public EntityType::getConstraints()
Gets an array of validation constraints.
See \Drupal\Core\TypedData\DataDefinitionInterface::getConstraints() for details on how constraints are defined.
array[] An array of validation constraint definitions, keyed by constraint name. Each constraint definition can be used for instantiating \Symfony\Component\Validator\Constraint objects.
Overrides EntityTypeInterface::getConstraints
\Symfony\Component\Validator\Constraint
public function getConstraints() { return $this->constraints; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityType.php/function/EntityType::getConstraints/8.1.x