将数据透视表与 Laravel 中的另一个表相关联

Question

我具有以下结构的多对多关系：

|Table receipts       |
|- id                 |
|- code               |
|- date               |
-----------------------
|Table plans          |
|- id                 |
|- number             |
|- name               |
-----------------------
|Table plan_receipt   |(Pivot)  
|- id                 |
|- receipt_id         |
|- plan_id            |
|- employee_id        |
-----------------------
|Table employees      |
|- id                 |
|- name               |
-----------------------

如您所见，我有典型的 many-to-many 关系，生成一个包含所述表的键的数据透视表，但我还有第三个 foreign key 引用另一个表 "employees"，如何我可以将这张员工表与我的表关联起来吗？枢？除了使用 ->using() 之外，尝试为数据透视表创建一个模型并建立关系，但到目前为止它对我来说还没有工作，我给你留下一个我当前模型的例子。

class Receipt extends Model
{
    public function plans()
    {
        return $this->belongsToMany(Plan::class)->using(PlanReceipt::class);
    }
}

class Plan extends Model
{
    public function receipts()
    {
        return $this->belongsToMany(Receipt::class);
    }
}

class PlanReceipt extends Pivot
{
    protected $table = 'plan_receipt';

    public function employee()
    {
        return $this->belongsTo(Employee::class, 'employee_id');
    }
}

class Employee extends Model
{
    public function plan_receipt()
    {
        return $this->hasMany(PlanReceipt::class, 'id');
    }
}

Answer 1

我猜您需要进行以下两项更改

class Employee extends Model
{
    public function plan_receipt()
    {
        //Specifying foreign key is not required as it is as per Eloquent convention
        return $this->hasMany(PlanReceipt::class);

        //If you want to specify the keys then it should be
        // return $this->hasMany(PlanReceipt::class, 'employee_id', 'id');
    }
}

class PlanReceipt extends Pivot
{
    protected $table = 'plan_receipt';

    //Assuming the id column on plan_receipt table is auto incrementing 
    public $incrementing = true; 

    public function employee()
    {
        //return $this->belongsTo(Employee::class, 'employee_id');

        //Specifying foreign key is not required as it is already as per Laravel Eloquent convention
        return $this->belongsTo(Employee::class);
    }
}