dm-stack-overflow.rb

require 'rubygems'
require 'data_mapper'
require 'dm-timestamps'
require 'active_support/core_ext'
DataMapper::Model.raise_on_save_failure = true
class User
  include DataMapper::Resource
	property :id, String, :default => lambda {|r,p| SecureRandom.uuid}, :key=>true
	property :givenName, String, :length => 255, :default => ""
	property :surname, String, :length => 255, :default => ""
	property :isTestUser, Boolean, :default => false
	has n, :organizations
	has n, :profiles

	def default_profile
		profiles.all(:organization => nil).first
	end

end

class Profile
	include DataMapper::Resource
	property :id, Serial
	belongs_to :organization, :required => false
	belongs_to :user
	has n, :fields # if i remove this line then Profile.all doesn't puke, if I have this line then any call to Profile.all fails with stack overflow.
end

class Field
	include DataMapper::Resource
	property :id, Serial
	property :fieldType, String, :length => 200, :required => true
	property :valueType, String, :length => 200, :required => true
	property :value, String, :length => 500, :required => true
	belongs_to :profile
end

class Organization
	include DataMapper::Resource
	
	property :id,	Serial
	property :name, String
	timestamps :at

	belongs_to :user, :required=>false

end

problemcode.rb

user = User.create
user.profiles << Profiles.new
user.save
Profile.all