How to set remember_token NULL in laravel - laravel-4

Question

I have an application in laravel which have a Users table with a column remember_tokenand the User model has the three function mentioned here: http://laravel.com/docs/upgrade#upgrade-4.1.26
getRememberToken(), setRememberToken($value), getRememberTokenName()
In my login form, I have email, password and a remember me checkbox field. What I want is if user ticked that Remember Me checkbox, then only laravel should remember the user, else it should set the column as NULL.
But at the moment it is remembering it all the time, and I don't know how to set it to NULL.
My doLogin function code is below:
public function doLogin()
{
$rules = array(
'email' => 'required|email',
'password' => 'required|alphaNum|min:7'
);
$validator = Validator::make(Input::all(), $rules);
if ($validator->fails()) {
return Redirect::to('login')
->withErrors($validator)
->withInput(Input::except('password'));
} else {
$remember = Input::get('remember');
$userData = array(
'email' => Input::get('email'),
'password' => Input::get('password')
);
// attempt to do the login
if (Auth::attempt($userData, true)) {
return Redirect::to('/');
} else {
return Redirect::to('login')->with('loginError', 'Incorrect email or password.');
}
}
}
Please tell me what modification I need to make so that it set remember_token as null in database when remember checkbox is not ticked by user.

Answer 1

To quote the documentation
If you would like to provide "remember me" functionality in your
application, you may pass true as the second argument to the attempt
method, which will keep the user authenticated indefinitely (or until
they manually logout).
You are hard coding the second parameter to true instead of using the value taken from the user input.
You are already setting the input to the $remember variable, so try passing that instead.
Auth::attempt($userData, $remember)