How to reference parent model from Carrierwave Uploader object

I want to run some methods after the upload of a file has been completed via Carrierwave. Carrierwave includes several callback methods detailed here. I'm planning on using the :store callback. That's great, but it requires me to run the callback method in the Uploader object instance. This isn't the end of the world, but I want to keep all the logic inside of my parent Model. My question is: How should I be referencing the parent model from the Uploader? I don't see anything obvious in the documentation? I suppose I could do something like ``` ParentModel.last.call_my_method_here ``` but this seems like a very brittle way to code this (not expecting a lot of requests, but still).