Laravel叶片关系使用模型

Question

我在这三个模型之间有关系

class Teach extends Model {

public function departments() {
    return $this->belongsToMany('App\Department', 'teach', 'id', 'department_id');
}

public function subjects() {
    return $this->belongsToMany('App\Subject', 'teach', 'id', 'subject_id');
}

public function teachers() {
    return $this->belongsToMany('App\Teacher', 'teach', 'id', 'teacher_id');
} 
}

我想使用这些关系列出特定教师的所有部门和科目，我曾尝试过此方法，但它不起作用$ teacher-> teach-> departments;

Answer 1

这是教师与部门之间的多对多关系

class Teacher extends Model {

  public function departments() {
    return $this->belongsToMany('App\Department', 'teach', 'teacher_id', 'department_id');
  }

}


class Department extends Model {

  public function teachers() {
    return $this->belongsToMany('App\Teacher', 'teach', 'department_id', 'teacher_id');
  }

}

现在获取数据

$teacher = Teacher::with('departments')->find(1);
$departments = $teacher->departments;