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 be 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.
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
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