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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Drupal\primary_entity_reference\Plugin\Field; |
| 6 | |
| 7 | use Drupal\Core\Field\EntityReferenceFieldItemList; |
| 8 | use Drupal\Core\Field\EntityReferenceFieldItemListInterface; |
| 9 | |
| 10 | /** |
| 11 | * Defines an item list class for entity reference fields. |
| 12 | */ |
| 13 | class PrimaryEntityReferenceFieldItemList extends EntityReferenceFieldItemList implements EntityReferenceFieldItemListInterface { |
| 14 | |
| 15 | /** |
| 16 | * Magic method to get the primary item. |
| 17 | */ |
| 18 | public function __get($name) { |
| 19 | // This enables $item->primary to call $this->primary() |
| 20 | if ($name === 'primary') { |
| 21 | return $this->primary(); |
| 22 | } |
| 23 | |
| 24 | // Fallback to parent for other dynamic properties. |
| 25 | return parent::__get($name); |
| 26 | } |
| 27 | |
| 28 | /** |
| 29 | * {@inheritdoc} |
| 30 | */ |
| 31 | public function preSave() { |
| 32 | usort($this->list, function ($a, $b) { |
| 33 | return $b->get('primary')->getValue() <=> $a->get('primary')->getValue(); |
| 34 | }); |
| 35 | |
| 36 | parent::preSave(); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Gets the primary item, or the first item if none marked. |
| 41 | * |
| 42 | * @return \Drupal\Core\Field\FieldItemInterface|null |
| 43 | * The primary item, or NULL if none exist. |
| 44 | */ |
| 45 | public function primary() { |
| 46 | foreach ($this->list as $item) { |
| 47 | if ($item->get('primary')->getValue()) { |
| 48 | return $item; |
| 49 | } |
| 50 | } |
| 51 | // Fallback to first item. |
| 52 | return $this->list[0] ?? NULL; |
| 53 | } |
| 54 | |
| 55 | } |