I've done a research on rails versioning support and found plugins like acts_as_versioned, acts_as_versioned_association (this one have a really serious lack of documentation), simply_versioned and acts_subversive.
Some of these support versioning of associations but haven't power enough to go smoothly with polymorphics ones.
I'm wondering if any of you have implemented a solution that can control versions at models that have polymorphic associations before i start developing on my own.