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I want to use a different form altogether from the defined edit form for a given bundle of an entity. I have found how to swap the form for every bundle of the entity here:

Override entity form handler

However I cannot figure out how to do this on a per-bundle basis. Does anyone have a method?

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  • 1
    I remember looking for the same thing a while back and coming up empty. Looking at the code now (even in D11) there doesn't seem to be any hints that the entity form could be configurable per-bundle. You might have to make do with overriding the form class completely, and using the buildForm method to dispatch to other classes based on the bundle of the form object
    – Clive ♦
    Commented Nov 29 at 21:51
  • Thanks Clive, I've been working at exactly that, but not finding nice solutions. I can get the form to load, but trying to use any submit handlers causes core form errors. I'll keep plugging away!
    – Jaypan
    Commented Nov 29 at 23:40
  • I was overthinking it. It was actually quite simple.
    – Jaypan
    Commented Nov 30 at 16:15
  • Isn't that always the way :) It would still be nice to have proper support for this, feels like it wouldn't take much to implement. A feature request may be brewing...
    – Clive ♦
    Commented Dec 1 at 16:33
  • 1
    drupal.org/project/drupal/issues/3491100
    – Jaypan
    Commented Dec 2 at 16:41

1 Answer 1

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I've found a solution, and it was surprisingly simple. The answer was to swap out the entire form in a hook form alter implementation.

/**
 * Implements hook_form_alter().
 */
function MODULE_form_alter(array &$form, FormStateInterface $form_state, $form_id) {
  if ($form_id = [BUNDLE FORM ID]) {
    $form_entity = $form_state->getFormObject()->getEntity();
    $form = \Drupal::formBuilder()->getForm(FormClassToUseInstead::class, $form_entity);
  }
}

This works with ajax, and my form values are saving correctly.

-- Edit --

I'll note, this isn't ideal, as the original form is built before being swapped out. Ideally, core will provide a method of overriding the form by bundle. I have opened a feature request here:

https://www.drupal.org/project/drupal/issues/3491100

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