[Django] #23779: Can't use unique_together if one of the fields is in a mixin

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Nov 7, 2014, 10:27:33 AM11/7/14

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#23779: Can't use unique_together if one of the fields is in a mixin
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Reporter: knyghty | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.7
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Slightly related to https://code.djangoproject.com/ticket/16732

I have a mixin:

{{{
class PublishableMixin(object):
publish_date = models.DateTimeField()
}}}

and a model I wish to use it in:

{{{
class Article(PublishableMixin, models.Model):
slug = models.SlugField()

class Meta:
unique_together = ('publish_date', 'slug')
}}}

This fails at the system check level:

news.Article: (models.E012) 'unique_together' refers to the non-existent
field 'publish_date'.

--
Ticket URL: <https://code.djangoproject.com/ticket/23779>
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Nov 7, 2014, 10:33:44 AM11/7/14

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#23779: Can't use unique_together if one of the fields is in a mixin

Easy pickings: 0 | UI/UX: 0

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Changes (by timgraham):

* status: new => closed
* needs_docs: => 0
* resolution: => invalid
* needs_tests: => 0
* needs_better_patch: => 0

Comment:

You need to use abstract models as described
[https://docs.djangoproject.com/en/dev/topics/db/models/#model-inheritance
in the documentation] (not inherit from `object`). If something isn't
clear there about that, could you open a documentation ticket? Thanks!