384 lines
11 KiB
PHP
384 lines
11 KiB
PHP
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<?php
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namespace Illuminate\Database\Eloquent\Relations;
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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\ComparesRelatedModels;
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use Illuminate\Database\Eloquent\Relations\Concerns\InteractsWithDictionary;
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use Illuminate\Database\Eloquent\Relations\Concerns\SupportsDefaultModels;
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class BelongsTo extends Relation
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{
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use ComparesRelatedModels,
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InteractsWithDictionary,
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SupportsDefaultModels;
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/**
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* The child model instance of the relation.
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*
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* @var \Illuminate\Database\Eloquent\Model
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*/
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protected $child;
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/**
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* The foreign key of the parent model.
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*
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* @var string
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*/
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protected $foreignKey;
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/**
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* The associated key on the parent model.
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*
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* @var string
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*/
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protected $ownerKey;
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/**
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* The name of the relationship.
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*
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* @var string
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*/
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protected $relationName;
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/**
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* Create a new belongs 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 $child
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* @param string $foreignKey
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* @param string $ownerKey
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* @param string $relationName
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* @return void
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*/
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public function __construct(Builder $query, Model $child, $foreignKey, $ownerKey, $relationName)
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{
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$this->ownerKey = $ownerKey;
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$this->relationName = $relationName;
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$this->foreignKey = $foreignKey;
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// In the underlying base relationship class, this variable is referred to as
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// the "parent" since most relationships are not inversed. But, since this
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// one is we will create a "child" variable for much better readability.
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$this->child = $child;
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parent::__construct($query, $child);
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}
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/**
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* Get the results of the relationship.
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*
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* @return mixed
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*/
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public function getResults()
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{
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if (is_null($this->child->{$this->foreignKey})) {
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return $this->getDefaultFor($this->parent);
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}
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return $this->query->first() ?: $this->getDefaultFor($this->parent);
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}
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/**
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* Set the base constraints on the relation query.
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*
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* @return void
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*/
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public function addConstraints()
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{
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if (static::$constraints) {
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// For belongs to relationships, which are essentially the inverse of has one
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// or has many relationships, we need to actually query on the primary key
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// of the related models matching on the foreign key that's on a parent.
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$table = $this->related->getTable();
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$this->query->where($table.'.'.$this->ownerKey, '=', $this->child->{$this->foreignKey});
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}
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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 $models)
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{
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// We'll grab the primary key name of the related models since it could be set to
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// a non-standard name and not "id". We will then construct the constraint for
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// our eagerly loading query so it returns the proper models from execution.
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$key = $this->related->getTable().'.'.$this->ownerKey;
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$whereIn = $this->whereInMethod($this->related, $this->ownerKey);
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$this->query->{$whereIn}($key, $this->getEagerModelKeys($models));
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}
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/**
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* Gather the keys from an array of related models.
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*
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* @param array $models
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* @return array
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*/
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protected function getEagerModelKeys(array $models)
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{
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$keys = [];
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// First we need to gather all of the keys from the parent models so we know what
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// to query for via the eager loading query. We will add them to an array then
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// execute a "where in" statement to gather up all of those related records.
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foreach ($models as $model) {
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if (! is_null($value = $model->{$this->foreignKey})) {
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$keys[] = $value;
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}
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}
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sort($keys);
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return array_values(array_unique($keys));
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}
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/**
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* Initialize the relation on a set of models.
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*
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* @param array $models
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* @param string $relation
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* @return array
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*/
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public function initRelation(array $models, $relation)
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{
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foreach ($models as $model) {
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$model->setRelation($relation, $this->getDefaultFor($model));
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}
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return $models;
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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, $relation)
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{
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$foreign = $this->foreignKey;
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$owner = $this->ownerKey;
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// First we will get to build a dictionary of the child models by their primary
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// key of the relationship, then we can easily match the children back onto
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// the parents using that dictionary and the primary key of the children.
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$dictionary = [];
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foreach ($results as $result) {
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$attribute = $this->getDictionaryKey($result->getAttribute($owner));
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$dictionary[$attribute] = $result;
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}
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// Once we have the dictionary constructed, we can loop through all the parents
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// and match back onto their children using these keys of the dictionary and
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// the primary key of the children to map them onto the correct instances.
