/**
* Sets the first post
*
* @param Post
* @return null
*/
public function setFirstPost(Post $post)
{
$post->setTopic($this);
$this->firstPost = $post;
}
public function isPosteriorTo(Post $post = null)
{
if (!$post) {
return true;
}
return $this->getCreatedAt()->getTimestamp() > $post->getCreatedAt()->getTimestamp();
}
