How do I get a list of namespaces on google app engine?

Question

I would like to make a backup of all user data in the datastore. My application is using the new namespace feature to provide multi tenanting on a per user basis (as per the example in the docs).

The bulk loader needs the namespace for each customer to download the data. I don't keep a list of users, so I can't generate the namespaces. Is there a method of detecting all the currently used namespaces?

Answer 1

There's no API to get a list of namespaces. You must keep a record of the ones you use. I use a model specifically for this.