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I want to create my own version of the add/edit form for an entity defined in contrib module (drupal_commerce). I assumed i'd be able to adapt the example here http://www.foreach.be/blog/how-manipulate-forms-drupal-8 to alter route for entity forms. However i am getting the following when i try to load edit

Fatal error: Call to a member function getEntityTypeId() on a non-object in C:\xampp\htdocs\tocyn\core\lib\Drupal\Core\Entity\EntityForm.php on line 82

My route subscriber looks like:

 if ($route = $collection->get('entity.commerce_product.edit_form') ) { $defs = $route->getDefaults(); $route->setDefault('_form', '\Drupal\mymod\Form\EventForm'); }

And my new form:

class EventForm extends Drupal\commerce_product\Form\ProductForm { public function buildForm(array $form, FormStateInterface $form_state) { // doing nothing much here return $form; } }

Do i need to do something with _entity_form also?? Grateful for any feedback Mathew

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2 Answers 2

Reset to default
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Alternatively, you can use hook_entity_type_alter() to override the default form handler classes. It would be something like:

/** * Implements hook_entity_type_alter(). */ function mymod_entity_type_alter(array &$entity_types){ $entity_types['commerce_product']->setHandlerClass('form', array( 'edit' => 'Drupal\mymod\Form\EventForm' )); }
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  • For the delete operation, it works with setFormClass(). I would think for edit it should also be like that but I haven't tried. Commented Dec 3, 2024 at 3:04
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You need to change

$route->setDefault('_form', '\Drupal\mymod\Form\EventForm');

To

$route->setDefault('_entity_form', '\Drupal\mymod\Form\EventForm');

Otherwise the upcasting and other magical things are broken. See \Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider::getEditFormRoute where it gets defined initially.

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    I spotted that earlier on and tried it but it gave me a Drupal\Component\Plugin\Exception\PluginNotFoundException: The "\Drupal\mymod\Form\EventForm" entity type does not exist. in Drupal\Core\Entity\EntityTypeManager->getDefinition() (line 130 of core\lib\Drupal\Core\Entity\EntityTypeManager.php). I assumed that it was still looking for an '<entity>.<operation>' format as in the getEditFromRoute, instead of the form path as in your suggestion? Commented Feb 12, 2016 at 20:13
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    ok so just tried the above with entity.comment.edit_form re routed to my form extending CommentForm this time. Just incase something in Product Entity setup is causing it to fail - but I am getting a access denied on trying to access edit form - confused?! Commented Feb 13, 2016 at 20:27
  • This is a wrong answer. The '_entity_form' should be something like 'commerce_product.some_operation'. Using a class won't work. You can check setParametersFromEntityInformation() that is expecting to get the entity type from the '_entity_form' value and it will fail and that is why like this it may happen the access denied as @Mathew said. Commented Dec 3, 2024 at 2:59

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