使用用户名/电子邮件的Laravel身份验证不起作用

Question

我仍在学习Laravel，因此我在Google上搜索了一些可以帮助我的代码，但找不到完整的代码。我汇总了发现的内容并得到了：（不起作用）

<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use App\Providers\RouteServiceProvider;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Auth;
use App\Mail\WelcomeMail;
use Illuminate\Support\Facades\Mail;

class LoginController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles authenticating users for the application and
    | redirecting them to your home screen. The controller uses a trait
    | to conveniently provide its functionality to your applications.
    |
    */

    use AuthenticatesUsers;

    /**
     * Where to redirect users after login.
     *
     * @var string
     */
    protected $redirectTo = RouteServiceProvider::HOME;

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    protected $username;

    public function __construct()
    {
        $this->middleware('guest')->except('logout');
 
        $this->username = $this->findUsername();
    }

    public function findUsername()
    {
        $login = request()->input('username');
 
        $fieldType = filter_var($login, FILTER_VALIDATE_EMAIL) ? 'email' : 'username';
 
        request()->merge([$fieldType => $login]);
 
        return $fieldType;
    }
 
    /**
     * Get username property.
     *
     * @return string
     */
    public function username()
    {
        return $this->username;
    }

    protected function sendFailedLoginResponse(Request $request)
    {
        if (Auth::check())
        {
            return redirect()->intended('home');
        }
        else
        {
            return redirect()->back()->withErrors([
                'password' => 'Incorrect username or password'
            ]);
        }
    }
}

我的目标是使用用户名或电子邮件登录，如果凭据错误则发送错误。 我做了第一部分（当时我还没有使用最后一个功能），但是当我尝试添加第二个功能时，我把它弄坏了:)） 我没有收到错误，只是让我停留在登录页面上