#25319: QuerySet not working with Union + Exclude
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Reporter: nanchenchen | 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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I created a few QuerySets and tried to union them.
However, as long as my querysets contain exclude (i.e., I called
queryset.exclude to get the new one), the union operation will be fail.
The error message is "No exception message supplied"
I tracked it and found it failed over here:
{{{
/home/vagrant/.virtualenvs/textvisdrg/local/lib/python2.7/site-
packages/django/db/models/sql/query.py in change_aliases
def change_aliases(self, change_map):
"""
Changes the aliases in change_map (which maps old-alias -> new-
alias),
relabelling any references to them in select columns and the where
clause.
"""
assert
set(change_map.keys()).intersection(set(change_map.values())) == set() ...
def relabel_column(col):
if isinstance(col, (list, tuple)):
old_alias = col[0]
return (change_map.get(old_alias, old_alias), col[1])
else:
}}}
It's Line 776.
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Ticket URL: <https://code.djangoproject.com/ticket/25319>
Django <https://code.djangoproject.com/>
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