Hi everyone.
I've been using django for almost a year now, but it's my first time
posting here.
Anyway, I'm encountering an error which I think might be a bug. I've yet to
try and replicate it as I thought posting here would be the better first
step, as I might just be doing something incorrectly.
When I try a query with .exclude() on a table with a GenericForeignKey and
a reverse Generic Relation on a different table, I get this:
AttributeError at /list
'GenericRelation' object has no attribute 'field'
Here is a mock up of my database structure:
class InternalOffer(models.Model):
user = models.ForeignKey('User')
status = models.CharField(max_length=64)
(more offer data...)
relation = GenericRelation(OfferJoin, related_query_name='offerquery')
class ExternalOffer(models.Model):
user = models.ForeignKey('User')
status = models.CharField(max_length=64)
(more offer data...)
relation = GenericRelation(OfferJoin, related_query_name='offerquery')
class OfferJoin(models.Model):
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
offer = GenericForeignKey('content_type', 'object_id')
I can filter fine, it's only the exclude that causes errors. Here is the
code that causes the error:
offers = OfferCover.objects.filter(offerquery__user__id=request.user.id)
offers = offers.exclude(offerquery__status="Completed")
Here's the full callback:
Django Version: 1.8.2
Python Version: 2.7.6
Traceback:
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py" in
get_response
132. response = wrapped_callback(request,
*callback_args, **callback_kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/auth/decorators.py"
in _wrapped_view
22. return view_func(request, *args, **kwargs)
File "/Users/path-to-project/project/views.py" in list
136. offers = offers.exclude(o__status="Completed")
File "/Library/Python/2.7/site-packages/django/db/models/query.py" in
exclude
686. return self._filter_or_exclude(True, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/db/models/query.py" in
_filter_or_exclude
695. clone.query.add_q(~Q(*args, **kwargs))
File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py" in
add_q
1304. clause, require_inner = self._add_q(where_part,
self.used_aliases)
File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py" in
_add_q
1332. allow_joins=allow_joins, split_subq=split_subq,
File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py" in
build_filter
1180. can_reuse, e.names_with_path)
File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py" in
split_exclude
1562. trimmed_prefix, contains_louter =
query.trim_start(names_with_path)
File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py" in
trim_start
1989. join_field = path.join_field.field
Exception Type: AttributeError at /list
Exception Value: 'GenericRelation' object has no attribute 'field'
I've read the documentation multiple times and haven't come across anything
usefull. I know that filtering GFKs alone won't work, but both filtering
and excluding should work with the reverse Generic Relation.
Thanks!
- Daniel Harris
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