hasOne(Student::class, 'id', 'student_id')->bind(['student_name', 'student_account'=>'account']); } public function teacher() { return $this->hasOne(Teacher::class, 'id', 'teacher_id')->bind(['teacher_name', 'teacher_account'=>'account']); } public function subject() { return $this->hasOne(Subject::class, 'id', 'subject_id')->bind(['subject_name', 'english_name']); } }