Appengine - How to change an entity of kind Model to Polymodel without losing existing entities

Question

I am using appengine and appenginepatch for django

I have a class defined in my models that was inheriting from db.Model. I've now changed it to polymodel.PolyModel. Since making the change, my existing entities are no longer retrievable. Is there a way to access them or convert them?

Whats the recommended procedure for changing an entity class's kind?

TIA, Tom

Answer 1

Solved using gaebar, google app engine backup and restore. Although this isnt necessarily going to be the best solution for large datastores..

Answer 2

The hassle of migrating data makes you wonder if you always want to start off with polymodel for all new entites. Answer: No. As explained here.