public function addThread(Request $request)
 {
     if (empty($request->input('title'))) {
         return Response::json(["error" => "Title empty"]);
     }
     $thread = new Thread($request->all());
     $thread->user_id = Auth::user()->id;
     $thread->save();
     Relation::create(['thread_id' => $thread->id, 'user_id' => Auth::user()->id]);
     return Response::json($thread);
 }