It may be https://code.djangoproject.com/ticket/21410? If so, that'll be fixed in 1.6.1.
On Thursday, November 21, 2013 7:52:29 PM UTC-5, Rhett G. wrote: > > Trying to migrate our Django 1.5 application to 1.6. I hit what I think is > a bug, or at the very least very confusing behavior. > Imagine some models like the following: > > class Img(Model): > uuid = CharField() > > > class ImgResolutions(Model): > img = ForeignKey(Img, related_name='resolutions') > url = CharField() > > > # Lots of things have images, this is just one, so I want to leave off > the related name, just as is documented in > # > https://docs.djangoproject.com/en/1.6/ref/models/fields/#django.db.models.ForeignKey.related_name<https://www.google.com/url?q=https%3A%2F%2Fdocs.djangoproject.com%2Fen%2F1.6%2Fref%2Fmodels%2Ffields%2F%23django.db.models.ForeignKey.related_name&sa=D&sntz=1&usg=AFQjCNHzaxgcSR3ToBkDCE-mo_EBOy5W7g> > class Place(Model): > detail_img = ForeignKey(Img, related_name='+') > icon_img = ForeignKey(Img, related_name='+') > > > Now, when I do a query like this: > > places = Place.objects.filter(.. whatever > ..).prefetch_related('detail_img__resolutions') > > I get something like: > > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/query.py", > > line 96, in __iter__ > self._fetch_all() > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/query.py", > > line 856, in _fetch_all > self._prefetch_related_objects() > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/query.py", > > line 517, in _prefetch_related_objects > prefetch_related_objects(self._result_cache, > self._prefetch_related_lookups) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/query.py", > > line 1598, in prefetch_related_objects > obj_list, additional_prl = prefetch_one_level(obj_list, prefetcher, > attr) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/query.py", > > line 1697, in prefetch_one_level > prefetcher.get_prefetch_queryset(instances) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/fields/related.py", > > line 277, in get_prefetch_queryset > qs = self.get_queryset(instance=instances[0]).filter(**query) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/query.py", > > line 590, in filter > return self._filter_or_exclude(False, *args, **kwargs) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/query.py", > > line 608, in _filter_or_exclude > clone.query.add_q(Q(*args, **kwargs)) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/sql/query.py", > > line 1202, in add_q > clause = self._add_q(where_part, used_aliases) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/sql/query.py", > > line 1236, in _add_q > current_negated=current_negated) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/sql/query.py", > > line 1101, in build_filter > allow_explicit_fk=True) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/sql/query.py", > > line 1356, in setup_joins > names, opts, allow_many, allow_explicit_fk) > File > "/postmates/virtualenv.d/postal-main/env/local/lib/python2.7/site-packages/django/db/models/sql/query.py", > > line 1279, in names_to_path > "Choices are: %s" % (name, ", ".join(available))) > FieldError: Cannot resolve keyword '+' into field. Choices are: > date_created, date_updated, deleted, id, resolutions, uuid > > From what I can tell, this has something to do with the addition of > related_query_name. > For some reason, it's trying to build a filter that looks like '+_in', > because of L276 in django/db/models/fields/related.py : > > query = {'%s__in' % self.field.related_query_name(): instances} > > I think it's trying to build a query like "Img.place in [place list]" > > Am I doing something wrong or is this a bug? > > Thanks, > > Rhett > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/df539eed-742f-46b2-bfba-9427c597d712%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
