I know that some time has passed since the question was asked ... but when I found it during a search on Google, I think I can post the answer to help others.
So! There is documentation that allows ActiveAdmin to use Cancan for its authorization and authorization system. Here is a very simple way to add a CancanAdapter to ActiveAdmin.
In fact, they even explain how to create your own authorization adapter.
And yes, Rolify has some good documentation on how to make it work with Devise + Cancan
With these two documents, every Rails developer should be able to assemble all the parts. I will be happy to help anyone with a problem by providing more information if necessary.
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