If you are googling “override abstract class in magento” to find my blog, probably you already tried Mage::getModel(‘module/model_abstract’) as it worked for instantiatable classes. The scenario when requires override an abstract class is overriding isActive() method in Mage_Shipping_Model_Carrier_Abstract. If Mage_Shipping_Model_Carrier_Abstract can be overridden, all carrier methods’ isActive logic can be changed without changing each instantiatable… Continue reading How to override abstract class in Magento?