emr.module

<?php

/**
 * @file
 * Entity Meta Relation module.
 */

declare(strict_types=1);

use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\BaseFieldDefinition;
use Drupal\Core\Form\FormStateInterface;
use Drupal\emr\ContentFormHandlerInterface;

/**
 * Implements hook_form_alter().
 */
function emr_form_alter(&$form, FormStateInterface &$form_state) {
  $form_object = $form_state->getFormObject();
  if (!$form_object instanceof ContentEntityForm ||
    !in_array($form_object->getOperation(), ['add', 'edit', 'default'])) {
    return;
  }

  $entity = $form_object->getEntity();
  if (!\Drupal::entityTypeManager()->hasHandler($entity->getEntityTypeId(), 'emr_content_form')) {
    return;
  }

  // We don't want to show the meta form on the translation form of the entity.
  if (!$entity->isDefaultTranslation()) {
    return;
  }

  $handler = \Drupal::entityTypeManager()->getHandler($entity->getEntityTypeId(), 'emr_content_form');
  if ($handler instanceof ContentFormHandlerInterface) {
    $form = $handler->addFormElements($form, $form_state, $entity);
  }
}

/**
 * Implements hook_inline_entity_form_reference_form_alter().
 */
function emr_inline_entity_form_entity_form_alter(&$reference_form, &$form_state) {
  // Hide non desirable fields for entity meta when show in inline entity form.
  if ($reference_form['#entity_type'] == 'entity_meta') {
    $reference_form['status']['#access'] = FALSE;
    $reference_form['created']['#access'] = FALSE;
    $reference_form['revision_log']['#access'] = FALSE;
  }
}

/**
 * Implements hook_entity_base_field_info().
 */
function emr_entity_base_field_info(EntityTypeInterface $entity_type) {
  if (!$entity_type->get('entity_meta_relation_bundle')) {
    // If the entity type is not connected with an EntityMeta, we don't need to
    // do anything.
    return [];
  }

  // Add emr computed field to have the related entity metas.
  $fields['emr_entity_metas'] = BaseFieldDefinition::create('emr_item_entity_metas')
    ->setName('emr_entity_metas')
    ->setLabel(t('Entity metas'))
    ->setComputed(TRUE)
    ->setSetting('target_type', 'entity_meta')
    ->setDisplayConfigurable('view', FALSE);

  return $fields;
}