397 lines
11 KiB
PHP
397 lines
11 KiB
PHP
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<?php
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namespace Illuminate\Database\Eloquent\Relations;
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use BadMethodCallException;
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use Illuminate\Database\Eloquent\Builder;
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use Illuminate\Database\Eloquent\Collection;
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use Illuminate\Database\Eloquent\Model;
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use Illuminate\Database\Eloquent\Relations\Concerns\InteractsWithDictionary;
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class MorphTo extends BelongsTo
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{
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use InteractsWithDictionary;
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/**
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* The type of the polymorphic relation.
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*
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* @var string
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*/
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protected $morphType;
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/**
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* The models whose relations are being eager loaded.
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*
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* @var \Illuminate\Database\Eloquent\Collection
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*/
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protected $models;
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/**
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* All of the models keyed by ID.
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*
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* @var array
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*/
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protected $dictionary = [];
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/**
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* A buffer of dynamic calls to query macros.
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*
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* @var array
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*/
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protected $macroBuffer = [];
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/**
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* A map of relations to load for each individual morph type.
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*
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* @var array
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*/
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protected $morphableEagerLoads = [];
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/**
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* A map of relationship counts to load for each individual morph type.
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*
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* @var array
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*/
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protected $morphableEagerLoadCounts = [];
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/**
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* A map of constraints to apply for each individual morph type.
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*
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* @var array
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*/
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protected $morphableConstraints = [];
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/**
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* Create a new morph to relationship instance.
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*
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* @param \Illuminate\Database\Eloquent\Builder $query
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* @param \Illuminate\Database\Eloquent\Model $parent
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* @param string $foreignKey
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* @param string $ownerKey
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* @param string $type
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* @param string $relation
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* @return void
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*/
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public function __construct(Builder $query, Model $parent, $foreignKey, $ownerKey, $type, $relation)
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{
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$this->morphType = $type;
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parent::__construct($query, $parent, $foreignKey, $ownerKey, $relation);
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}
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/**
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* Set the constraints for an eager load of the relation.
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*
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* @param array $models
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* @return void
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*/
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public function addEagerConstraints(array $models)
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{
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$this->buildDictionary($this->models = Collection::make($models));
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}
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/**
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* Build a dictionary with the models.
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*
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* @param \Illuminate\Database\Eloquent\Collection $models
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* @return void
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*/
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protected function buildDictionary(Collection $models)
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{
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foreach ($models as $model) {
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if ($model->{$this->morphType}) {
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$morphTypeKey = $this->getDictionaryKey($model->{$this->morphType});
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$foreignKeyKey = $this->getDictionaryKey($model->{$this->foreignKey});
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$this->dictionary[$morphTypeKey][$foreignKeyKey][] = $model;
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}
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}
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}
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/**
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* Get the results of the relationship.
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*
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* Called via eager load method of Eloquent query builder.
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*
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* @return mixed
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*/
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public function getEager()
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{
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foreach (array_keys($this->dictionary) as $type) {
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$this->matchToMorphParents($type, $this->getResultsByType($type));
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}
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return $this->models;
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}
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/**
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* Get all of the relation results for a type.
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*
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* @param string $type
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* @return \Illuminate\Database\Eloquent\Collection
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*/
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protected function getResultsByType($type)
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{
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$instance = $this->createModelByType($type);
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$ownerKey = $this->ownerKey ?? $instance->getKeyName();
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$query = $this->replayMacros($instance->newQuery())
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->mergeConstraintsFrom($this->getQuery())
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->with(array_merge(
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$this->getQuery()->getEagerLoads(),
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(array) ($this->morphableEagerLoads[get_class($instance)] ?? [])
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))
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->withCount(
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(array) ($this->morphableEagerLoadCounts[get_class($instance)] ?? [])
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);
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if ($callback = ($this->morphableConstraints[get_class($instance)] ?? null)) {
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$callback($query);
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}
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$whereIn = $this->whereInMethod($instance, $ownerKey);
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return $query->{$whereIn}(
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$instance->getTable().'.'.$ownerKey, $this->gatherKeysByType($type, $instance->getKeyType())
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)->get();
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}
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/**
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* Gather all of the foreign keys for a given type.
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*
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* @param string $type
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* @param string $keyType
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* @return array
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*/
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protected function gatherKeysByType($type, $keyType)
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{
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return $keyType !== 'string'
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? array_keys($this->dictionary[$type])
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: array_map(function ($modelId) {
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return (string) $modelId;
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}, array_filter(array_keys($this->dictionary[$type])));
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}
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/**
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* Create a new model instance by type.
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*
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* @param string $type
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* @return \Illuminate\Database\Eloquent\Model
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*/
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public function createModelByType($type)
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{
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$class = Model::getActualClassNameForMorph($type);
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return tap(new $class, function ($instance) {
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if (! $instance->getConnectionName()) {
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$instance->setConnection($this->getConnection()->getName());
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}
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});
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}
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/**
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* Match the eagerly loaded results to their parents.
