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I have an Entity: EntityX. It installs correctly and works the way that I want it to; with, of course, one exception.

I want to attach an entity reference to a specific vocabulary. I have tried:

My vocabulary's machine name is: custom_vocabulary

In EntityX's definition I have the following defined in the baseFieldDefinitions function:

$fields['my_custom_vocabulary'] = BaseFieldDefinition::create('entity_reference')
  ->setLabel(t('Vocabulary'))
  ->setDescription(t('What was this tagged with.'))
  ->setSetting('target_type', 'custom_vocabulary')
  ->setSetting('handler', 'default')
  ->setDisplayOptions('view', array(
    'label' => 'above',
    'type' => 'author',
    'weight' => -3,
  ))
  ->setDisplayOptions('form', array(
    'type' => 'entity_reference_autocomplete',
    'settings' => array(
      'match_operator' => 'CONTAINS',
      'size' => 60,
      'placeholder' => '',
    ),
    'weight' => -3,
  ))
  ->setDisplayConfigurable('form', TRUE)
  ->setDisplayConfigurable('view', TRUE);

But when I go to install it, I get the following error:

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "custom_vocabulary" entity type does not exist. in /brew/www/html/core/lib/Drupal/Core/Entity/EntityTypeManager.php:133

While looking at the article defined in the installation profile for Drupal, I see that they use it as a field and not a true entity reference. Is there no way for me to do it this way? I can't have this all nicely bundled into one single entity.

What I don't know how to do is add a term from a vocabulary to an entity type.

3

Vocabularies are bundles of the entity type taxonomy term. If you want to reference a vocabulary then first set taxonomy_term as target type and second restrict the field to a specific vocabulary as target bundle:

$definition = BaseFieldDefinition::create('entity_reference')
  ->setSetting('target_type', 'taxonomy_term')
  ->setSetting('handler_settings', ['target_bundles' => ['custom_vocabulary' => 'custom_vocabulary']]);

See change record https://www.drupal.org/node/2576151

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