Hi:
I have two models, publishing and entry, whose relationship is one to
many (one entry can have many publishings). In the admin interface I
have a ModelAdmin class (for Publishing) in which I specify the
following:
search_fields = ('entry__title',)
I should now be able to view a list of publishings that is filtered
based its entry's title. Well, I get the following error:
Exception Type: AssertionError at /admin/coltrane/publishing/
Exception Value: Cannot combine a unique query with a non-unique
query.
I understand what the exception means but I'm not sure why there is a
combination of unique and non-unique queries or how to go about fixing
this error. I searched the web and this list, but no luck. Any ideas?
Full traceback below.
Cheers,
A.
Traceback:
File "/Library/Python/2.5/site-packages/django/core/handlers/base.py"
in get_response
86. response = callback(request, *callback_args,
**callback_kwargs)
File "/Library/Python/2.5/site-packages/django/contrib/admin/sites.py"
in root
158. return self.model_page(request, *url.split('/',
2))
File "/Library/Python/2.5/site-packages/django/views/decorators/
cache.py" in _wrapped_view_func
44. response = view_func(request, *args, **kwargs)
File "/Library/Python/2.5/site-packages/django/contrib/admin/sites.py"
in model_page
177. return admin_obj(request, rest_of_url)
File "/Library/Python/2.5/site-packages/django/contrib/admin/
options.py" in __call__
189. return self.changelist_view(request)
File "/Library/Python/2.5/site-packages/django/contrib/admin/
options.py" in changelist_view
638. self.date_hierarchy, self.search_fields,
self.list_select_related, self.list_per_page, self)
File "/Library/Python/2.5/site-packages/django/contrib/admin/views/
main.py" in __init__
67. self.query_set = self.get_query_set()
File "/Library/Python/2.5/site-packages/django/contrib/admin/views/
main.py" in get_query_set
229. qs = qs & other_qs
File "/Library/Python/2.5/site-packages/django/db/models/query.py" in
__and__
241. combined.query.combine(other.query, sql.AND)
File "/Library/Python/2.5/site-packages/django/db/models/sql/query.py"
in combine
325. "Cannot combine a unique query with a non-unique
query."
Exception Type: AssertionError at /admin/coltrane/publishing/
Exception Value: Cannot combine a unique query with a non-unique
query.
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