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foreach ($models as $model) {
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$attribute = $this->getDictionaryKey($model->{$foreign});
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if (isset($dictionary[$attribute])) {
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$model->setRelation($relation, $dictionary[$attribute]);
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}
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}
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return $models;
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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|int|string|null $model
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* @return \Illuminate\Database\Eloquent\Model
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*/
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public function associate($model)
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{
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$ownerKey = $model instanceof Model ? $model->getAttribute($this->ownerKey) : $model;
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$this->child->setAttribute($this->foreignKey, $ownerKey);
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if ($model instanceof Model) {
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$this->child->setRelation($this->relationName, $model);
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} else {
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$this->child->unsetRelation($this->relationName);
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}
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return $this->child;
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}
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/**
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* Dissociate previously associated model from the given parent.
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*
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* @return \Illuminate\Database\Eloquent\Model
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*/
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public function dissociate()
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{
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$this->child->setAttribute($this->foreignKey, null);
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return $this->child->setRelation($this->relationName, null);
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}
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/**
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* Alias of "dissociate" method.
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*
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* @return \Illuminate\Database\Eloquent\Model
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*/
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public function disassociate()
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{
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return $this->dissociate();
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}
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/**
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* Add the constraints for a relationship query.
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*
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* @param \Illuminate\Database\Eloquent\Builder $query
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* @param \Illuminate\Database\Eloquent\Builder $parentQuery
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* @param array|mixed $columns
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* @return \Illuminate\Database\Eloquent\Builder
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*/
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public function getRelationExistenceQuery(Builder $query, Builder $parentQuery, $columns = ['*'])
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{
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if ($parentQuery->getQuery()->from == $query->getQuery()->from) {
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return $this->getRelationExistenceQueryForSelfRelation($query, $parentQuery, $columns);
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}
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return $query->select($columns)->whereColumn(
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$this->getQualifiedForeignKeyName(), '=', $query->qualifyColumn($this->ownerKey)
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);
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}
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/**
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* Add the constraints for a relationship query on the same table.
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*
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* @param \Illuminate\Database\Eloquent\Builder $query
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* @param \Illuminate\Database\Eloquent\Builder $parentQuery
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* @param array|mixed $columns
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* @return \Illuminate\Database\Eloquent\Builder
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*/
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public function getRelationExistenceQueryForSelfRelation(Builder $query, Builder $parentQuery, $columns = ['*'])
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{
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$query->select($columns)->from(
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$query->getModel()->getTable().' as '.$hash = $this->getRelationCountHash()
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);
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$query->getModel()->setTable($hash);
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return $query->whereColumn(
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$hash.'.'.$this->ownerKey, '=', $this->getQualifiedForeignKeyName()
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);
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}
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/**
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* Determine if the related model has an auto-incrementing ID.
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*
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* @return bool
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*/
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protected function relationHasIncrementingId()
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{
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return $this->related->getIncrementing() &&
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in_array($this->related->getKeyType(), ['int', 'integer']);
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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 $this->related->newInstance();
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}
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/**
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* Get the child of the relationship.
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*
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* @return \Illuminate\Database\Eloquent\Model
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*/
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public function getChild()
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{
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return $this->child;
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}
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/**
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* Get the foreign key of the relationship.
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*
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* @return string
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*/
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public function getForeignKeyName()
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{
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return $this->foreignKey;
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}
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/**
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* Get the fully qualified foreign key of the relationship.
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*
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* @return string
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*/
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public function getQualifiedForeignKeyName()
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{
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return $this->child->qualifyColumn($this->foreignKey);
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}
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/**
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* Get the key value of the child's foreign key.
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*
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* @return mixed
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*/
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public function getParentKey()
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{
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return $this->child->{$this->foreignKey};
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}
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/**
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* Get the associated key of the relationship.
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*
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* @return string
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*/
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public function getOwnerKeyName()
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{
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return $this->ownerKey;
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}
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/**
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* Get the fully qualified associated key of the relationship.
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*
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* @return string
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*/
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public function getQualifiedOwnerKeyName()
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{
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return $this->related->qualifyColumn($this->ownerKey);
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}
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/**
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* Get the value of the model's associated key.
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*
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* @param \Illuminate\Database\Eloquent\Model $model
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* @return mixed
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*/
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protected function getRelatedKeyFrom(Model $model)
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{
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return $model->{$this->ownerKey};
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}
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/**
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* Get the name of the relationship.
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*
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* @return string
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*/
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public function getRelationName()
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{
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return $this->relationName;
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}
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}
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