Rails - Mar 2009 - Validations on parent and accepts_nested_attributes_for don't comply?

Hello,

I''ve got two models:

class ProductGroup < ActiveRecord::Base
   has_many :fields, :dependent => :destroy
   accepts_nested_attributes_for :fields
end

class Field < ActiveRecord::Base
   belongs_to :product_group
   validates_presence_of :product_group
end


Now when I try something like this:
ProductGroup.create(:title => "foo", :fields_attributes =>
{"new_1" =>
{:title => "bar"}})
it''ll fail because of the validates_presence_of :product_group 
validation. Since the field is being build by the 
product_group.fields.build function (in 
assign_nested_attributes_for_collection_association of the 
NestedAttributes module) the product reference of field is not set 
because the ProductGroup instance is not saved yet, and hence the 
validation fails.

Now if I remove the validation all goes well and both objects are saved 
as they should.

Is there a better / other way to make sure a Field can only be saved 
when it has a reference to a ProductGroup while still being able to use 
the nested attributes functionality?

Thanks,

Ronald

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