使用Laravel Cashier和Jenssegers MongoDB在Stripe中更新订阅后，订阅不会在数据库中更新

我无法在MongoDB数据库中更新我的新订阅。我正在使用Laravel Cashier，Stripe和Jenssegers MongoDB。

在条纹仪表板中，已成功将用户添加为客户和订户。

这是错误：     [23:24:17] LOG.error：在null上调用成员函数prepare（）     {“ userId”：“ 4ec1b45d36623t2269477d0 ...

错误存在的地方：

                return true;
        }

        $statement = $this->getPdo()->prepare($query);

        $this->bindValues($statement, $this->prepareBindings($bindings));

这是我的控制器：

namespace App\Http\Controllers;

use App\Plan;
use App\User;
use Exception;
use Illuminate\Http\Request;





class CheckoutController extends Controller
{
 /**
 * The collection name
 *
 * @var array
 */

public function checkout($plan_id)
{
    $plan = Plan::findOrFail($plan_id);
    $intent = auth()->user()->createSetupIntent();
    return view('billing.checkout', compact('plan', 'intent'));
}

public function process(Request $request)
{
    $plan = Plan::findOrFail($request->input('billing_plan_id'));
    try {
        auth()->user()->newSubscription($plan->name, $plan->stripe_plan_id)- 
>create($request->input('payment-method'));
        return redirect()->route('billing')->withMessage('Subscribed Successfully');
    } catch (Exception $e) {
        return redirect()->back()->withError($e->getMessage());
    }
}

这是我的用户模型：

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Database\Eloquent\Model;
use Jenssegers\Mongodb\Auth\User as Authenticatable;
use Laravel\Cashier\Billable;
use Illuminate\Foundation\Auth;

class User extends Authenticatable
{

use  Billable, Notifiable;


protected $connection = 'mongodb';


/**
 * The attributes that are mass assignable.
 *
 * @var array
 */
 protected $fillable = [
    'name', 'email', 'username', 'password', 'phone', 'last_login_at', 
'last_login_ip',
];
/**
 * The collection name
 *
 * @var array
 */
 protected $table = 'users';



 /**
  * The attributes that are mass assignable.
  *
  * @var array
  */
   protected $dates = ['deleted_at'];
 /**
  * The attributes that should be hidden for arrays.
  *
  * @var array
  */
 protected $hidden = [
    'password', 'remember_token',
];

/**
 * The attributes that should be cast to native types.
 *
 * @var array
 */
protected $casts = [
    'email_verified_at' => 'datetime',
];

}

这是我的计划模型：     命名空间应用；

use Jenssegers\Mongodb\Eloquent\Model;


/**
 * @method static findOrFail($plan_id)
 */
class Plan extends Model
{

 protected $fillable = [
     'name',
    'price',
    'stripe_plan_id'
];

}

这是我的订阅迁移：

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Migrations\Migration;
use Jenssegers\Mongodb\Schema\Blueprint;





class CreateSubscriptionsTable extends Migration
{
/**
 * The name of the database connection to use.
 *
 * @var string
 */
protected $connection = 'mongodb';



public function up()
{
    Schema::create('subscriptions', function (Blueprint $collection) {
        $collection->bigIncrements('id');
        $collection->unsignedBigInteger('userid');
        $collection->string('name');
        $collection->string('stripe_id');
        $collection->string('stripe_status');
        $collection->string('stripe_plan')->nullable()->change();
        $collection->integer('quantity')->nullable()->change();
        $collection->timestamp('trial_ends_at')->nullable();
        $collection->timestamp('ends_at')->nullable();
        $collection->timestamps();
        $collection->index(['user_id', 'stripe_status']);
    });
}

/**
 * Reverse the migrations.
 *
 * @return void
 */
public function down()
{
    Schema::dropIfExists('subscriptions');
}
}

请帮助我找出此问题的根源以及如何解决。