GPMONGODB-242: Query a List using a result list does not work

[graemerocher]

Original Reporter: confile
Environment: MAC OSX 10.8.2
Version: 1.0.0.GA
Migrated From: http:https://jira.grails.org/browse/GPMONGODB-242

I have a User and a Book domain class. Where user has many books and the Book class belongsTo user. I query the following:

            def userBooks = Book.withCriteria {
                    eq("category", "fiction")
            }

Having the result I want to use it in the next query to find all the users who wrote fiction books:

            def users = User.withCriteria {
                    'in'(books, userBooks)
            }

This does not work. So how can I use the first query result in the second query?