Laravel 5.5 -如何使用名字和姓氏登录？

use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    // ...
}

<form method="POST" action="{{ route('login') }}">
    @csrf

    <div>
        <label for="name">名字：</label>
        <input type="text" name="name" id="name" required autofocus>
    </div>

    <div>
        <label for="surname">姓氏：</label>
        <input type="text" name="surname" id="surname" required>
    </div>

    <div>
        <button type="submit">登录</button>
    </div>
</form>

use Illuminate\Support\Facades\Auth;

class LoginController extends Controller
{
    public function login(Request $request)
    {
        $credentials = $request->only('name', 'surname');

        if (Auth::attempt($credentials)) {
            // 登录成功
            return redirect()->intended('/dashboard');
        }

        // 登录失败
        return back()->withErrors([
            'name' => '登录失败，请检查名字和姓氏是否正确。',
        ]);
    }
}

Route::post('/login', 'LoginController@login')->name('login');