Places a UniqueField constraint on the bibcite_doi field
Needs the Bibliography & Citation module to work
| name: 'Bibliography & Citation - Unique Constraint DOI' | |
| type: module | |
| description: Do not save more than one ref per DOI | |
| core: 8.x | |
| core_version_requirement: ^8 || ^9 | |
| package: Bibliography & Citation | |
| dependencies: | |
| - bibcite:bibcite | |
| - bibcite:bibcite_entity |
| <?php | |
| use Drupal\Core\Entity\EntityInterface; | |
| use Drupal\Core\Entity\EntityTypeInterface; | |
| use Symfony\Component\Serializer\Exception\UnexpectedValueException; | |
| /** | |
| * Implements hook_entity_base_field_info_alter() | |
| * and hook_ENTITY_TYPE_presave() | |
| */ | |
| function bibcite_unique_constraint_doi_entity_base_field_info_alter(&$fields, EntityTypeInterface $entity_type) { | |
| if ($entity_type->id() === 'bibcite_reference') { | |
| if (isset($fields['bibcite_doi'])) { | |
| $fields['bibcite_doi']->addConstraint('UniqueField'); | |
| } | |
| } | |
| } | |
| function bibcite_unique_constraint_doi_bibcite_reference_presave(EntityInterface $entity) { | |
| if ($entity->getEntityTypeId() != 'bibcite_reference') { | |
| return; | |
| } | |
| $bibcitedoi = $entity->get('bibcite_doi')->value; | |
| $violations = $entity->bibcite_doi->validate(); | |
| if (count($violations) > 0) { | |
| throw new UnexpectedValueException("DOI '{$bibcitedoi}' exists."); | |
| } | |
| } |