Datamapper DataMapper

Hi!

I'm running into a problem where a previously saved 1:N association doesn't load in another unit of work. Basically I have two classes (ObjectA and ObjectB) and two 1:n associations (assoc1, assoc2) between these, navigable in both directions. Then I create two instances of ObjectA (a1, a2) and an instance of ObjectB (b). In a second step I connect a1 to b using assoc1 and a2 to b using assoc2, of course bi-directional. In a thrid step I first load all three again and after that try to navigate from a1 to b using the assoc1 association. This navigation doesn't retrun the expected b object. Each of the steps are done it's own unit of work and transaction.

The problem is best described with the test at the bottom of the message + attached as a file

I tried to debug it (using Eclipse DLTK) and the problem doesn't appear if I step trough the code.

I'm running Ruby 1.8.7, dm-core 0.9.10, data_objects 0.9.11 and do_sqlite3 0.9.11 on Windows XP and Ubuntu 8.10.

Best regards and thank you for any help in advance, Matevz

require "rubygems" require "test/unit" require "dm-core"

class ObjectA include DataMapper::Resource property :id, Integer, :serial => true property :field1, String has n, :assoc1 , :class_name => 'ObjectB', :child_key => [:assoc1_id] has n, :assoc2 , :class_name => 'ObjectB', :child_key => [:assoc2_id] end

class ObjectB include DataMapper::Resource property :id, Integer, :serial => true property :field2, Integer belongs_to :assoc1_back, :class_name => 'ObjectA', :child_key => [:assoc1_id] belongs_to :assoc2_back, :class_name => 'ObjectA', :child_key => [:assoc2_id] end

class AssociationLoadingTest < Test::Unit::TestCase def setup

DataMapper.setup(:default, "sqlite3::memory:")
DataMapper.auto_migrate!(:default)

end

def testProblem

DataMapper.repository(:default) do
  ObjectA.transaction do
    a1 = ObjectA.new(:field1 => '1')
    a2 = ObjectA.new(:field1 => '2')
    b = ObjectB.new(:field2 => 1)
    b.save
    a1.save
    a2.save
  end
end
DataMapper.repository(:default) do
  ObjectA.transaction do
    a1 = ObjectA.get(1)
    a2 = ObjectA.get(2)
    b = ObjectB.get(1)
    a2.assoc2 << b
    b.assoc2_back= a2
    a1.assoc1 << b
    b.assoc1_back= a1
    b.save
    a1.save
    a2.save
    puts "a1 after saving= #{a1}"
    puts "a1.assoc1 after saving = #{a1.assoc1.first}"
  end
end

DataMapper.repository(:default) do
  ObjectA.transaction do
    a1 = ObjectA.get(1)
    a2 = ObjectA.get(2)
    b = ObjectB.get(1)

    assert_equal(1, a2.assoc2.size)
    assert(a2.assoc2.first.equal?(b))
    assert(a2.assoc2.first.assoc2_back.equal?(a2))

    # all three asserts below fails for unknown reason:
    # the instance of B is not demand-loaded
    puts "a1 after reloading= #{a1}"
    puts "a1.assoc1 after reloading= #{a1.assoc1.first}"
    assert(a1.assoc1.first.equal?(b))
    assert_equal(1, a1.assoc1.size)
    assert(a1.assoc1.first.assoc1_back.equal?(a1))
  end
end

end end