Whats the best way to access/query a DB Ref: UPDATE:
users: name, groupref : {$ref:"groups",$id:"ObjectId ..." } }
groups: name, topic, country,...,..
Assumption is that user belongs to only one group, how would I get all users for a group whose country starts with the letter A ? Country is a string.
Also, how would it change if users belonegd to more than 1 group.