Laravel Seed多重关系

Question

我有三种型号：Member，Invoice和Payment

下面是Member模型：

class Member extends Model
{
     public function invoice()
     {
          return $this->hasOne(Invoice::class);
     }
}

在Invoice模型中：

class Invoice extends Model
{
     public function member()
     {
        return $this->belongsTo(Member::class, 'member_id');
     }

     public function payments()
     {
        return $this->hasMany(Payment::class, 'invoice_id');
     }
}

最后是Payment模型：

class Payment extends Model
{
     public function invoice()
     {
          return $this->belongsTo(Invoice::class, 'invoice_id');
     }
}

现在，在我的种子中，我想为每个成员的每一张发票创建一笔付款：

public function run()
{
   factory(Member::class, 100)->create()->each(function ($m) {
       $m->invoice()->save(factory(App\Invoice::class)->create()->each(function ($i) {
           $i->payments()->save(factory(App\Payment::class)->make());
     }));
  });
}

但是当我尝试播种时，它会返回一个错误：

Symfony\Component\Debug\Exception\FatalThrowableError  : Type error: Argument 1 passed to Illuminate\Database\Eloquent\Relations\HasOneOrMany::save() must be an instance of Illuminate\Database\Eloquent\Model, boolean given

我如何才能实现我想要的输出？

Answer 1

参考- Factory Callbacks和saveMany function

现在，在您的MemberFactory.php，中添加以下内容

$factory->afterCreating(App\Member::class, function ($member, $faker) {
  $member->invoice()->save(factory(App\Invoice::class)->make());
});

在you InvoiceFactory.php，中添加以下内容

$factory->afterMaking(App\Invoice::class, function ($invoice, $faker) {
  $invoice->payments()->saveMany(factory(App\Payment::class, 5)->make());
});

最后，在run()函数中，执行

public function run()
{
  factory(Member::class, 100)->create();
}

尚未测试，但应该可以工作:)

另外，我认为你的关系中不需要第二个参数。如果您使用的是单一命名法，该函数应该能够自动获得外键匹配。

Answer 2

在you seed/Databaseeder.php中(在Laravel 7中测试)

public function run()
    {
        factory(App\Member::class, 100)->create()->each(function ($m) {
            // Seed the relation with one address
            $invoice = factory(App\Invoice::class)->make();
            $payments = factory(App\Payment::class,5)->make();
            $m->invoice()-save($invoice);
            $invoice->payments()->saveMany($payments)
        });
    }

run函数表示为每个成员模型创建100个成员模型实例，创建一个发票模型，并为每个发票创建5个付款模型