Auth::user() returns null in Laravel 5.2

I have searched and found various results like these: auth()->user() is null in Laravel 5.2 Auth::user() returns null

But, mine still is not working.

Auth:user() works in the controller. but not in the Model, returns null.

the code is:

 public function scopeOwned($query){
        $query->where('user_id', '=' , Auth::user()->id);
    }

I tried dd(Auth::user()) as well. it returns null.

Any Idea?

via Chebli Mohamed