Manage multiple Role in laravel

I have created a roles and group table:

Group : Car Role : Owner,Customer,Agent.

I have table where I include above things :

Group table

Role table

Role Group Mapping table

I have login screen in laravel default I just change a login layout using show_login() override a method. I want to implement role base login. Views are restricted to role (Owner,Agent,Customer).

Login Controller:

<?php
namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;

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 = '/dashboard';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }
    public function showLoginForm()
    {
        return view('customlogin');
    }


}

via Chebli Mohamed