loadDatabase not working

Question

I am using groundDb in an exiting application. Right now I am simply trying to ground Meteor.users:

GroundedUsers = new Ground.Collection("Meteor.users")
  GroundedUsers.observeSource(Meteor.users.find())
if Meteor.isCordova && Meteor.status() != 'connected'
  GroundedUsers.loadDatabase()

The above did not work. So, I tried overriding find and findOne method:

Meteor.users.find = (args...) ->
    GroundedUsers.find(args...)
Meteor.users.findOne = (args...) ->
    GroundedUsers.findOne(args...)

```

Now, Meteor.users.find({_id: Meteor.userId()}).fetch() should return a document but it returns a plain object. I have apply Collection._transform to transform it into a document.

If loadDatabase() would be working, I should not have to do the same.

Any help would be nice.