@DominicPixie "Meanwhile magento is extremely unlikely to decoupled from zend" this aged very poorly LOL

This is correct but misleading, for code composition and following the SRP an observer should be calling the logic not containing the logic. Function abc should exist in a third class that both the controller and the observer (the entry points for the logic) call individually.

@coinhndp clear your config cache

For those who are looking these are the path's: admin/url/use_custom and admin/url/custom mentioned in the more recent answer from chris rogers.

Thank you @RomanSnitko

This is the first answer that shows up and blatantly incorrect. It would be helpful if you deleted this answer.

not only are you hard coding foreign key values from other tables but you're not specifying a reference to the store which is the entire purpose of the question. Terrible answer.