Club Drupal

    // Also add type-specific host entity references for all entity types that

    // have at least one field collection field.

    $field_collection_fields = field_read_fields(array('type' => 'field_collection'));

    $entity_types = entity_get_info();

    foreach (field_info_instances() as $entity_type => $bundles) {

      foreach ($bundles as $bundle => $fields) {

        if (array_intersect_key($fields, $field_collection_fields)) {

          $args = array('@type' => $entity_types[$entity_type]['label']);

          $properties["host_entity_$entity_type"] = array(

            'label' => t('Host entity (@type)', $args),

            'type' => $entity_type,

            'description' => t('The @type containing the field collection field (empty if this field collection is attached to an item of a different type).', $args),

            'getter callback' => 'field_collection_item_get_specific_type_host_entity',

            'computed' => TRUE,

          );

          break;

        }

      }

    }