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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;
abstract class HasOneOrMany extends Relation {
/**
* The foreign key of the parent model.
*
* @var string
*/
protected $foreignKey;
/**
* The local key of the parent model.
*
* @var string
*/
protected $localKey;
/**
* Create a new has many relationship instance.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $foreignKey
* @return void
*/
public function __construct(Builder $query, Model $parent, $foreignKey, $localKey)
{
$this->localKey = $localKey;
$this->foreignKey = $foreignKey;
parent::__construct($query, $parent);
}
/**
* Set the base constraints on the relation query.
*
* @return void
*/
public function addConstraints()
{
if (static::$constraints)
{
$this->query->where($this->foreignKey, '=', $this->getParentKey());
}
}
/**
* Set the constraints for an eager load of the relation.
*
* @param array $models
* @return void
*/
public function addEagerConstraints(array $models)
{
$this->query->whereIn($this->foreignKey, $this->getKeys($models, $this->localKey));
}
/**
* Match the eagerly loaded results to their single parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
public function matchOne(array $models, Collection $results, $relation)
{
return $this->matchOneOrMany($models, $results, $relation, 'one');
}
/**
* Match the eagerly loaded results to their many parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
public function matchMany(array $models, Collection $results, $relation)
{
return $this->matchOneOrMany($models, $results, $relation, 'many');
}
/**
* Match the eagerly loaded results to their many parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @param string $type
* @return array
*/
protected function matchOneOrMany(array $models, Collection $results, $relation, $type)
{
$dictionary = $this->buildDictionary($results);
// Once we have the dictionary we can simply spin through the parent models to
// link them up with their children using the keyed dictionary to make the
// matching very convenient and easy work. Then we'll just return them.
foreach ($models as $model)
{
$key = $model->getAttribute($this->localKey);
if (isset($dictionary[$key]))
{
$value = $this->getRelationValue($dictionary, $key, $type);
$model->setRelation($relation, $value);
}
}
return $models;
}
/**
* Get the value of a relationship by one or many type.
*
* @param array $dictionary
* @param string $key
* @param string $type
* @return mixed
*/
protected function getRelationValue(array $dictionary, $key, $type)
{
$value = $dictionary[$key];
return $type == 'one' ? reset($value) : $this->related->newCollection($value);
}
/**
* Build model dictionary keyed by the relation's foreign key.
*
* @param \Illuminate\Database\Eloquent\Collection $results
* @return array
*/
protected function buildDictionary(Collection $results)
{
$dictionary = array();
$foreign = $this->getPlainForeignKey();
// First we will create a dictionary of models keyed by the foreign key of the
// relationship as this will allow us to quickly access all of the related
// models without having to do nested looping which will be quite slow.
foreach ($results as $result)
{
$dictionary[$result->{$foreign}][] = $result;
}
return $dictionary;
}
/**
* Attach a model instance to the parent model.
*
* @param \Illuminate\Database\Eloquent\Model $model
* @return \Illuminate\Database\Eloquent\Model
*/
public function save(Model $model)
{
$model->setAttribute($this->getPlainForeignKey(), $this->getParentKey());
return $model->save() ? $model : false;
}
/**
* Attach an array of models to the parent instance.
*
* @param array $models
* @return array
*/
public function saveMany(array $models)
{
array_walk($models, array($this, 'save'));
return $models;
}
/**
* Create a new instance of the related model.
*
* @param array $attributes
* @return \Illuminate\Database\Eloquent\Model
*/
public function create(array $attributes)
{
$foreign = array(
$this->getPlainForeignKey() => $this->getParentKey(),
);
// Here we will set the raw attributes to avoid hitting the "fill" method so
// that we do not have to worry about a mass accessor rules blocking sets
// on the models. Otherwise, some of these attributes will not get set.
$instance = $this->related->newInstance();
$instance->setRawAttributes(array_merge($attributes, $foreign));
$instance->save();
return $instance;
}
/**
* Create an array of new instances of the related model.
*
* @param array $records
* @return array
*/
public function createMany(array $records)
{
$instances = array();
foreach ($records as $record)
{
$instances[] = $this->create($record);
}
return $instances;
}
/**
* Perform an update on all the related models.
*
* @param array $attributes
* @return int
*/
public function update(array $attributes)
{
if ($this->related->usesTimestamps())
{
$attributes[$this->relatedUpdatedAt()] = $this->related->freshTimestamp();
}
return $this->query->update($attributes);
}
/**
* Get the key for comparing against the parent key in "has" query.
*
* @return string
*/
public function getHasCompareKey()
{
return $this->getForeignKey();
}
/**
* Get the foreign key for the relationship.
*
* @return string
*/
public function getForeignKey()
{
return $this->foreignKey;
}
/**
* Get the plain foreign key.
*
* @return string
*/
public function getPlainForeignKey()
{
$segments = explode('.', $this->getForeignKey());
return $segments[count($segments) - 1];
}
/**
* Get the key value of the paren's local key.
*
* @return mixed
*/
public function getParentKey()
{
return $this->parent->getAttribute($this->localKey);
}
/**
* Get the fully qualified parent key name.
*
* @return string
*/
public function getQualifiedParentKeyName()
{
return $this->parent->getTable().'.'.$this->localKey;
}
}
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