Issue with a Table Model - mysql

Question

I've been having a problem with a table model recently and I can't really explain why this happens. I want to select everything from a table and return it in a descending order. But when I try to display it nothing shows up:
Code:
<?php
//Will be used at a later date
namespace Blog\Model\Table;
use Zend\Db\TableGateway\TableGateway;
class Blog extends TableGateway
{
public function __construct($adapter)
{
parent::__construct('posts', $adapter);
}
public function displayPosts()
{
$adapter = $this->getAdapter();
$result = $adapter->query('SELECT * FROM `posts` ORDER BY `date_added` DESC');
return $result;
}
}
Result:
But when I add an $id argument it shows the data:
Code:
<?php
//Will be used at a later date
namespace Blog\Model\Table;
use Zend\Db\TableGateway\TableGateway;
class Blog extends TableGateway
{
public function __construct($adapter)
{
parent::__construct('posts', $adapter);
}
public function displayPosts($id = 6)
{
$adapter = $this->getAdapter();
$result = $adapter->query('SELECT * FROM `posts` WHERE `post_id` = ?', array($id));
return $result;
}
}
Result:
It's weird that it works with an argument and not without, any ideas?

Answer 1

You needed to order it by post_id
public function displayPosts()
{
$adapter = $this->getAdapter();
$result = $adapter->query('SELECT * FROM `posts`')->order(array('post_id' => 'DESC'));
return $result;
}