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I have created a super-simple drupal 8 custom entity. We now need a custom view mode for this entity. What do I need to add to my definition to make my entity appear as an option on the 'Add View Mode' page: /admin/structure/display-modes/view/add ?

My super-simple entity definition is

 * @ContentEntityType(
 *   id = "schedulecal",
 *   label = @Translation("ScheduleCalendar"),
 *   base_table = "scheduler_entity_calendars",
 *   entity_keys = {
 *     "id" = "id",
 *     "uuid" = "uuid",
 *   },
 * )

I can't find this info anywhere in doc.

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1 Answer 1

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You need a view builder class in the handler section:

 *   handlers = {
 *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",

and a field UI route:

 *   field_ui_base_route = "my_entity.settings",

pointing at the config form for the settings of your entity type. If you don't have settings return at least a #markup element:

  public function buildForm(array $form, FormStateInterface $form_state) {
    $form['my_entity_settings']['#markup'] = 'Settings form for My Entity entities. Manage field settings here.';
    return $form;
  }
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  • I also had to add a route to my_entity.settings passing it the form like so - form: '\Drupal\my_module\Form\MySettingsForm'
    – Cameron
    Sep 23, 2022 at 11:06
  • Oh and to actually theme the view mode via a template you will need to implement a theme hook, as outlined here jimconte.com/blog/web/themeing-a-custom-content-entity
    – Cameron
    Sep 23, 2022 at 11:26

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