gistfile1.txt

#!/usr/bin/env ruby

require 'pp'
require 'rubygems'
require 'mongo'

db = XGen::Mongo::Driver::Mongo.new("localhost").db("test")
original = db.collection("original")
original.remove
original.insert( { "test" => 1 } )

copied = db.collection("copied")
copied.remove
db.eval(
  'for(var c = db.original.find(); c.hasNext();) { db.copied.save(c.next()); }'
)

pp original.find_first
pp copied.find_first