Laravel/Cashier Invoices() 返回空对象

Question

我对泰勒 ( https://github.com/laravel/cashier ) 的收银包裹有疑问。当我尝试获取用户的发票时，返回的对象为空。有关信息，我已将收银员数据库列设置到成员(member)表中!然后建立适当的关系。如果我这样做，我可以向用户收费:

$user->membership->subscription('1month')->create($token);

但是如果我想像这样拿到发票

$invoices = $user->membership->invoices();

它返回一个空对象。

我做错了什么？

谢谢

更新:这是模型中的代码:

User.php
public function membership() {
        return $this->hasOne('Membership');
    }

和

Membership.php
class Membership extends \Eloquent implements BillableInterface {

    use BillableTrait;

   /**
     * @var array
     */
    protected $dates = ['trial_ends_at', 'subscription_ends_at'];

    public function user_membership() {
        return $this->belongsTo('User');
    }
}

Answer 1

如果您将其作为 JSON 或类似形式提取，这可能是从 Controller 返回的有用片段:

    public function index()
    {
        $user = auth()->user();

        if($user->hasStripeId()) {
            $invoices = $user->invoices()->map(function($invoice) {
                return [
                    'date' => $invoice->date()->toFormattedDateString(),
                    'total' => $invoice->total,
                    'download' => '/user/download/invoice/' . $invoice->id,
                ];
            });
        } else {
            $invoices = [];
        }

        return [ 'invoices' => $invoices ];
    }

在 Cashier v7.x 中测试