Re: Pickling of dinamically created models.Model subclasses: "attribute lookup failed", django 1.5

On 18 huhti, 22:07, Greg H <ghi...@gmail.com> wrote:
> Running into a similar issue on my own project, seems to be when you try an
> cache a model which has a related model which in turn has a many to many
> field. So for example, I have an instance of a Student, which has a
> ForeignKey to Book, which in turn has a ManyToMany to Author. If I try and
> cache my Student instance, I get that pickling error. In Django 1.4 it
> worked fine, but not in 1.5.
>
> Figure out a resolution to this?

The problem is that for an instance of a class to be picklable the
class must be available as a module level attribute somewhere. For
dynamically created classes this is usually not true - they aren't
available at module level. One set of such classes is automatically
created through models for m2m fields. The automatic through classes
could explain the ManyToMany problem.

All in all this looks like a regression that should be fixed in 1.5. I
created a ticket for this, see: https://code.djangoproject.com/ticket/20289

- Anssi

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