Fwd: Django 1.7 polymorphism error

[Thiago Avelino]

Hi guys!

I think I found a error polymorphism in django 1.7, field slug exist in _meta.fields and run filter return error "FieldError: Cannot resolve keyword 'slug' into field. Choices".

Example: https://gist.github.com/avelino/793bdaf9f9732314912a

Slugged (abstract): https://github.com/opps/opps/blob/8e58a60c3cfea75b5cc4455d247a75b26f995b58/opps/core/models/core.py#L80

Article (abstract): https://github.com/opps/opps/blob/8e58a60c3cfea75b5cc4455d247a75b26f995b58/opps/containers/abstracts/articles.py#L12

Post: https://github.com/opps/opps/blob/8e58a60c3cfea75b5cc4455d247a75b26f995b58/opps/containers/types/posts.py#L8

Container: https://github.com/opps/opps/blob/8e58a60c3cfea75b5cc4455d247a75b26f995b58/opps/containers/models/core.py#L29


class Container(Publishable, Channeling):
class Article(Container, Slugged, Tagged):
class Post(Article):

In Post not exist slug (on filtrer) and _meta.fields exist!

Cheers,

Thiago Avelino

@avelino0 - avelino.xxx

[Carl Meyer]

Hi Thiago,

It certainly looks like there's a bug there somewhere, but there's so
much going on in your code (including inheriting from PolymorphicModel,
a third-party base class) that it's hard to say where the bug might be
(and whether it's even a bug in Django at all) without doing some direct
exploration (i.e. using pdb to trace into the filter call and figure out
exactly why a FieldError is being raised for 'slug' when a field of that
name appears to exist). I think if you want a resolution here, you'll
likely need to do that exploration yourself and try to narrow down the
source of the bug so that you can reproduce it with a simplest-case example.

Carl

[Thiago Avelino]

Without PolymorphicModel he's the same error!

I'll write an example...

Cheers,

Thiago Avelino

@avelino0 - avelino.xxx

Carl

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