Field validation not working.

I applied the changes but when I click saving the media, it throws a WSOD:

The website encountered an unexpected error. Please try again later.
TypeError: trim(): Argument #1 ($string) must be of type string, Drupal\Core\Field\FieldItemList given in trim() (line 169 of modules/contrib/media_entity_facebook/src/Plugin/media/Source/Facebook.php).
trim(Object) (Line: 169)
Drupal\media_entity_facebook\Plugin\media\Source\Facebook::parseFacebookEmbedField(Object) (Line: 30)
Drupal\media_entity_facebook\Plugin\Validation\Constraint\FacebookEmbedCodeConstraintValidator->validate(Object, Object) (Line: 201)
Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validateConstraints(Object, '00000000000009430000000000000000', Array) (Line: 153)
Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validateNode(Object) (Line: 163)
Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validateNode(Object, Array, 1) (Line: 105)
Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validate(Object, NULL, NULL) (Line: 93)
Drupal\Core\TypedData\Validation\RecursiveValidator->validate(Object) (Line: 132)
Drupal\Core\TypedData\TypedData->validate() (Line: 489)
Drupal\Core\Entity\ContentEntityBase->validate() (Line: 471)
Drupal\media\Entity\Media->validate() (Line: 188)
Drupal\Core\Entity\ContentEntityForm->validateForm(Array, Object)
call_user_func_array(Array, Array) (Line: 82)
Drupal\Core\Form\FormValidator->executeValidateHandlers(Array, Object) (Line: 275)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object, 'media_facebook_add_form') (Line: 118)
Drupal\Core\Form\FormValidator->validateForm('media_facebook_add_form', Array, Object) (Line: 593)
Drupal\Core\Form\FormBuilder->processForm('media_facebook_add_form', Array, Object) (Line: 325)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 73)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 169)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Hi @kaszarobert, I installed the theme and applied the patch in the comment #3 in the composer.json.

I did this with both Drupal 9 and 10 but was unable to get the error mentioned in the comment #4. But the patch file in the #3 solved the Field validation error.

See the attached screenshot for refrence.

What version of the module were you testing? Then I'll try it again.

Okay, for a new site, I can't reproduce the error I posted. I'll try to reproduce it later for the existing site I was working when checking this.

Also, it works only for media add/edit form. We need that to work on Media Library form as many editorial sites embed Facebook posts to article text with CKEditor or they have a separate media field where the Media Library widget is used to create and select media.

Alright, I could no longer reproduce the error I experienced. Probably I was doing something wrong during development. I decided to commit this and open a followup issue for Media Library validation 🐛 Field validation should work in Media Library widget Active .
Thanks for your work!

Automatically closed - issue fixed for 2 weeks with no activity.