$t->is($topic->getNbPosts(), 2, 'Adding a second message increments the topic number of posts');
$t->is($topic->getNbReplies(), 1, 'A topic can calculate its number of replies based on its number of posts');
$t->is($topic->getUpdatedAt('U'), $msg2->getCreatedAt('U'), 'Adding a second message changes the latest reply date of the topic to the message creation date');
$t->is($topic->getLatestPost()->getAuthorName(), $user2->getUsername(), 'Adding a second message changes the latest reply author name to the message author name');
sleep(1);
$msg3 = new sfSimpleForumPost();
$msg3->setTopicId($topic->getId());
$msg3->setUserId($user3->getId());
$msg3->save();
$topic = sfSimpleForumTopicPeer::retrieveByPk($topic->getId());
$t->is($topic->getNbPosts(), 3, 'Adding a third message increments the topic number of replies');
$t->is($topic->getUpdatedAt('U'), $msg3->getCreatedAt('U'), 'Adding a third message changes the latest reply date of the topic to the message creation date');
$t->is($topic->getLatestPost()->getAuthorName(), $user3->getUsername(), 'Adding a third message changes the latest reply author name to the  message author name');
$t->diag('Updating a message');
sleep(1);
$msg1 = sfSimpleForumPostPeer::retrieveByPk($msg1->getId());
$msg1->setTitle('this is a test');
$msg1->save();
$topic = sfSimpleForumTopicPeer::retrieveByPk($topic->getId());
$t->is($topic->getNbPosts(), 3, 'Updating a message doesn\'t change the topic post count');
$t->is($topic->getUpdatedAt('U'), $msg3->getCreatedAt('U'), 'Updating a message doesn\'t change the topic\'s last update date');
$t->is($topic->getLatestPost()->getId(), $msg3->getId(), 'Updating a message doesn\'t change the topic\'s latest reply');
$forum = sfSimpleForumForumPeer::retrieveByPk($forum->getId());
$t->is($forum->getNbPosts(), 3, 'Updating a message doesn\'t change the forum\'s post count');
$t->is($forum->getUpdatedAt('U'), $msg3->getCreatedAt('U'), 'Updating a message doesn\'t change the forum\'s last update date');
$t->is($forum->getLatestPost()->getId(), $msg3->getId(), 'Updating a message doesn\'t change the forum\'s last reply');
$t->diag('Updating the topic');
sleep(1);
$topic = sfSimpleForumTopicPeer::retrieveByPk($topic->getId());
$topic->setTitle('this is another test');
$topic->save();
 public function executeDeletePost()
 {
     $post = sfSimpleForumPostPeer::retrieveByPk($this->getRequestParameter('id'));
     $this->forward404Unless($post);
     $topic = $post->getTopic();
     if ($topic->countsfSimpleForumPosts() == 1) {
         // it is the last post of the topic, so delete the whole topic
         $topic->delete();
         $forum = $post->getsfSimpleForumForum();
         $this->redirect($this->getModuleName() . '/forum?forum_name=' . $forum->getStrippedName());
     } else {
         // delete only one message and redirect to the topic
         $post->delete();
         $this->redirect($this->getModuleName() . '/topic?id=' . $topic->getId() . '&stripped_title=' . $topic->getStrippedTitle());
     }
 }