Get the relation instance for the given relation name.
| public getRelation ( string $name ) : Illuminate\Database\Eloquent\Relations\Relation | ||
| $name | string | |
| return | Illuminate\Database\Eloquent\Relations\Relation | |
/**
* Get queries to fetch relationships.
*
* @param Builder $builder
* @param array $models
* @param string $name
* @param Closure $constraints
* @return array
*/
protected function getQueries(Builder $builder, array $models, $name, Closure $constraints)
{
return collect($models)->map(function ($model) use($builder, $name, $constraints) {
$relation = $builder->getRelation($name);
$relation->addEagerConstraints([$model]);
call_user_func_array($constraints, [$relation, $model]);
if (method_exists($relation, 'getSelectColumns')) {
$r = new ReflectionMethod(get_class($relation), 'getSelectColumns');
$r->setAccessible(true);
$select = $r->invoke($relation, ['*']);
$relation->addSelect($select);
}
$relation->initRelation([$model], $name);
return $relation;
});
}
/**
* Get the relation instance for the given relation name.
*
* @param string $relation
*
* @return Relation
* @throws BadRequestException
*/
public function getRelation($relation)
{
$query = Relation::noConstraints(function () use($relation) {
/** @var BaseModel $model */
$model = $this->getModel();
$relationType = $model->getReferencingType($relation);
if (RelationSchema::HAS_MANY === $relationType) {
return $model->getHasManyByRelationName($relation);
} elseif (RelationSchema::MANY_MANY === $relationType) {
return $model->getBelongsToManyByRelationName($relation);
} elseif (RelationSchema::BELONGS_TO === $relationType) {
return $model->getBelongsToByRelationName($relation);
}
return null;
});
if (!empty($query)) {
return $query;
}
if (!method_exists($this->getModel(), $relation)) {
throw new BadRequestException('Unknown relationship: ' . $relation);
}
return parent::getRelation($relation);
}
