attribute_for and build ignored for relationships

[pcastellazzi]

if you have

Fabricator(:post) do
  comments(:count => 3)
end

and do Fabricate.build(:post) or Fabricate.attributes_for(:post). The comment object is always created instead of being built or hashed as expected.

[edlebert]

+1 pppppleeeeease!

[pdelanauze]

+1

I seem to only be affected using MongoId though... No problems with active record

In my case, I have ParentObject has_one ChildObject

The following example fails at assert_no_difference:

assert_difference 'ParentObject.count', 1 do
  parent_object = Fabricate(:parent_object)
  assert_difference "ParentObject.find('#{parent_object.id}').children_objects.count", 1 do
    assert_no_difference 'ParentObject.count' do
      built_child = Fabricate.build(:child_object)
    end
    parent_object.children_objects << built_child
  end
end

But this one works:

assert_difference 'ParentObject.count', 1 do
  parent_object = Fabricate(:parent_object)
  assert_difference "ParentObject.find('#{parent_object.id}').children_objects.count", 1 do
    parent_object.children_objects << Fabricate.build(:child_object, :parent_object => parent_object)
  end
end

[paulelliott]

I am not convinced that cascading attributes_for is a good idea, so I only implemented it for builds.