public function BaseFieldDefinition::__clone in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Field/BaseFieldDefinition.php \Drupal\Core\Field\BaseFieldDefinition::__clone()

Magic method: Implements a deep clone.

Overrides ListDataDefinition::__clone

File

core/lib/Drupal/Core/Field/BaseFieldDefinition.php, line 861

Class

BaseFieldDefinition

A class for defining entity fields.

Namespace

Drupal\Core\Field

Code

public function __clone() {
  parent::__clone();

  // The itemDefinition (\Drupal\Core\Field\TypedData\FieldItemDataDefinition)
  // has a property fieldDefinition, which is a recursive reference to the
  // parent BaseFieldDefinition, therefore the reference to the old object has
  // to be overwritten with a reference to the cloned one.
  $this->itemDefinition
    ->setFieldDefinition($this);

  // Reset the static cache of the field property definitions in order to
  // ensure that the clone will reference different field property definitions
  // objects.
  $this->propertyDefinitions = NULL;
}