public ComplexDataDefinitionBase::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/TypedData/ComplexDataDefinition