findById($id); if (!$resource) { throw new BadRequestException('resource.not_found'); } return $resource; } public function checkCourse($id) { $validator = new Course(); return $validator->checkCourse($id); } public function checkChapter($id) { $validator = new Chapter(); return $validator->checkChapter($id); } public function checkUpload($id) { $validator = new Upload(); return $validator->checkUpload($id); } }