Zend Frameworks Quickstart find() methods Action and View - zend-framework

Question

I am attempting to extend the Zend Framework Quickstart tutorial by trying to make an individual view for each guestbook entry, but I am missing something and keep getting errors like:
Trying to get property of non-object in C:\wamp\www\quickstart.local\application\views\scripts\guestbook\display.phtml
I get this when trying the following for my displayAction and my display.phtml:
//view
<p><?php echo $this->escape($this->entry->id); ?></strong> <a><?php echo $this->escape($this->entry->comment); ?></a><br>
<?php echo $this->escape($this->entry->email); ?></p>
//action
public function displayAction()
{
$id = $this->getRequest()->getParams('id');
$entry = new Application_Model_GuestbookMapper();
$this->view->entry = $entry->find($id);
}
And the find() function in the mapper is as is from the tutorial.
I have look all over the web and have only found tutorials that omit the quickstart guide's structure altogether. While they are all solid in their own right, I would like to find a solution to this. What am I doing wrong?
I am about mid-level with php and a beginner with zend framework. Please keep that in mind when responding.

Answer 1

If you're following the quickstart verboten, you'll want something like this
public function displayAction()
{
$id = $this->getRequest()->getParam('id');
$model = new Application_Model_Guestbook;
$mapper = new Application_Model_GuestbookMapper;
$mapper->find($id, $model);
if (null === $model->getId()) {
throw new Zend_Controller_Action_Exception(
sprintf('Guestbook entry %d not found', $id), 404);
}
$this->view->entry = $model;
}

Answer 2

in order to use GuestbookMapper with the Find() method you need to supply two items of information to the method, the id and an instance of Guestbook. The instance of guestbook is required because it has all the getters and setters mapper uses to generate the returned data.
//action updated
public function displayAction()
{
$id = $this->getRequest()->getParams('id');
$guestbook = new Application_Model_GuestBook();
$entry = new Application_Model_GuestbookMapper();
$this->view->entry = $entry->find($id, $guestbook);
}
for a detailed explaination of how this works check out chapter 9 of Survive the Deepend