Calling sort results in no values being retrieved

[zhikin]

Probably caused by the difference in id and _id which corrupts the values retrieved. The retrieval does produce imaginary items (resulting in the total number of items being correct), but the items are all undefined.

Tested with a derby server, and without mongodb, sort works.

[zhikin]

Actually fails in other retrieval cases too. Maybe the function model.add produces incompatible ids