Mapping relations

[farnoy]

It would be very interesting to have relations of versioned models. When modifications include id of an object, then it can be modified later, so it fails when we are recording changes to associations. The simplest way would be to define which method to call on associated object to record changes, for example: modifications would not look like
:post_id => 5
but
:post_name => "Test"
The more complicated way would be to record version of post and then revert to it. This requires keeping track of every changes, so the first way is better.