public function getMostRecentPostAttribute()
{
$post = null;
$topicIDs = Topic::select('id')->where('section_id', $this->id)->get()->toArray();
$postID = Post::select('id')->whereIn('topic_id', $topicIDs)->orderBy('id', 'desc')->get()->first();
if ($postID) {
$post = Post::find($postID->id);
}
return $post;
}