Criteria

criteria.rb

class Criteria

  def criteria
    @criteria ||= {:conditions => {}}
  end

  def where(args)
    criteria[:conditions].merge!(args)
    self
  end

  def limit(limit)
    criteria[:limit] = limit
    self
  end

end

user.rb

require 'mongo'
require File.expand_path 'criteria'

class User

  def self.collection
    @collection ||= Mongo::Connection.new['criteria']['users']
  end

  def self.limit(*args)
    Criteria.new.limit(*args)
  end

  def self.where(*args)
    Criteria.new.where(*args)
  end

end