core_extend-8.x-1.0-alpha3/core_extend.module

<?php

/**
 * @file
 * Contains core_extend.module.
 */

use Drupal\Core\Field\FieldStorageDefinitionInterface;

/**
 * Implements hook_theme().
 */
function core_extend_theme() {
  $theme = [];
  $theme['core_extend_entity_form'] = [
    'render element' => 'form',
  ];

  return $theme;
}

/**
 * Allow reverse relationships for base fields.
 */
function core_extend_entity_reference_add_views_reverse_relationship(array &$data, FieldStorageDefinitionInterface $field_storage) {
  $entity_type_manager = \Drupal::entityTypeManager();
  $field_name = $field_storage->getName();

  $entity_type_id = $field_storage->getTargetEntityTypeId();
  $entity_type = $entity_type_manager->getDefinition($entity_type_id);
  /** @var \Drupal\Core\Entity\Sql\DefaultTableMapping $entity_table_mapping */
  $entity_table_mapping = $entity_type_manager->getStorage($entity_type_id)->getTableMapping();
  $entity_base_table = $entity_type->getDataTable() ?: $entity_type->getBaseTable();

  $target_entity_type_id = $field_storage->getSetting('target_type');
  $target_entity_type = $entity_type_manager->getDefinition($target_entity_type_id);
  $target_base_table = $target_entity_type->getDataTable() ?: $target_entity_type->getBaseTable();

  // Provide a reverse relationship for the entity type that is referenced by
  // the field.
  $args = [
    '@label' => $target_entity_type->getLowercaseLabel(),
    '@entity' => $entity_type->getLabel(),
    '@field_name' => $field_name,
  ];
  $pseudo_field_name = 'reverse__' . $entity_type_id . '__' . $field_name;
  if ($entity_table_mapping->requiresDedicatedTableStorage($field_storage)) {
    $data[$target_base_table][$pseudo_field_name] = [
      // There is a bridge table. Use the entity_reverse relationship plugin.
      'relationship' => [
        'title' => t('@entity using @field_name', $args),
        'label' => t('@field_name', ['@field_name' => $field_name]),
        'help' => t('Relate each @entity with a @field_name set to the @label.', $args),
        'group' => $target_entity_type->getLabel(),
        'id' => 'entity_reverse',
        'base' => $entity_base_table,
        'entity_type' => $entity_type_id,
        'base field' => $entity_type->getKey('id'),
        'field_name' => $field_name,
        'field table' => $entity_table_mapping->getFieldTableName($field_name),
        'field field' => $entity_table_mapping->getFieldColumnName($field_storage, 'target_id'),
      ],
    ];
  }
  else {
    // The data is on the base table. Use the standard relationship plugin.
    $data[$target_base_table][$pseudo_field_name] = [
      'relationship' => [
        'title' => t('@entity using @field_name', $args),
        'label' => t('@field_name', ['@field_name' => $field_name]),
        'help' => t('Relate each @entity with a @field_name set to the @label.', $args),
        'group' => $target_entity_type->getLabel(),
        'id' => 'standard',
        'relationship field' => $data[$target_base_table]['table']['base']['field'],
        'base' => $entity_base_table,
        'base field' => $entity_table_mapping->getFieldColumnName($field_storage, 'target_id'),
        'entity_type' => $entity_type_id,
      ],
    ];
  }

}