Answer by thiago tanaka for Login only if user is active using Laravel

Laravel 5.8 tested. Put this code in your LoginController.php and be happy.

public function login(Request $request){    $user = User::where('username',$request->username)->first();    if( $user && !$user->active){        return redirect()->back()->with('error','the user has been desactivated');    }    $this->validateLogin($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);    }    if ($this->attemptLogin($request)) {        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);}