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<?php namespace Illuminate\Database\Eloquent\Relations;
use Closure;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Query\Expression;
use Illuminate\Database\Eloquent\Collection;
abstract class Relation {
/**
* The Eloquent query builder instance.
*
* @var \Illuminate\Database\Eloquent\Builder
*/
protected $query;
/**
* The parent model instance.
*
* @var \Illuminate\Database\Eloquent\Model
*/
protected $parent;
/**
* The related model instance.
*
* @var \Illuminate\Database\Eloquent\Model
*/
protected $related;
/**
* Indicates if the relation is adding constraints.
*
* @var bool
*/
protected static $constraints = true;
/**
* Create a new relation instance.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @return void
*/
public function __construct(Builder $query, Model $parent)
{
$this->query = $query;
$this->parent = $parent;
$this->related = $query->getModel();
$this->addConstraints();
}
/**
* Set the base constraints on the relation query.
*
* @return void
*/
abstract public function addConstraints();
/**
* Set the constraints for an eager load of the relation.
*
* @param array $models
* @return void
*/
abstract public function addEagerConstraints(array $models);
/**
* Initialize the relation on a set of models.
*
* @param array $models
* @param string $relation
* @return array
*/
abstract public function initRelation(array $models, $relation);
/**
* Match the eagerly loaded results to their parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
abstract public function match(array $models, Collection $results, $relation);
/**
* Get the results of the relationship.
*
* @return mixed
*/
abstract public function getResults();
/**
* Get the relationship for eager loading.
*
* @return \Illuminate\Database\Eloquent\Collection
*/
public function getEager()
{
return $this->get();
}
/**
* Touch all of the related models for the relationship.
*
* @return void
*/
public function touch()
{
$column = $this->getRelated()->getUpdatedAtColumn();
$this->rawUpdate(array($column => $this->getRelated()->freshTimestampString()));
}
/**
* Restore all of the soft deleted related models.
*
* @return int
*/
public function restore()
{
return $this->query->withTrashed()->restore();
}
/**
* Run a raw update against the base query.
*
* @param array $attributes
* @return int
*/
public function rawUpdate(array $attributes = array())
{
return $this->query->update($attributes);
}
/**
* Add the constraints for a relationship count query.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Builder $parent
* @return \Illuminate\Database\Eloquent\Builder
*/
public function getRelationCountQuery(Builder $query, Builder $parent)
{
$query->select(new Expression('count(*)'));
$key = $this->wrap($this->getQualifiedParentKeyName());
return $query->where($this->getHasCompareKey(), '=', new Expression($key));
}
/**
* Run a callback with constraints disabled on the relation.
*
* @param \Closure $callback
* @return mixed
*/
public static function noConstraints(Closure $callback)
{
static::$constraints = false;
// When resetting the relation where clause, we want to shift the first element
// off of the bindings, leaving only the constraints that the developers put
// as "extra" on the relationships, and not original relation constraints.
$results = call_user_func($callback);
static::$constraints = true;
return $results;
}
/**
* Get all of the primary keys for an array of models.
*
* @param array $models
* @param string $key
* @return array
*/
protected function getKeys(array $models, $key = null)
{
return array_values(array_map(function($value) use ($key)
{
return $key ? $value->getAttribute($key) : $value->getKey();
}, $models));
}
/**
* Get the underlying query for the relation.
*
* @return \Illuminate\Database\Eloquent\Builder
*/
public function getQuery()
{
return $this->query;
}
/**
* Get the base query builder driving the Eloquent builder.
*
* @return \Illuminate\Database\Query\Builder
*/
public function getBaseQuery()
{
return $this->query->getQuery();
}
/**
* Get the parent model of the relation.
*
* @return \Illuminate\Database\Eloquent\Model
*/
public function getParent()
{
return $this->parent;
}
/**
* Get the fully qualified parent key name.
*
* @return string
*/
protected function getQualifiedParentKeyName()
{
return $this->parent->getQualifiedKeyName();
}
/**
* Get the related model of the relation.
*
* @return \Illuminate\Database\Eloquent\Model
*/
public function getRelated()
{
return $this->related;
}
/**
* Get the name of the "created at" column.
*
* @return string
*/
public function createdAt()
{
return $this->parent->getCreatedAtColumn();
}
/**
* Get the name of the "updated at" column.
*
* @return string
*/
public function updatedAt()
{
return $this->parent->getUpdatedAtColumn();
}
/**
* Get the name of the related model's "updated at" column.
*
* @return string
*/
public function relatedUpdatedAt()
{
return $this->related->getUpdatedAtColumn();
}
/**
* Wrap the given value with the parent query's grammar.
*
* @param string $value
* @return string
*/
public function wrap($value)
{
return $this->parent->getQuery()->getGrammar()->wrap($value);
}
/**
* Handle dynamic method calls to the relationship.
*
* @param string $method
* @param array $parameters
* @return mixed
*/
public function __call($method, $parameters)
{
$result = call_user_func_array(array($this->query, $method), $parameters);
if ($result === $this->query) return $this;
return $result;
}
}
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