I’m having troubles with class loading.
The class I want to autoload is MyPrefix_Shipping_Model_Carrier_TimeBased_Source_CustomerGroups and it’s located in the file /app/code/local/MyPrefix/Shipping/Model/Carrier/TimeBased/Source/CustomerGroups.php.
I have this defined in one of the <source_model> tags in system.xml:
Magento tries to include Mage\MyPrefix\Shipping\Model\Carrier\TimeBased\Source\CustomerGroups.php which is wrong. How do I get rid of Mage at the begining? A different XML tag maybe?