php - 如何从 Laravel 应用程序中的 Controller 方法手动将带有特定消息的错误页面返回到 $errors 中？

Question

我对 PHP 很陌生，而且对 Laravel 也很陌生。我正在开发一个 Laravel 5.4 项目，但遇到以下问题。

我有一个名为error.blade.php的自定义错误页面:

@extends('layouts.app')

@section('content')

    <h1 class="page-header"><i class="fa fa-exclamation-triangle" aria-hidden="true" style="margin-right: 2%"></i>Riscontrati errori</h1>

    @if (count($errors) > 0)
        <div class="alert alert-danger">
            <strong>Whoops!</strong> Sono stati riscontrati errori nel tuo input.<br /><br />
            <ul>
                @foreach ($errors->all() as $error)
                    <li>{{ $error }}</li>
                @endforeach
            </ul>
        </div>
    @endif


@endsection

正如您所看到的，此类将错误消息显示到 $errors 变量中？ (它来自验证规则检索错误，那么它到底是什么？数组？还是什么？)

然后进入 Controller 类，我有这个 Controller 方法:

public function activate(ActivateRequest $request) {

    $email = $request->input('email');
    $token = $request->input('token');

    $results = DB::select('select * from pm_user where email = :email', ['email' => $email]);

    $tokenFromDB = $results[0]->token;

    if($token != $tokenFromDB) {
        // PUT AN ERROR INTO THE $errors ARRAY
        // RETURN THE error.blade.php VIEW
    }

    return 'Works!';
    // do stuff
}

所以，正如您在前面的代码片段中看到的，我有这样的情况:

if($token != $tokenFromDB) {
    // PUT AN ERROR INTO THE $errors ARRAY
    // RETURN THE error.blade.php VIEW
}

因此，在这种特定情况下，我想将文本错误消息添加到 $errors 中，并返回显示此错误消息的 error.blade.php。

如何手动完成？ (在这种情况下我没有使用验证规则，我必须通过代码来完成)

Answer 1

构建 View 时使用withErrors:

return redirect('yourErrorBladeView')
   ->withErrors(['yourErrorName'=>'yourErrorDescription']);

或者没有重定向:

return View::make('yourErrorBladeView')
    ->withErrors(['yourErrorName'=>'yourErrorDescription']);

来自 Laravel 验证错误文档 ( https://laravel.com/docs/5.4/validation#quick-displaying-the-validation-errors ):

The $errors variable is bound to the view by the Illuminate\View\Middleware\ShareErrorsFromSession middleware, which is provided by the web middleware group. When this middleware is applied an $errors variable will always be available in your views, allowing you to conveniently assume the $errors variable is always defined and can be safely used.