On Drupal 8, in a custom entity class, I'm trying to load a repository in the constructor to be able to use custom functions in the preSave().

class MyEntity extends ContentEntityBase implements MyModuleInterface {

private $customStuff;

public function __construct(array $values, $entity_type, &$bundle = FALSE, $translations = []) {
        $this->customStuff = \Drupal::service('mymodule.mymodule_repository');

(The service is defined in .services.yml in the correct module)

But I have the error :

The website encountered an unexpected error. Please try again later.Drupal\Component\Plugin\Exception\PluginNotFoundException: The "" entity type does not exist. in Drupal\Core\Entity\EntityTypeManager->getDefinition() (line 133 of core/lib/Drupal/Core/Entity/EntityTypeManager.php). Drupal\Core\Entity\EntityManager->getDefinition(NULL) (Line: 410)

How to inject custom dependence in custom entity ?

  • Drupal core doesn't set an error that matches the one in your question, so either that's not accurate, or a contrib/custom module is causing the problem
    – Clive
    Apr 13, 2018 at 9:56
  • I added the full stack error because yes it's an error provided by Drupal core....
    – Promo
    Apr 13, 2018 at 10:34

3 Answers 3


How to inject custom dependence in custom entity?

You cannot; per the Services and dependency injection documentation:

Note: It's not possible to inject services to entity object. See this issue for more details.

You'll have to get the service from \Drupal directly.


I forgot the take in account the inheritance of the parent __construct().

Here is the solution :

  public function __construct(array $values, $entity_type, $bundle = FALSE, $translations = []) {
    parent::__construct($values, $entity_type, $bundle, $translations);
    $this->customStuff = \Drupal::service('mymodule.mymodule_repository');

Have you added the Entity annotations? E.g:

 * Defines MyEntity entity.
 * @ingroup my_entity
 * @ContentEntityType(
 *   id = "my_entity",
 *   label = @Translation("My Entity"),
class MyEntity extends ContentEntityBase implements MyModuleInterface {


  • Yes annotation are there and the entity is working fine (it's a production code that I trying to improve)
    – Promo
    Apr 13, 2018 at 9:50
  • Ah ok is it the $entity_type parameter in your constructor that doesn't exist? Apr 13, 2018 at 9:53
  • Also, if your dependency can be required by composer, initialise a composer project in your module and include the autoload.php, I found that the easiest way of loading dependencies. Apr 13, 2018 at 9:54
  • I updated the error. The problem is not composer you should never load autoload in your module, i have to find the right way to load it with Drupal method.
    – Promo
    Apr 13, 2018 at 10:04
  • I've not heard of problems with autoloading in a module, have you got an article to hand explaining? If you have a mismatch of arguments, try using xdebug and trace back to the function that instantiates your class and see what is currently being passed there. I can't imagine you can change what's passed to your constructor, so you may need to amend your code to work with what Drupal gives you. Apr 13, 2018 at 10:24

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