One-to-many and many-to-many relationships - google-appengine-python. Python - One-to-many relationships in datastore. Modeling relationships in App Engine. Posted by Nick Johnson | Filed under python, app-engine, datastore, relational-modelling One source of difficulty for people who are used to relational databases - and certain ORMs in particular - is how to handle references and relationships on App Engine.
There's two basic questions here: First, what does a relationship entail, in any database system? And second, how do we use them in App Engine?