public function storeComments(CommentRequest $request, $id)
 {
     $activity = Activity::findOrFail($id);
     $comment = new ActivityComment();
     $comment->user_id = Auth::user()->id;
     $comment->content = ubbReplace($request->input('content'));
     $comment->activity_id = $id;
     $comment->save();
     return redirect('/activities/' . $id . '#comments');
 }