<config>
	<global>
		<models> [1]
			<sales> [2]
				<rewrite>
					<order_item>Namespace_Module_Model_Sales_Order_Item</order_item> [3]
				</rewrite>
			</sales>
		</models>
	</global>
</config>

[1] Depending on object type “models”, “helpers” or “blocks”
[2] Module shorthand
[3] The tag is the class to override, the content is the full name of the replacement class.

You can download the cheat-sheet from:
http://www.blog.magepsycho.com/magento-cheatsheet/

Cheers!

You’re using the full original Item.php file contents anyways, so if that’s updated at some point you’ll still need to update your override also. So what’s the advantage in going this route?

http://stackoverflow.com/questions/7683653/custom-sort-list-in-magento-grid

I tried this without any results. What am I missing?

app/code/local/Personal/Checkout/etc/config.xml

0.0.1

Personal_Checkout_Model_Type_Multishipping_State
`

we need to have cart like this
e.g.
Subtotal £270.50 (Note: product prices in a site are tax inclusive)
tax -£40.29 ((after deduction £230.21) Note: calculation should be done like http://www.digita.com/taxcentral/home/calculators/vatcalculator/default.asp it’s done her for 17.5%(tick) Inclusive of VAT, also, kindly notice that i want to deduct tax for some countries and for some it won’t be deducted . I’ve csv ready for the same. )
delievery charge £18.00
Final Total £248.21

Can you pls guide how can i apply above like tax imple in magento?

can i get any plugin ? or orverrride fuction fetch in model class , how?

For example, I had to override the password length check in

class

Mage_Customer_Model_Customer_Attribute_Backend_Password

My config file:

*snip*

MyCompany_Customer_Model_Customer_Attribute_Backend_Password

*snip*

class Mage_Directory_Model_Currency extends Mage_Core_Model_Abstract
{ }

In my config.xml file, I have made the following change:

…..

MyCompany_MyModule_Model_Currency

……

But it is not working! I’m missing something?

Regards,

Seems like Branko got it covered already at ActiveCodeline, Overrider module, which shows it nicely how to do it ( http://activecodeline.com/modules/ ).