Re: [Modeling-users] Models and import order

[Sebastien B. <sbi...@us...>]

        Hi Mario,

  Okay, got it: this happens whenever you import a class with sub-classes at
  first. Current solution is: first import a class without sub-classes :/

Can you confirm that you used the '-B'/--base generation scheme? The
-C/compact scheme does not suffer from this as far as I can see.

  Sorry, this is definitely a bug, and this is confusing indeed. I'm
  gonna review the python generation process and post here when this is
  corrected. If you find some time, could you fill in a bug report?

-- S=E9bastien.


Mario Ruggier <ma...@ru...> wrote:
> Hi all,
>=20
> I have been surprised with an ImportError ("cannot import name <CustomCla=
ss>")
> that occurs only for some custom object Classes.
>=20
> I have traced it down to the order that the imports are declared
> in the module that uses the model. In my particular case, I have
> the following pymodel (sketch):
>=20
> model.entities =3D [
>    Entity('A_1', ...),
>    Entity('A_2', ...),
>    Entity('A_2sub', parent=3D'A_2' ...),
>    Entity('B_1', ...),
>    Entity('B_1sub', parent=3D'B_1', ...),
> ]
>=20
> model.associations=3D[
>    Association('A_2','A_1', ... ),
>    Association('B_1','B_1sub', ...),
> ]
>=20
> In the module that uses the model, if I import in the order:
>=20
> from pympack.B_1 import B_1
> from pympack.B_1sub import B_1sub
> from pympack.A_1 import A_1
> from pympack.A_2 import A_2
> from pympack.A_2sub import A_2sub
>=20
> I get the ImportError: cannot import name B_1
> However, all works fine if I change the import order to:
>=20
> from pympack.A_1 import A_1
> from pympack.A_2 import A_2
> from pympack.A_2sub import A_2sub
> from pympack.B_1 import B_1
> from pympack.B_1sub import B_1sub
>=20
> I found this very confusing, especially given also that the
> "A" and "B" sets of classes exist in distinct inheritance
> hierarchies, and with no relations across the hierarchies.
> They just happen to be two distinct models, in the same model!
>=20
> Is there something I do not see here, or is this a bug?
> Is there a relation, or are there constraints to respect, between
> the import order and entity definition order in a model?
> (BTW, I am using last CVS version)
>=20
> mario