function entity_hierarchy_form_node_form_alter in Entity Reference Hierarchy 8

Implements Adds a vertical tab to the node form allowing a hierarchy parent to be selected or deleted. Here we're doing some permission checking, then presenting the form using the HierarchyManager class. We then use an #entity_builders callback function to save the form data to the node object.

See also

hook_form_BASE_FORM_ID_alter() for node_form().

HierarchyManagerInterface::addHierarchyFormElement

entity_hierarchy_node_builder

File

./entity_hierarchy.module, line 41

A module to make nodes hierarchical.

Code

function entity_hierarchy_form_node_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  // TODO: entity_hierarchy_set_breadcrumbs($node, TRUE);
  // Load the node object associated with this form
  $node = $form_state
    ->getFormObject()
    ->getEntity();
  $account = \Drupal::currentUser();

  /** @var \Drupal\entity_hierarchy\HierarchyManager $hierarchy_manager */
  $hierarchy_manager = \Drupal::service('entity_hierarchy.manager');

  // If this node type can be a child.
  // TODO: Probably should be doing access checking using a class like
  // EntityAccessControlHandler::access or more at the route/level

  /** @see \Drupal\Core\Entity\EntityAccessControlHandler::access */
  if ($hierarchy_manager
    ->hierarchyCanBeChild($node) || $hierarchy_manager
    ->hierarchyCanBeParent($node)) {

    // if the current user can edit the current node's hierarchy settings (or create new children)
    $uid = $node
      ->getOwnerId();
    $can_set_parent = $account
      ->hasPermission('edit all node parents') || $node
      ->isNew() && $account
      ->hasPermission('create child nodes') || $uid == $account
      ->getAccount()
      ->id() && $account
      ->hasPermission('edit own node parents');

    // Only show the form is the user has permission
    if ($can_set_parent) {
      $collapsed = TRUE;

      // Todo: fix (check if a parent is already set)
      $form = $hierarchy_manager
        ->addHierarchyFormElement($form, $form_state, $node, $account, $collapsed);

      // Form API entity_builders callback; see https://www.drupal.org/node/2420295
      $form['#entity_builders'][] = 'entity_hierarchy_node_builder';
    }
  }
}