Verbinden Sie PivotTable mit einer anderen Tabelle in Laravel

Question

Ich habe eine Viele-zu-Viele-Beziehung mit der folgenden Struktur:

|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               |
-----------------------

Wie Sie sehen, habe ich das typische 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()außer dem Versuch, ein Modell für eine Pivot-Tabelle zu erstellen und Beziehungen herzustellen, aber bisher hat es bei mir nicht funktioniert, ich überlasse Ihnen ein Beispiel meines aktuellen Modells.

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);
    }
}