model hasManyThrough 使用枢轴模型的关系

Question

我有以下模型/表：

branch:
    id - integer

department:
    id - integer

teacher:
    id  - integer
    branch_department_id - integer

branch_department:
    id - integer
    branch_id - integer
    department_id - integer

• 每个

  branch

  通过数据透视表有很多

  departments

  branch_department

• 每个

  branch_department

  有很多

  teacher

  s

我想模拟

hasManythrough

和

branch

s

之间的

teacher

关系

所以从一个特定的

branch

我想让所有老师通过与那个相关的每一个

branch_department

branch

我怎么定义这个？

Answer 1

添加 branch_department 模型和：

class Branch extends Model
{
    public function teachers()
    {
        return $this->hasManyThrough(
            Teacher::class,
            BranchDepartment::class,
            'branch_id',
            'id',
            'id',
            'teacher_id'
        );
    }
}

Answer 2

如果你还没有定义一个

BranchDepartment

模型。

class BranchDepartment extends Pivot
{
}

从这里你可以在你的

hasManyThrough

模型上定义

Branch

关系。

public function teachers()
{
    return $this->hasManyThrough(Teacher::class, BranchDepartment::class);
}