未定义的变量:Laravel中的错误 [英] Undefined variable: errors in Laravel

问题描述

当我想在laravel项目中注册用户时，页面总是显示

When I want to register a user in my laravel project, the page always says

未定义变量:错误(查看:/var/www/resources/views/auth/register.blade.php)"

Undefined variable: errors (View: /var/www/resources/views/auth/register.blade.php)"

根据Laravel文档，应始终自动设置$errors:

According to the Laravel documentation, $errors should always automatically be set:

因此，需要注意的是，在每个请求的所有视图中，始终都会使用$ errors变量，这使您可以方便地假定$ errors变量始终处于定义状态并且可以安全地使用.

So, it is important to note that an $errors variable will always be available in all of your views on every request, allowing you to conveniently assume the $errors variable is always defined and can be safely used.

在使用时，我在每个视图上都使用此功能:

I have this on on every view when I use:

@if (count($errors) > 0)
    <div class="alert alert-danger">
        <ul>
            @foreach ($errors->all() as $error)
                <li>{{ $error }}</li>
            @endforeach
        </ul>
    </div>
@endif

或其他任何我想使用$errors变量的方式.

or any other way when I want to use the $errors variable.

这是为什么?我以前从未遇到过这个问题.

Why is this? I never had this problem before.

有人可以帮我吗?

推荐答案

您应确保在web的middlewareGroups属性的app/Http/Kernel.php中，您拥有:

You should make sure that in app/Http/Kernel.php in middlewareGroups property for web you have:

\Illuminate\View\Middleware\ShareErrorsFromSession::class,

在此数组中.将其与 https://github.com/laravel/laravel/blob/master/app/Http/Kernel.php

编辑

似乎您需要为要使用的路由添加'middleware' => 'web'或将\Illuminate\View\Middleware\ShareErrorsFromSession::class,放入$middleware属性数组

It seems you need to add 'middleware' => 'web' for route you are using or put \Illuminate\View\Middleware\ShareErrorsFromSession::class, into $middleware property array

在routes.php文件内部，尝试在以下代码段中创建路由

Inside of the routes.php file try to create your routes within the following block

Route::group(['middleware' => ['web']], function () {
    //routes here
});

更新版本的laravel应用程序

请注意，如果两次使用web中间件，也可能会遇到问题. Laravel应用程序 5.2.27 发生了变化(请不要将其与当前使用的Laravel框架相混淆-您可以使用Laravel框架(例如5.2.31)，但在5.2版中具有Laravel应用程序. 24)，其中web中间件自动应用于所有路由.因此，如果出现问题，您应该打开app/Providers/RouteServiceProvider.php文件并验证其内容.

Be aware that you might run into problems also in case you use web middleware twice. There was a change in Laravel application 5.2.27 (don't confuse it with Laravel framework you use at the moment - you might use Laravel framework for example 5.2.31 but have Laravel application in version 5.2.24) in which web middleware is applied automatically for all routes. So in case of problems, you should open your app/Providers/RouteServiceProvider.php file and verify its content.

您也可以在这里进行比较:

You can compare it also here :

• 用于Laravel应用程序5.2.24的RouteServiceProvider

用于Laravel应用程序5.2.27的RouteServiceProvider

如果您有较新的版本(自动应用web中间件)，则不应再在routes.php中使用web中间件，否则应修改RouteServiceProvider方法以不应用web组中间件.否则，如果web中间件组自动应用在此提供程序中，并且在routes.php中也使用了它，则可能会得到非常意外的结果.

In case you have newer version (that applies web middleware automatically), you shouldn't use web middleware in routes.php anymore or you should modify your RouteServiceProvider method to not apply web group middleware. Otherwise if web middleware group is automatically applied in this provider and you use it also in routes.php you might get very unexpected results.

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