public FieldConfigInterface::setConstraints(array $constraints)
Sets the array of validation constraints for the FieldItemList.
NOTE: This will overwrite any previously set constraints. In most cases FieldConfigInterface::addConstraint() should be used instead.
Note that constraints added via this method are not stored in configuration and as such need to be added at runtime using hook_entity_bundle_field_info_alter().
array $constraints: The array of constraints. See \Drupal\Core\TypedData\TypedDataManager::getConstraints() for details.
$this
\Drupal\Core\TypedData\DataDefinition::addConstraint()
\Drupal\Core\TypedData\DataDefinition::getConstraints()
\Drupal\Core\Field\FieldItemList
hook_entity_bundle_field_info_alter()
public function setConstraints(array $constraints);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldConfigInterface.php/function/FieldConfigInterface::setConstraints/8.1.x