HomeController.php 第 27 行中的 ErrorException：试图获取非对象的属性

Question

我在 Laravel 5.3 上，我正在使用视图，我打算将一个变量全局共享给我的所有视图，这个全局变量包含当前登录的用户信息。

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use View;

//use models
use App\profile;

class HomeController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */

    public function __construct()
    {
        $this->middleware('auth');

        View::share('user_info',profile::where('username',Auth::user()->username)->get());

    }
    public function index()
    {
        $current_page = 'home';
        return view('pages.home');
    }
}

但不幸的是它给了我这个错误

HomeController.php 第 27 行中的 ErrorException：尝试获取属性 非对象的

第27行就是这一行

View::share('user_info',profile::where('username',Auth::user()->username)->first());

问题似乎是 'Auth::user()->username' 因为如果我手动指定用户名，它会为我提供所需的集合。

有什么想法，请帮忙？

这是我用来修改身份验证内容的 AuthenticatesUsers.php。

<?php

namespace Illuminate\Foundation\Auth;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Lang;


trait AuthenticatesUsers
{
    use RedirectsUsers, ThrottlesLogins;

    /**
     * Show the application's login form.
     *
     * @return \Illuminate\Http\Response
     */
    public function showLoginForm()
    {
        return view('auth.login');
    }

    /**
     * Handle a login request to the application.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function login(Request $request)
    {
        $this->validateLogin($request);

        // If the class is using the ThrottlesLogins trait, we can automatically throttle
        // the login attempts for this application. We'll key this by the username and
        // the IP address of the client making these requests into this application.
        if ($this->hasTooManyLoginAttempts($request)) {
            $this->fireLockoutEvent($request);

            return $this->sendLockoutResponse($request);
        }

        $credentials = $this->credentials($request);

        if ($this->guard()->attempt($credentials, $request->has('remember'))) {
            return $this->sendLoginResponse($request);
        }

        // If the login attempt was unsuccessful we will increment the number of attempts
        // to login and redirect the user back to the login form. Of course, when this
        // user surpasses their maximum number of attempts they will get locked out.
        $this->incrementLoginAttempts($request);

        return $this->sendFailedLoginResponse($request);
    }

    /**
     * Validate the user login request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return void
     */
    protected function validateLogin(Request $request)
    {
        $this->validate($request, [
            $this->username() => 'required', 'password' => 'required',
        ]);
    }

    /**
     * Get the needed authorization credentials from the request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    protected function credentials(Request $request)
    {
        return $request->only($this->username(), 'password');
    }

    /**
     * Send the response after the user was authenticated.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    protected function sendLoginResponse(Request $request)
    {
        $request->session()->regenerate();

        $this->clearLoginAttempts($request);

        return $this->authenticated($request, $this->guard()->user())
                ?: redirect()->intended($this->redirectPath());
    }

    /**
     * The user has been authenticated.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  mixed  $user
     * @return mixed
     */
    protected function authenticated(Request $request, $user)
    {
        //check user role
        return redirect('/app/system/dashboard');
    }

    /**
     * Get the failed login response instance.
     *
     * @param \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    protected function sendFailedLoginResponse(Request $request)
    {
        return redirect()->back()
            ->withInput($request->only($this->username(), 'remember'))
            ->withErrors([
                $this->username() => Lang::get('auth.failed'),
            ]);
    }

    /**
     * Get the login username to be used by the controller.
     *
     * @return string
     */
    public function username()
    {
        return 'username';
    }

    /**
     * Log the user out of the application.
     *
     * @param  Request  $request
     * @return \Illuminate\Http\Response
     */
    public function logout(Request $request)
    {
        $this->guard()->logout();

        $request->session()->flush();

        $request->session()->regenerate();

        return redirect('/');
    }

    /**
     * Get the guard to be used during authentication.
     *
     * @return \Illuminate\Contracts\Auth\StatefulGuard
     */
    protected function guard()
    {
        return Auth::guard();
    }
}

Answer 1

您似乎在用户未登录时正在运行此代码，因此您可以进行检查：

View::share('user_info', auth()->check() ? profile::where('username', auth()->user()->username)->first() : null);

如果用户未登录，此代码将返回配置文件或null。

Answer 2

改变这个

if ($this->guard()->attempt($credentials, $request->has('remember'))) {
    return $this->sendLoginResponse($request);
}

到

if (Auth::attempt($credentials, $request->has('remember'))) {
    return $this->sendLoginResponse($request);
}