     users = @users.splice 0
 
     for user in usersToRemove
-      users = removeUser users, user
+      users = excludeUser users, user
 
     @update $set: { users }, callback
 


  addUser = (users, user, owner)->

    newUsers = removeUser users, user
    newUsers.push { id: user.getId(), owner }

    return newUsers


    return owner


  excludeUser = (users, user)->

    userId   = user.getId()
    newUsers = []
