I am trying to implement a many to one relationship. I plan to store an array of keys (datastore entity key) of one model in the other model's entity as
The query with EQUAL filter works fine for lists of values. Make sure you pass correct value when executing this query.
For example, you can store List, if you only use this entity on the server side.
If you need this list on the client side, and you always store keys for entities of the same kind, you can store a list of
ids (List) or 'names` (List) used to create these keys. This will take much less space.