Hi, I'm new to this list and to rails, so I'm sorry if this subject is
repetead or too obvious.

I have two models: Topic and University, both in production. I want to make
University to inherit from Topic, but when I do this:

      University < Topic

My universities data just disapear (and reapears if the changes are undone).

I'm using mongomapper and mongodb. The code is pretty big sp I'll post then
only if necessarily. I think this must be easy to solve.

ps: I've tried the deprecated _type but didn't work.

Thanks !

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