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<?php |
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namespace Flugg\Responder\Transformers\Concerns; |
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use Flugg\Responder\Contracts\Transformers\TransformerResolver; |
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use Illuminate\Contracts\Container\Container; |
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use Illuminate\Database\Eloquent\Model; |
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use Illuminate\Support\Collection; |
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/** |
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* A trait to be used by a transformer to handle relations |
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* |
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* @package flugger/laravel-responder |
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* @author Alexander Tømmerås <[email protected]> |
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* @license The MIT License |
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*/ |
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trait HasRelationships |
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{ |
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/** |
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* List of available relations. |
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* |
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* @var string[] |
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*/ |
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protected $relations = ['*']; |
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/** |
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* A list of autoloaded default relations. |
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* |
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* @var array |
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*/ |
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protected $load = []; |
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/** |
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* Get a list of default relations with eager load constraints. |
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* |
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* @return array |
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*/ |
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public function defaultRelations(): array |
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{ |
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$this->load = $this->normalizeRelations($this->load); |
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$relations = $this->addEagerLoadConstraints(array_keys($this->load)); |
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return array_merge($relations, $this->getNestedDefaultRelations()); |
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} |
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/** |
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* Normalize relations to force a key value structure. |
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* |
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* @param array $relations |
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* @return array |
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*/ |
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protected function normalizeRelations(array $relations): array |
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{ |
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$normalized = []; |
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foreach ($relations as $relation => $transformer) { |
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if (is_numeric($relation)) { |
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$relation = $transformer; |
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$transformer = null; |
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} |
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$normalized[$relation] = $transformer; |
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} |
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return $normalized; |
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} |
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/** |
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* Add eager load constraints to a list of relations. |
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* |
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* @param array $relations |
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* @return array |
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*/ |
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protected function addEagerLoadConstraints(array $relations): array |
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{ |
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$eagerLoads = []; |
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foreach ($relations as $relation) { |
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if (method_exists($this, $method = 'load' . ucfirst($relation))) { |
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$eagerLoads[$relation] = function ($query) use ($method) { |
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return $this->$method($query); |
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}; |
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} else { |
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$eagerLoads[] = $relation; |
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} |
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} |
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return $eagerLoads; |
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} |
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/** |
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* Get a list of nested default relationships with eager load constraints. |
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* |
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* @return array |
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*/ |
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protected function getNestedDefaultRelations(): array |
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{ |
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return Collection::make($this->load)->filter(function ($transformer) { |
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return ! is_null($transformer); |
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})->flatMap(function ($transformer, $relation) { |
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return array_map(function ($nestedRelation) use ($relation) { |
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return "$relation.$nestedRelation"; |
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}, $this->resolveTransformer($transformer)->defaultRelations()); |
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})->all(); |
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} |
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/** |
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* Resolve a relationship from a model instance. |
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* |
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* @param \Illuminate\Database\Eloquent\Model $model |
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* @param string $identifier |
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* @return mixed |
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*/ |
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protected function resolveRelation(Model $model, string $identifier) |
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{ |
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if (method_exists($this, $method = 'filter' . ucfirst($identifier))) { |
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return $this->$method($model->$identifier); |
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} |
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return $model->$identifier; |
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} |
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/** |
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* Resolve a related transformer from a class name string. |
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* |
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* @param string $transformer |
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* @return mixed |
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*/ |
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protected function resolveTransformer(string $transformer) |
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{ |
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$resolver = $this->resolveContainer()->make(TransformerResolver::class); |
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return $resolver->resolve($transformer); |
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} |
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/** |
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* Resolve a container using the resolver callback. |
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* |
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* @return \Illuminate\Contracts\Container\Container |
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*/ |
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protected abstract function resolveContainer(): Container; |
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} |
flugger /
laravel-responder
