15 lines
741 B
Diff
15 lines
741 B
Diff
Let me provide the patch based on my knowledge of Django's codebase structure. The issue is that `distinct()` on union querysets should raise an error like other unsupported operations.
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--- a/django/db/models/query.py
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+++ b/django/db/models/query.py
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@@ -1000,6 +1000,10 @@ class QuerySet:
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def distinct(self, *field_names):
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"""Return a new QuerySet instance that will select only distinct results."""
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+ if self.query.combinator:
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+ raise NotSupportedError(
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+ 'Calling distinct() after %s() is not supported.' % self.query.combinator
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+ )
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assert self.query.can_filter(), \
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"Cannot create distinct fields once a slice has been taken."
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obj = self._chain()
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