Update a record through model in zend framework - php

Question

I am having a model and would need to update the record. every time $count ($count = $post->save()) is being NULL. how is it possible to know whether this record saved or not. if saved, i want to display the following message 'Post updated' and if not the other message 'Post cannot update'.
This is always going to the else port. how can i know model updated correctly or not?
$post = new Application_Model_Post($form->getValues());
$post->setId($id);
$count = $post->save();
//var_dump($count); exit;
if ($count > 0) {
$this->_helper->flashMessenger->addMessage('Post updated');
} else {
$this->_helper->flashMessenger->addMessage('Post cannot update');
}
Application_Model_Post code is as below,
class Application_Model_Post
{
/**
* #var int
*/
protected $_id;
/**
* #var string
*/
protected $_title;
/**
* #var string
*/
protected $_body;
/**
* #var string
*/
protected $_created;
/**
* #var string
*/
protected $_updated;
/**
* #var Application_Model_PostMapper
*/
protected $_mapper;
/**
* Class Constructor.
*
* #param array $options
* #return void
*/
public function __construct(array $options = null)
{
if (is_array($options)) {
$this->setOptions($options);
}
}
public function setOptions(array $options)
{
$methods = get_class_methods($this);
foreach ($options as $key=> $value) {
$method = 'set'.ucfirst($key);
if (in_array($method, $methods)) {
$this->$method($value);
}
}
return $this;
}
public function setId($id)
{
$this->_id = $id;
return $this;
}
public function getId()
{
return $this->_id;
}
public function setTitle($title)
{
$this->_title = (string) $title;
return $this;
}
public function getTitle()
{
return $this->_title;
}
public function setBody($body)
{
$this->_body = $body;
return $this;
}
public function getBody()
{
return $this->_body;
}
public function setCreated($ts)
{
$this->_created = $ts;
return $this;
}
public function getCreated()
{
return $this->_created;
}
/**
* Set data mapper.
*
* #param mixed $mapper
* #return Application_Model_Post
*/
public function setMapper($mapper)
{
$this->_mapper = $mapper;
return $this;
}
/**
* Get data mapper.
*
* Lazy loads Application_Model_PostMapper instance if no mapper
* registered.
*
* #return Application_Model_PostMapper
*/
public function getMapper()
{
if (null === $this->_mapper) {
$this->setMapper(new Application_Model_PostMapper());
}
return $this->_mapper;
}
/**
* Save the current post.
*
* #return void
*/
public function save()
{
$this->getMapper()->save($this);
}
public function getPost($id)
{
return $this->getMapper()->getPost($id);
}
/**
* Update the current post.
*
* #return void
*/
public function update($data, $where)
{
$this->getMapper()->update($data, $where);
}
/**
* Find a post.
*
* Resets entry state if matching id found.
*
* #param int $id
* #return Application_Model_Post
*/
public function find($id)
{
$this->getMapper()->find($id, $this);
return $this;
}
/**
* Fetch all posts.
*
* #return array
*/
public function fetchAll()
{
return $this->getMapper()->fetchAll();
}
}
getMapper refers to the class Application_Model_PostMapper.
class Application_Model_PostMapper
{
public function save(Application_Model_Post $post)
{
$data = array(
'title'=>$post->getTitle(),
'body'=>$post->getBody(),
'created'=>$post->getCreated()
);
if (null === ($id = $post->getId())) {
unset($data['id']);
$data['created'] = date('Y-m-d H:i:s');
$post->setId($this->getDbTable()->insert($data));
} else {
$this->getDbTable()->update($data, array('id = ?'=>$id));
}
}
public function getDbTable()
{
if (null === $this->_dbTable) {
$this->setDbTable('Application_Model_DbTable_Post');
}
return $this->_dbTable;
}
}
Class of Application_Model_DbTable_Post
class Application_Model_DbTable_Post extends Zend_Db_Table_Abstract
{
protected $_name = 'posts';
}
Let me know if anything is incorrect. i am a newbie to zend and did thsi while referring the zend site. http://framework.zend.com/manual/1.12/en/learning.quickstart.create-model.html

Answer 1

you can extend your script like this. zend dbtable triggers the Zend_Db_Exception on any error during any insert or update.
class Application_Model_PostMapper
{
public function save(Application_Model_Post $post)
{
$data = array(
'title'=>$post->getTitle(),
'body'=>$post->getBody(),
'created'=>$post->getCreated()
);
try {
if (null === ($id = $post->getId())) {
unset($data['id']);
$data['created'] = date('Y-m-d H:i:s');
$post->setId($this->getDbTable()->insert($data));
} else {
$this->getDbTable()->update($data, array('id = ?'=>$id));
}
} catch (Zend_Db_Exception $e) {
// error thrown by dbtable class
return $e->getMessage();
}
// no error
return true;
}
}
now you can check like this
$post = new Application_Model_Post($form->getValues());
$post->setId($id);
$isSaved = $post->save();
if ($isSaved === true) {
$this->_helper->flashMessenger->addMessage('Post updated');
} else {
// error
// $isSaved holds the error message
$this->_helper->flashMessenger->addMessage('Post cannot update');
}