function FieldItemDataDefinition::getMainPropertyName

Returns the name of the main property, if any.

Some field items consist mainly of one main property, e.g. the value of a text field or the "target_id" of an entity reference. If the field item has no main property, the method returns NULL.

Return value

string|null The name of the value property, or NULL if there is none.

Overrides ComplexDataDefinitionInterface::getMainPropertyName

File

core/lib/Drupal/Core/Field/TypedData/FieldItemDataDefinition.php, line 71

Class

FieldItemDataDefinition

A typed data definition class for defining field items.

Namespace

Code

public function getMainPropertyName() {
  return $this->fieldDefinition
    ->getFieldStorageDefinition()
    ->getMainPropertyName();
}