Making an adminhtml rewrite work

Question

I have followed this tutorial from inchoo.net to get a test module to override a frontend module and it worked. I am now trying to override an adminhtml module, but without much less success.

<config>
....

<global>
    <blocks>
        <adminhtml>
            <rewrite>
                <newsletter_queue_grid_renderer_action>Ps_Newsletter_Block_Adminhtml_Newsletter_Queue_Grid_Renderer_Action</newsletter_queue_grid_renderer_action>
            </rewrite>
        </adminhtml>

        <newsletter>
            <class>Ps_Newsletter_Block</class>
        </newsletter>
    </blocks>
</global>

<admin>
    <routers>
        <adminhtml>
            <args>
                <module>
                    <Ps_Newletter before="Mage_Adminhtml">Ps_Newsletter_Adminhtml</Ps_Newletter>
                </module>
            </args>
        </adminhtml>
    </routers>
</admin>
....
</config>

-

class Ps_Newsletter_Block_Adminhtml_Newsletter_Queue_Grid_Renderer_Action
extends Mage_Adminhtml_Block_Newsletter_Queue_Grid_Renderer_Action
{
public function render(Varien_Object $row)
{
    $actions[] = array(
        'url'       =>  $this->getUrl('*/newsletter_queue/send',array('id'=>$row->getId())),
        'caption'   =>  Mage::helper('newsletter')->__('Send'),
        'popup'     =>  true
    );

    $this->getColumn()->setActions($actions);
    return parent::render($row);
}
}

I have tried to follow a similar technique to the test module, while adding the additional nodes in for it being on the admin side, then tried this tutorial, I guess i've missed something, but what am I doing wrong?

===EDIT===

I have var_dump($actions) and it is displaying expected information, however "send" is not being applied in the action section, below "preview". When I add the above code into the core file it works. So what is happing here that is different? (I thought that extending a file would output the extension value as well as block are called automatically....or so i believe)

Answer 1

You may have forgotten the 's' in the tag modules

<admin>
    <routers>
        <adminhtml>
            <args>
                <modules>
                    <Ps_Newletter before="Mage_Adminhtml">Ps_Newsletter_Adminhtml</Ps_Newletter>
                </modules>
            </args>
        </adminhtml>
    </routers>
</admin>

[EDIT] I tried to reproduce it with the following and for me it worked. You have maybe a conflict or a problem somewhere else. I cannot say without your complete code.

<?xml version="1.0"?>
<config>
    <modules>
        <Ps_Newsletter>
            <version>0.1.0</version>
        </Ps_Newsletter>
    </modules>

    <global>
        <blocks>
            <ps_newsletter>
                <class>Ps_Newsletter_Block</class>
            </ps_newsletter>
            <adminhtml>
                <rewrite>
                    <newsletter_queue_grid_renderer_action>Ps_Newsletter_Block_Adminhtml_Queue_Grid_Renderer_Action</newsletter_queue_grid_renderer_action>
                </rewrite>
            </adminhtml>
        </blocks>
        <helpers>
            <ps_newsletter>
                <class>Ps_Newsletter_Helper</class>
            </ps_newsletter>
        </helpers>
    </global>

    <admin>
        <routers>
            <adminhtml>
                <args>
                    <module>
                        <Ps_Newletter before="Mage_Adminhtml">Ps_Newsletter_Adminhtml</Ps_Newletter>
                    </module>
                </args>
            </adminhtml>
        </routers>
    </admin>
</config>

[EDIT 2] the overwrite of the class Mage_Adminhtml_Block_Newsletter_Queue_Grid_Renderer_Action is wrong, you should have a different approach regarding the actions. They are initialized in the parent class (the Newsletter one), so you have to copy the code of the parent class and skip it. For that extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Action instead of Mage_Adminhtml_Block_Newsletter_Queue_Grid_Renderer_Action. See below what I mean

class Ps_Newsletter_Block_Adminhtml_Newsletter_Queue_Grid_Renderer_Action extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Action
{
    public function render(Varien_Object $row)
    {
        $actions = array();

        if($row->getQueueStatus()==Mage_Newsletter_Model_Queue::STATUS_NEVER) {
               if(!$row->getQueueStartAt() && $row->getSubscribersTotal()) {
                $actions[] = array(
                    'url' => $this->getUrl('*/*/start', array('id'=>$row->getId())),
                    'caption'   => Mage::helper('newsletter')->__('Start')
                );
            }
        } else if ($row->getQueueStatus()==Mage_Newsletter_Model_Queue::STATUS_SENDING) {
            $actions[] = array(
                    'url' => $this->getUrl('*/*/pause', array('id'=>$row->getId())),
                    'caption'   =>  Mage::helper('newsletter')->__('Pause')
            );

            $actions[] = array(
                'url'       =>  $this->getUrl('*/*/cancel', array('id'=>$row->getId())),
                'confirm'   =>  Mage::helper('newsletter')->__('Do you really want to cancel the queue?'),
                'caption'   =>  Mage::helper('newsletter')->__('Cancel')
            );


        } else if ($row->getQueueStatus()==Mage_Newsletter_Model_Queue::STATUS_PAUSE) {

            $actions[] = array(
                'url' => $this->getUrl('*/*/resume', array('id'=>$row->getId())),
                'caption'   =>  Mage::helper('newsletter')->__('Resume')
            );

        }

        $actions[] = array(
            'url'       =>  $this->getUrl('*/newsletter_queue/preview',array('id'=>$row->getId())),
            'caption'   =>  Mage::helper('newsletter')->__('Preview'),
            'popup'     =>  true
        );

       /* Add your custom ACTIONS here */

       /* EOF */

        $this->getColumn()->setActions($actions);
        return parent::render($row);
    }
}