public function byLoan($id, Manager $fractal, PrerequisiteTransformer $prerequisiteTransformer)
 {
     //show single
     $records = Prerequisite::where('loan_id', $id)->get();
     $collection = new Collection($records, $prerequisiteTransformer);
     $data = $fractal->createData($collection)->toArray();
     return $this->respond($data);
 }