Question

I have a List kind, and an User kind. I’m currently using IntegerProperty to associate User IDs with Lists, but I want to switch to ReferenceProperty. Currently, I’m using this code (with IntegerProperty):

db.GqlQuery("SELECT * FROM List WHERE UserID = :1", userid)

How should the code with ReferenceProperty look like? The script has the numeric ID of User (userid).

Answer 1

First, you need to construct a key from your ID. You can do that like this (presuming your User entity has no parent):

user_key = db.Key.from_path('UserInfo', user_id)

Now you can use it in a query just as you would anything else:

db.GqlQuery("SELECT * FROM List WHERE user_key = :1", user_key)

Or equivalently with a Query instead of GQL:

List.all().filter("user_key =", user_key)