分表 users,admin_users,都可以登录，但是 admin_users 登录没有返回错误信息

分表 users,admin_users,都可以登录，但是admin_users 登录没有返回错误信息
`<?php

namespace App\Http\Controllers\Admin\Auth;

use Illuminate\Http\Request;
use App\Models;
use Validator;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\ThrottlesLogins;
use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;
use Auth,App\Models\AdminUser;

class AuthController extends Controller { /*	--------------------------------------------------------------------------	Registration & Login Controller
This controller handles the registration of new users, as well as the
authentication of existing users. By default, this controller uses
a simple trait to add these behaviors. Why don't you explore it?

*/

use AuthenticatesAndRegistersUsers, ThrottlesLogins;

/**
 * Where to redirect users after login / registration.
 *
 * @var string
 */
protected $redirectTo = '/';
protected $redirectPath = '/admin/home';
protected $redirectAfterLogout = '/admin/login';
protected $guard = 'admin';
protected $loginView = 'admin.auth.login';
protected $registerView = 'admin.auth.register';
/**
 * Create a new authentication controller instance.
 *
 * @return void
 */
public function __construct()
{
    $this->middleware('guest:admin', ['except' => 'logout']);
}

/**
 * Get a validator for an incoming registration request.
 *
 * @param  array  $data
 * @return \Illuminate\Contracts\Validation\Validator
 */
protected function validator(array $data)
{
    return Validator::make($data, [
        'name' => 'required|max:255',
        'email' => 'required|email|max:255|unique:admin_users',
        'password' => 'required|min:6|confirmed',
    ]);
}

/**
 * Create a new user instance after a valid registration.
 *
 * @param  array  $data
 * @return User
 */
protected function create(array $data)
{
    return AdminUser::create([
        'name' => $data['name'],
        'email' => $data['email'],
        'password' => bcrypt($data['password']),
    ]);
}

/**
 * Get the failed login message.
 *
 * @return string
 */
protected function getFailedLoginMessage()
{
    return '账号密码错误.';
}

}`

这个validator没有执行