/**
* @param Post $post
* @param Topic $topic
*/
public function movePostToTopic(Post $post, Topic $topic)
{
$post->topic->decrement('num_posts');
$post->topic->forum->decrement('num_posts');
$post->topic_id = $topic->id;
$post->save();
$topic->increment('num_posts');
$topic->forum->increment('num_posts');
$topic->update(['last_post_id' => $post->id]);
$topic->forum->update(['last_post_id' => $post->id, 'last_post_user_id' => $post->author->id]);
}
