How to display Custom order attribute in Magento back end - magento

Question

I'm using Magento 1.7 - I am fairly new to Magento module development.
I have created a new Order custom EAV attribute called Deliverydate which the customer will enter on the Shopping Cart page. I created a custom module and installer script, and can see it in the eav_attribute table.
$installer = $this;
$installer->startSetup();
$setup = new Mage_Eav_Model_Entity_Setup('core_setup');
$setup->addAttribute('order', 'deliverydate', array(
'position' => 1,
'input' => 'text',
'backend_type' => 'varchar',
'type' => 'varchar',
'label' => 'Choose delivery date',
'visible' => 1,
'required' => 0,
'user_defined' => 1,
'global' => 1,
'visible_on_front' => 1,
));
$installer->endSetup();
But I've read many sources and can't figure out how to
1) Save the value entered by the customer.
2) Retrieve the value for display in the Admin.
I have read on these tutorials about Observers but can't seem to get one to work:
Here's my config.xml file
<?xml version="1.0"?>
<config>
<modules>
<Mycompany_Deliverydate>
<version>0.1.0</version>
</Mycompany_Deliverydate>
</modules>
<global>
<resources>
<deliverydate_setup>
<setup>
<module>Mycompany_Deliverydate</module>
<class>Mycompany_Deliverydate_Model_Resource_Mysql4_Setup</class>
</setup>
<connection>
<use>core_setup</use>
</connection>
</deliverydate_setup>
</resources>
<events>
<checkout_type_onepage_save_order>
<observers>
<Deliverydate_observer>
<type>singleton</type>
<class>deliverydate/observer</class>
<method>Deliverydate</method>
</Deliverydate_observer>
</observers>
</checkout_type_onepage_save_order>
</events>
</global>
</config>
And my Observer.php file, most of which I borrowed from another tutorial / question on this site.
class Mycompany_Deliverydate_Model_Observer {
public function Deliverydate($observer) {
$event = $observer->getEvent();
$order = $event->getOrder();
$order->setDeliverydate(Mage::app()->getRequest()->getPost('delivery_date'));
}
}
I don't think this is being entered at all - I put in a throw new Exception and went through an entire order without ever seeing the exception. In any case I am not sure I'm checking the right event - checkout_type_onepage_save_order - when is this fired? And I don't know where the setDeliverydate() function would be defined but as I said this sort of comes from another source and it wasn't defined there either.
And where does the value entered get stored?

Answer 1

Please check this following post, It would help you. If it doesn't uplift you from this issue, please comment here
http://chillydraji.wordpress.com/2014/03/03/how-to-create-new-attribute-to-order-in-magento/