#29810: Left outer join using FilteredRelation failed on empty result
-------------------------------------+-------------------------------------
Reporter: dvazar | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 2.0
layer (models, ORM) | Keywords: ORM
Severity: Normal | FilteredRelation
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
When I try to join table with using `FilteredRelation` clause it failed if
the result of a joined table is null.
This error can be reproduce by adding the following test case to the
corresponding
[https://github.com/django/django/blob/2.0/tests/filtered_relation/tests.py#L9
test module]:
{{{#!div style="font-size: 80%"
tests.filtered_relation.tests.FilteredRelationTests:
{{{#!python
def test_select_related_empty_join(self):
self.assertFalse(
Author.objects.annotate(
empty_join=FilteredRelation('book', condition=Q(
book__title='not existing book')),
).select_related('empty_join')
)
}}}
}}}
This bug is typical since version 2.0 and exists until now.
--
Ticket URL: <https://code.djangoproject.com/ticket/29810>
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