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<?php |
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declare(strict_types=1); |
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namespace Stratadox\TableLoader\Loader; |
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use function in_array; |
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use Stratadox\Hydrator\ArrayHydrator; |
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use Stratadox\Hydrator\CannotHydrate; |
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use Stratadox\Hydrator\Hydrates; |
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/** |
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* Defines a has-many relationship. |
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* |
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* @author Stratadox |
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*/ |
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final class HasMany implements MakesConnections |
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{ |
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private $property; |
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private $collection; |
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private function __construct(string $property, Hydrates $collection) |
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{ |
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$this->property = $property; |
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$this->collection = $collection; |
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} |
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/** |
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* Makes a connector for a has-many type relationship. |
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* |
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* @param string $property The property to map. |
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* @param Hydrates|null $collection The collection hydrator to use. |
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* @return MakesConnections The relationship connector. |
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*/ |
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public static function in( |
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string $property, |
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Hydrates $collection = null |
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): MakesConnections { |
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return new self($property, $collection ?: ArrayHydrator::create()); |
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} |
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/** @inheritdoc */ |
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public function load( |
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KnowsWhereToLook $from, |
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array $data, |
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KnowsWhereToLookTo $to, |
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ContainsResultingObjects $objects |
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): array { |
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$related = []; |
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foreach ($data as $row) { |
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if ($to->ignoreThe($row)) { |
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continue; |
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} |
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$object = $objects[$to->label()][$to->this($row)]; |
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if ($this->shouldAdd($object, $from->this($row), $related)) { |
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$related[$from->this($row)][] = $object; |
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} |
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} |
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return [ |
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$this->property => $this->makeCollections($from->label(), $related) |
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]; |
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} |
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/** |
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* Checks if we should add the object to the relations collection. |
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* |
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* @param object $relation The related object. |
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* @param string $from The id of the object that holds the relationship. |
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* @param array $existing The map of existing relationships. |
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* @return bool Whether the object is new. |
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*/ |
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private function shouldAdd( |
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object $relation, |
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string $from, |
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array $existing |
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): bool { |
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return !isset($existing[$from]) |
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|| !in_array($relation, $existing[$from], true); |
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} |
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/** |
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* Makes collections for the relationship. |
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* |
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* @param string $from The label of the entity we connect from. |
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* @param array[] $many The objects to connect with. |
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* |
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* @return array The collections as [string id => iterable] |
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* @throws CannotLoadTable |
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*/ |
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private function makeCollections(string $from, array $many): array |
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{ |
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$collections = []; |
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foreach ($many as $id => $relatedObjects) { |
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try { |
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$collections[$id] = $this->collection->fromArray($relatedObjects); |
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} catch (CannotHydrate $exception) { |
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throw UnmappableRelationship::encountered( |
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$exception, |
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$this->property, |
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$from, |
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$id |
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); |
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} |
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} |
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return $collections; |
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} |
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} |
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Stratadox /
TableLoader
