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Editorial Team
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Asked: 2026-06-11T18:16:40+00:00

In Magento, I want to modify the code of an Abstract class. Specifically, I

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In Magento, I want to modify the code of an Abstract class. Specifically, I want to modify the behavior of the function _getReadAdapter() of the class Mage_Core_Model_Resource_Db_Abstract.

According to this article by Alan Storm, http://alanstorm.com/magento_upgrade_rewrite_override, there are three ways to do it. Modifying the Magento’s source code is very bad and not encouraged. On the other hand, it seems to me that I cannot use Magento’s override/rewrite system, since the abstract class is neither a model, helper nor block. Is that correct?

As such, the only way to go about this is to make a copy of this particular source code at app/local/Mage, and modify the code of this new copy. Is that right?

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1 Answer

  1. Editorial Team

    Yep, using the codepool app/code/local is the way to go.

    This is because abstract classes are not handled by the Magento factories, but literally extended in the class definitions.

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