hook_entity_prepare_form(\Drupal\Core\Entity\EntityInterface $entity, $operation, \Drupal\Core\Form\FormStateInterface $form_state)
Acts on an entity object about to be shown on an entity form.
This can be typically used to pre-fill entity values or change the form state before the entity form is built. It is invoked just once when first building the entity form. Rebuilds will not trigger a new invocation.
\Drupal\Core\Entity\EntityInterface $entity: The entity that is about to be shown on the form.
$operation: The current operation.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
\Drupal\Core\Entity\EntityForm::prepareEntity()
hook_ENTITY_TYPE_prepare_form()
function hook_entity_prepare_form(\Drupal\Core\Entity\EntityInterface $entity, $operation, \Drupal\Core\Form\FormStateInterface $form_state) { if ($operation == 'edit') { $entity->label->value = 'Altered label'; $form_state->set('label_altered', TRUE); } }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!entity.api.php/function/hook_entity_prepare_form/8.1.x