protected function filterDiscussionVisibleTo($ids, User $actor)
{
// For each post ID, we need to make sure that the discussion it's in
// is visible to the user.
if ($actor) {
$ids = Discussion::join('posts', 'discussions.id', '=', 'posts.discussion_id')->whereIn('posts.id', $ids)->whereVisibleTo($actor)->get(['posts.id'])->lists('id');
}
return $ids;
}
