https://developers.google.com/appengine/docs/python/datastore/entities#Python_Ancestor_paths
To query,
1. db.GqlQuery
2. YOURMODEL.gql
3. Datastore API ( all(), fileter()...)
Entities in the Datastore form a hierarchically structured space similar to the directory structure of a file system.
[Note 20131115] this is out-of-date, need to use ndb instead, you can treat parent as table, so you need to specify it to ensure the data goes to same group
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