The Problem:
You’ve enabled partial refunds in the Authorizenet Model, but it’s not refunding the proper amounts.  This is due to, in my view, a bug in the core which I’ll show you how to patch!
The Solution:
What you need to do is overload the refund method in the Authorizenet model.
Create a new model that extends the [...]

Magento, Model Hide

The Problem
You’ve built a custom grid and the source collection has an ambiguous column in the where clause when applying a filter.
The Solution
I recently ran into this problem while I was building a custom grid.  The situation should be familiar to many of you.  I have a custom table storing addresses; for the region and country [...]

Magento Hide

The Problem:
You want to issue a refund, electronically, through your payment gateway from Magento.
The Solution:
By default, the community edition of Magento has refunds disabled in the Paygate Models.  In order to enable them you need to create a custom Model and overwrite a protected variable.  Refer to Part IV: Extending Models for more details on [...]

Magento, Model Hide

The Problem:
You need a custom Model to interact with a database.
The Solution:
By now you’ve read all the previous posts, right, and you want to take your custom module to the next level.  You not only have business logic to perform, but you need to read and write data to a custom database table.  No problem, let’s [...]

Data Layer, Magento, Model Hide

The Problem:
You want to expand upon or change some functionality within Magento.
The Solution:
Extend a Model!  I’m going to use a real world example here because I believe that examples are the best tools for teaching.
I was faced with a request for additional functionality in regards to the Authorize.net payment method.  Basically, the customer wanted an [...]

Magento, Models Hide