How to show 2 instances of the user profile form, displaying different form modes, on the same page?

Question

I would like to show 2 instances of the User Profile edit form on the same page. One form mode only shows the username/password widget with the submit button. The other form mode only shows the contact information with the submit button.

When I try the following, I get Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException: The "user" entity type did not specify a "user.change_password" form class. Note that I've changed the form class to change_password as well.

$user = User::loadMultiple([$this->account->id()]);
$form = $this->entityFormBuilder->getForm($user[$this->account->id(), 'change_password']

I asked a similar question regarding custom entities but using that solution would require modifying core files.

Is it possible to do this?

Answer 1

You don't need to modify core files, you can modify the "user" entity type in a hook. This is how you add a form class for the form operation change_password:

mymodule.module

function mymodule_entity_type_build(array &$entity_types) {
  $entity_types['user']->setFormClass('change_password', 'Drupal\user\ProfileForm');
}