dm-associations-will-not-save.rb

#!/usr/bin/env ruby

require 'rubygems'

gem 'dm-core', '~>0.9.9'
require 'dm-core'

DataMapper::Logger.new(STDOUT, :debug)
DataMapper.setup(:default, 'sqlite3::memory:')

class Foo
  include DataMapper::Resource

  property :id, Serial
  property :num, Integer
  belongs_to :bar
end

class Bar
  include DataMapper::Resource
  
  property :id, Serial
  property :num, Integer
  has 1, :foo
end

DataMapper.auto_migrate!

foo = Foo.create(:num => 10)
bar = Bar.create(:num => 1)
foo.bar = bar
foo.save or raise "failed to save"

foo.bar.num = foo.num
raise "not dirtied" unless foo.bar.dirty?
foo.bar.save or raise "failed to save"
foo.bar.reload
puts "***** Failed to save using association" unless foo.bar.num == foo.num

bar = Bar.get(foo.bar_id)
bar.num = foo.num
bar.save or raise "failed to save"
bar.reload
puts "***** Failed to save using model" unless bar.num == foo.num

class Foo
  def bar
    @bar ||= Bar.get(self.bar_id)
  end
end

foo.num = 11
foo.save
foo.bar.num = foo.num
raise "not dirtied" unless foo.bar.dirty?
foo.bar.save or raise "failed to save"
foo.bar.reload
puts "***** Failed to save using hacked association" unless foo.bar.num == foo.num