gistfile1.rb

class Location
  include Mongoid::Document

  field :location
  field :country
  field :state
  field :city
  field :zip_code
  field :lat, :type => Float
  field :lng, :type => Float

  belongs_to :locatable, :inverse_of => :locations
end

class User
  include Mongoid::Document

  # snip typical user fields
  
  has_one :location
  has_one :ideal_location, :class_name => "Location"
  has_one :birthplace, :class_name => "Location"
end