function onlyone_entity_type_alter in Allow a content type only once (Only One) 8

Implements hook_entity_type_alter().

File

./onlyone.module, line 227

Contains onlyone.module.

Code

function onlyone_entity_type_alter(array &$entity_types) {

  // Adding the constraint. Here is not possible to check specific content type.
  // @see https://drupal.stackexchange.com/q/208283/28275
  if (isset($entity_types['node'])) {
    $entity_types['node']
      ->addConstraint('OnlyOne');
  }
}