Question

I have many entities of one type which have Key with auto-generated Long ID (e.g. Person(1234)), but now I need to change those keys to have String name instead (e.g. Person(“username”)).

How should I achieve this?

Answer 1

You have two options:

1. Add a username attribute to the entity and get (using query) the entity by user name.
2. When creating the Person entity provide a key_name (Person(key_name=username, …) ), but you will need to migrate all the existing Person entities by recreating them.