Expando Model in Django?

It's possible, but it would be a kludge of epic proportions. GAE uses a different database design known as a column-based database, and the Django ORM is designed to link with relational databases. Since technically everything in GAE is stored in one really big table with no schema (that's why you don't have to syncdb for GAE applications), adding arbitrary fields is easy.

With relational databases, where each table stores exactly one kind of data (generally) and has a fixed schema, arbitrary fields aren't so easy.

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