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<?php namespace Illuminate\Database\Eloquent\Relations;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Support\Collection as BaseCollection;
class MorphTo extends BelongsTo {
/**
* The type of the polymorphic relation.
*
* @var string
*/
protected $morphType;
/**
* The models whose relations are being eager loaded.
*
* @var \Illuminate\Database\Eloquent\Collection
*/
protected $models;
/**
* All of the models keyed by ID.
*
* @var array
*/
protected $dictionary = array();
/**
* Create a new belongs to relationship instance.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $foreignKey
* @param string $otherKey
* @param string $type
* @param string $relation
* @return void
*/
public function __construct(Builder $query, Model $parent, $foreignKey, $otherKey, $type, $relation)
{
$this->morphType = $type;
parent::__construct($query, $parent, $foreignKey, $otherKey, $relation);
}
/**
* Set the constraints for an eager load of the relation.
*
* @param array $models
* @return void
*/
public function addEagerConstraints(array $models)
{
$this->buildDictionary($this->models = Collection::make($models));
}
/**
* Build a dictionary with the models.
*
* @param \Illuminate\Database\Eloquent\Models $models
* @return void
*/
protected function buildDictionary(Collection $models)
{
foreach ($models as $model)
{
if ($model->{$this->morphType})
{
$this->dictionary[$model->{$this->morphType}][$model->{$this->foreignKey}][] = $model;
}
}
}
/**
* Match the eagerly loaded results to their parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
public function match(array $models, Collection $results, $relation)
{
return $models;
}
/**
* Associate the model instance to the given parent.
*
* @param \Illuminate\Database\Eloquent\Model $model
* @return \Illuminate\Database\Eloquent\Model
*/
public function associate(Model $model)
{
$this->parent->setAttribute($this->foreignKey, $model->getKey());
$this->parent->setAttribute($this->morphType, get_class($model));
return $this->parent->setRelation($this->relation, $model);
}
/**
* Get the results of the relationship.
*
* Called via eager load method of Eloquent query builder.
*
* @return mixed
*/
public function getEager()
{
foreach (array_keys($this->dictionary) as $type)
{
$this->matchToMorphParents($type, $this->getResultsByType($type));
}
return $this->models;
}
/**
* Match the results for a given type to their parents.
*
* @param string $type
* @param \Illuminate\Database\Eloquent\Collection $results
* @return void
*/
protected function matchToMorphParents($type, Collection $results)
{
foreach ($results as $result)
{
if (isset($this->dictionary[$type][$result->getKey()]))
{
foreach ($this->dictionary[$type][$result->getKey()] as $model)
{
$model->setRelation($this->relation, $result);
}
}
}
}
/**
* Get all of the relation results for a type.
*
* @param string $type
* @return \Illuminate\Database\Eloquent\Collection
*/
protected function getResultsByType($type)
{
$instance = $this->createModelByType($type);
$key = $instance->getKeyName();
return $instance->whereIn($key, $this->gatherKeysByType($type)->all())->get();
}
/**
* Gather all of the foreign keys for a given type.
*
* @param string $type
* @return array
*/
protected function gatherKeysByType($type)
{
$foreign = $this->foreignKey;
return BaseCollection::make($this->dictionary[$type])->map(function($models) use ($foreign)
{
return head($models)->{$foreign};
})->unique();
}
/**
* Create a new model instance by type.
*
* @param string $type
* @return \Illuminate\Database\Eloquent\Model
*/
public function createModelByType($type)
{
return new $type;
}
/**
* Get the dictionary used by the relationship.
*
* @return array
*/
public function getDictionary()
{
return $this->dictionary;
}
}
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