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*
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* @param array $models
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* @param \Illuminate\Database\Eloquent\Collection $results
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* @param string $relation
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* @return array
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*/
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public function match(array $models, Collection $results, $relation)
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{
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return $models;
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}
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/**
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* Match the results for a given type to their parents.
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*
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* @param string $type
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* @param \Illuminate\Database\Eloquent\Collection $results
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* @return void
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*/
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protected function matchToMorphParents($type, Collection $results)
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{
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foreach ($results as $result) {
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$ownerKey = ! is_null($this->ownerKey) ? $this->getDictionaryKey($result->{$this->ownerKey}) : $result->getKey();
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if (isset($this->dictionary[$type][$ownerKey])) {
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foreach ($this->dictionary[$type][$ownerKey] as $model) {
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$model->setRelation($this->relationName, $result);
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}
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}
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}
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}
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/**
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* Associate the model instance to the given parent.
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*
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* @param \Illuminate\Database\Eloquent\Model $model
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* @return \Illuminate\Database\Eloquent\Model
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*/
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public function associate($model)
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{
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if ($model instanceof Model) {
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$foreignKey = $this->ownerKey && $model->{$this->ownerKey}
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? $this->ownerKey
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: $model->getKeyName();
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}
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$this->parent->setAttribute(
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$this->foreignKey, $model instanceof Model ? $model->{$foreignKey} : null
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);
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$this->parent->setAttribute(
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$this->morphType, $model instanceof Model ? $model->getMorphClass() : null
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);
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return $this->parent->setRelation($this->relationName, $model);
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}
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/**
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* Dissociate previously associated model from the given parent.
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*
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* @return \Illuminate\Database\Eloquent\Model
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*/
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public function dissociate()
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{
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$this->parent->setAttribute($this->foreignKey, null);
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$this->parent->setAttribute($this->morphType, null);
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return $this->parent->setRelation($this->relationName, null);
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}
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/**
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* Touch all of the related models for the relationship.
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*
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* @return void
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*/
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public function touch()
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{
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if (! is_null($this->child->{$this->foreignKey})) {
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parent::touch();
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}
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}
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/**
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* Make a new related instance for the given model.
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*
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* @param \Illuminate\Database\Eloquent\Model $parent
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* @return \Illuminate\Database\Eloquent\Model
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*/
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protected function newRelatedInstanceFor(Model $parent)
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{
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return $parent->{$this->getRelationName()}()->getRelated()->newInstance();
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}
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/**
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* Get the foreign key "type" name.
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*
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* @return string
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*/
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public function getMorphType()
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{
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return $this->morphType;
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}
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/**
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* Get the dictionary used by the relationship.
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*
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* @return array
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*/
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public function getDictionary()
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{
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return $this->dictionary;
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}
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/**
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* Specify which relations to load for a given morph type.
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*
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* @param array $with
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* @return \Illuminate\Database\Eloquent\Relations\MorphTo
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*/
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public function morphWith(array $with)
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{
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$this->morphableEagerLoads = array_merge(
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$this->morphableEagerLoads, $with
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);
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return $this;
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}
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/**
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* Specify which relationship counts to load for a given morph type.
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*
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* @param array $withCount
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* @return \Illuminate\Database\Eloquent\Relations\MorphTo
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*/
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public function morphWithCount(array $withCount)
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{
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$this->morphableEagerLoadCounts = array_merge(
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$this->morphableEagerLoadCounts, $withCount
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);
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return $this;
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}
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/**
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* Specify constraints on the query for a given morph type.
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*
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* @param array $callbacks
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* @return \Illuminate\Database\Eloquent\Relations\MorphTo
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*/
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public function constrain(array $callbacks)
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{
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$this->morphableConstraints = array_merge(
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$this->morphableConstraints, $callbacks
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);
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return $this;
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}
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/**
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* Replay stored macro calls on the actual related instance.
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*
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* @param \Illuminate\Database\Eloquent\Builder $query
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* @return \Illuminate\Database\Eloquent\Builder
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*/
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protected function replayMacros(Builder $query)
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{
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foreach ($this->macroBuffer as $macro) {
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$query->{$macro['method']}(...$macro['parameters']);
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}
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return $query;
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}
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/**
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* Handle dynamic method calls to the relationship.
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*
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* @param string $method
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* @param array $parameters
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* @return mixed
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*/
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public function __call($method, $parameters)
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{
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try {
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$result = parent::__call($method, $parameters);
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if (in_array($method, ['select', 'selectRaw', 'selectSub', 'addSelect', 'withoutGlobalScopes'])) {
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$this->macroBuffer[] = compact('method', 'parameters');
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}
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return $result;
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}
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// If we tried to call a method that does not exist on the parent Builder instance,
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// we'll assume that we want to call a query macro (e.g. withTrashed) that only
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// exists on related models. We will just store the call and replay it later.
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catch (BadMethodCallException $e) {
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$this->macroBuffer[] = compact('method', 'parameters');
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return $this;
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}
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}
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}
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