Laravel 5 身份验证::自定义控制器的尝试

当我尝试实现身份验证时出现以下错误：：try（）

我拥有的控制器看起来像

 Argument 1 passed to Illuminate'Auth'EloquentUserProvider::validateCredentials() must be an instance of Illuminate'Contracts'Auth'Authenticatable, instance of App'Models'User given

我拥有的控制器看起来像

<?php namespace App'Http'Controllers'Admin;
use App'Http'Controllers'Controller;
use App'Models'User;
use Illuminate'Support'Facades'Auth;
use Illuminate'Contracts'Auth'Authenticable;
use Illuminate'Auth'UserInterface;

class AdminAjaxController extends Controller {
    public function getLogin()
    {
        $data = array('email' => Input::get('email'), 'password' =>Input::get('password'));
        Auth::attempt($data);
    }
}