows you to select which item in a multiple value field to key the relationship off of. Select "1" to use the first item, "2" for the second item, and so on. If you select "All", each item in the field will create a new row, which may appear to cause duplicates.'),
      );
    }
  }

  function ensure_my_table() {
    if (!isset($this->table_alias)) {
      $join = $this->get_join();
      if (!isset($join->extra)) {
        $join->extra = array();
      }
      $delta = isset($this->options['delta']) ? $this->options['delta'] : -1;
      if ($delta != -1) {
        $join->extra[] = array(
          'field' => 'delta',
          'value' => $delta,
          'numeric' => TRUE,
        );
      }

      $this->table_alias = $this->query->add_table($this->table, $this->relationship, $join);
    }
    return $this->table_alias;
  }
}

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