No link template 'canonical' found for the 'paragraph' entity type

Just got this too with Drupal 10 core, Paragraphs 8.x-1.15:

Drupal\Core\Entity\Exception\UndefinedLinkTemplateException: No link template 'canonical' found for the 'paragraph' entity type in Drupal\Core\Entity\EntityBase->toUrl() (line 196 of core/lib/Drupal/Core/Entity/EntityBase.php).

I just got this too when I updated from Drupal 9.5.2 to Drupal 9.5.4 core, Paragraphs 8.x-1.15:

The website encountered an unexpected error. Please try again later.

Drupal\Core\Entity\Exception\UndefinedLinkTemplateException: No link template 'canonical' found for the 'paragraph' entity type in Drupal\Core\Entity\EntityBase->toUrl() (line 196 of core/lib/Drupal/Core/Entity/EntityBase.php).

How to solve this issue? I still got this.

This patch works for us in D9.

See #20 for example. You fix this error enabling verbose errors with backtrace, see who is incorrectly calling toUrl() on an entity without checking if it has a canonical link template. It might be comments, there is an issue referenced above, or another contrib or custom module.

I'm seeing this on Paragraphs 1.15.

The site is a build with no custom code touching this area. The error is resolved with the rerolled patch at #17 is working for me. @akhilavnair, the only tweak I'd suggest is code standards on the comment.

Given there are many reports of this being resolved by fixing it in Paragraphs I'm unsure why this isn't just being resolved here.

It works. Using the patch at #17 with cwegans/composer-patches for now.

In my case I need a view of the all webform submissions with a links to source entity and it's a paragraph for some cases... so the system can't to get it and I see a whitescreen.

got this problem again in my drupal 9, after upgrade the core to 10, the problem stay exist

https://www.drupal.org/project/paragraphs/issues/3404000 🐛 The website encountered an unexpected error. ( problem with layout builder ) Active

Liam Morland → made their first commit to this issue’s fork.

#17 was no longer applying for me.
Reroll #17

Rerolled patch at #35 applies and still works as expected.

Cheers @andysipple.

Patch in #35 did not work for my case, so I've followed the directions in #14 and filed an issue in the contrib module I'm using to better support Paragraphs by testing whether entities implement a canonical link template before calling toUrl()

📌 Support entity types that don't have link templates (like Paragraphs) Active

I was able to replicate this using paragraphs and core alone.

In our case, we had an image field on a paragraph. The image field was configured to link to content. In `core/modules/image/src/Plugin/Field/FieldFormatter/ImageFormatter.php`, that resolves to:

    if ($image_link_setting == 'content') {
      $entity = $items->getEntity();
      if (!$entity->isNew()) {
        $url = $entity->toUrl();

Since the paragraph is the parent entity in this case, core gets the paragraph, then attempts to generate the default link template, causing the error.

Removing the link to content resolves the error, but this is a workaround. The proper solution is that either core has to cross check that the default link template is available, or Paragraphs needs to provide it in all cases, even if it links to nothing.

Since Paragraphs ultimately have to be "attached" to some entity, perhaps there is a way that the canonical link implementation could dynamically recurse up the entity reference tree using Paragraphs::getParentEntity() until it finds the first parent entity that has a canonical link and return that?

This issue is reproduced when I have Paragraph as Reference inside Paragraph. It looks up for. parent link "canonical" but paragraph doesn't have canonical. I've attached patch for this. It is in ImageFormatter field. When you use Image in Paragraph and have link to parent.

Since the patch in Comment #40 is for Drupal core, I suggest creating a Drupal core issue if for no other reason than to see what core maintainers have to say about this issue.