On Thu, 2007-02-22 at 01:38 +0100, enquest wrote:
> I have two models for testing purpose... I realy need to solve this
> problem. If not I will have to stop using Django what would be a pitty.
> But I can't spend an other day searching!!!! This problem occurs on a
> Debian apache2 server (fresh install)
>
> model 1
> from django.db import models
> from bar.models import Test
Try changing this to
from bar import models as bar_models
and later on (in the model)
bar = models.ForeignKey(bar_models.Test)
I'm not guaranteeing that will fix anything, but there is one very
tricky import-related bug in the way we work out relations between
models (and cache the models). It is being worked on (by me), but hasn't
been fixed yet.
If you care about the details, the reason this might work is that by
changing the import in this way, you are not forcing Python to look
inside the bar.models module to resolve the Test name at import time.
Instead, you are just ensuring that bar.models is in the current
namespace (you have to import as something other than "models", since
you have already imported django.db.models under that name). This leaves
the name lookup (bar_models.Test, in my example) until later in the
show, when all the imports and model loading has been completed.
It would be interesting to know if this does fix things for you, because
it is another data point in chasing this bug. Unfortuantely, the bug is
very dependent on the Python version, architecture and OS that it is
installed on, so just because it fails for you on one particular setup,
doesn't mean it will fail for you in another case (or for anybody else
with a similar setup). So realise that I cannot tell you for certain
that this fix will do anything at all -- but it looks similar to some
other reports.
Regards,
Malcolm
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