Question

I have a datastore entity called Game and two fields in it called playerOne and playerTwo. Either of these fields stores a username.

I need to search on the Game entity and return a MAX of 30 games where the username can be either playerOne OR playerTwo…

So in a relational database you would go:
SELECT * FROM Game WHERE playerOne=’username’ OR playerTwo=’username’ LIMIT 30

But in big table you can’t filter on more than one field! I can’t fetch 10 from one and 10 from the other as the number from each can be variable and in createdDate order.

How would you do this in your datastore?

Answer 1

The quick answer is create a StringListProperty that contains [player_a, player_b] and then simply use the multi-value index made out of that:

games = Game.all().filter("players =", player_find)