I understand why you would want to write it in the app_controler (so that all controllers might inherit from this). The problem is, there doesn't seem to be a way to declare variables outside of functions. And, as you probably are finding out, when a application controller inherits from the app_controller, the function declared in app_controller (with the variable "foo", let's say) would be overwritten. Good question, but not sure how to make it work or achieve "visibility".
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