How to create an entity reference field in Drupal 8 programmatically

drupaldrupal-8

I want to create an entity reference field in Drupal 8 using my custom module. Like when someone clicks a link on a Drupal page, an entity reference field would be created in the page node type automatically.

Can anyone help me with this?

Best Answer

This will create an entity reference field for node content types with the article bundle.

$form['node_id'] = array(
    '#type' => 'entity_autocomplete',
    '#title' => $this->t('Node'),
    '#target_type' => 'node',
    '#selection_settings' => ['target_bundles' => ['article']],
    '#tags' => TRUE,
    '#size' => 30,
    '#maxlength' => 1024,
  );

Note you can change target_type for other entities like taxonomy_term.

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Drupal 8 create field programmatically

Checkout Field API for Drupal 8

It has several functions implemented and hook_entity_bundle_field_info might be what you need, here is an example of textfield from the docs of that hook

function hook_entity_bundle_field_info(\Drupal\Core\Entity\EntityTypeInterface $entity_type, $bundle, array $base_field_definitions) {
  // Add a property only to nodes of the 'article' bundle.
  if ($entity_type->id() == 'node' && $bundle == 'article') {
    $fields = array();
    $fields['mymodule_text_more'] = BaseFieldDefinition::create('string')
      ->setLabel(t('More text'))
      ->setComputed(TRUE)
      ->setClass('\Drupal\mymodule\EntityComputedMoreText');
    return $fields;
  }
}

You might also need Field Storage, checkout hook_entity_field_storage_info

How to create Hidden type Field in Drupal 8 Entity

There are two steps to make a field hidden in drupal 8 entity forms.

If you want to make an existing field hidden you may alter the form and update that field as

$form['your_field_name']['widget'][0]['value']['#type'] = 'hidden';
You can use https://www.drupal.org/project/field_hidden and by enabling this module, Select the 'Hidden field' widget for a field in the entity type's 'Manage form display' dialogue.

Best Answer

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How to create Hidden type Field in Drupal 8 Entity

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