Question

我正在制作的网络应用程序存在问题。关键是，对于用户来说，如果他打算创建一个出发日期（如果他已经有一个），则显示如下错误消息：＆＃34;哦，你已经签了出发日期。删除先前创建的出发日期以指定新的出发日期！＆＃34;

DepartureController.php

 public function store(Request $request)
{
    $request->validate([
        'departure_date' => 'required|date|after:yesterday',
        'location' => 'required|max:1|integer|',


    ]);

    $date = Carbon::parse($request->departure_date);
    $LocationUsers = new LocationUser();
    $LocationUsers->user_id = request()->user()->id;
    $LocationUsers->departure_date = $date;
    $LocationUsers->location_id = $request->location;
    $LocationUsers->save();

    session()->flash('success', 'Departure added succesfully!');
    return redirect('departure/create');
}

用户模型

 public function daysUntilDeparture()
{
    if ($this->location()->count() < 1) {
        return "No departure date has been given";
    }

    $location = $this->location[0];

    $userLocation = LocationUser::where('user_id', $this->id)
        ->where('location_id', $location->id)
        ->first();

    $departure_date = $userLocation->departure_date;
    return $departure_date->diffInDays(Carbon::now());
}

Answer 1

您可以创建自己的验证规则（https://laravel.com/docs/5.6/validation#custom-validation-rules）

例如，您的规则可能如下所示：

use Illuminate\Contracts\Validation\Rule;

class CurrentDeparture implements Rule
{
    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        return is_null(LocationUser::where('user_id', request()->user()->id)->first());
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'Uh oh, you have already made a departure date. Delete the previously made departure date to assign a new one!';
    }
}

您的验证将是：

$request->validate([
    'departure_date' => [new CurrentDeparture, 'required', 'date', 'after:yesterday'],
]);

Laravel限制离开1

1 个答案: