#36388: QuerySet.union no longer supports empty args
--------------------------------+-----------------------------------------
Reporter: Antoine Humeau | Type: Bug
Status: new | Component: Uncategorized
Version: 5.2 | Severity: Normal
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Hello there,
Up until Django 5.1 (included), it was possible to use the union queryset
method with an empty arg list, example:
{{{
User.objects.union()
}}}
This example is obviously useless but the following pattern would be
equivalent and would be more reallistic:
{{{
def unite_querysets(querysets):
queryset, *other_querysets = querysets
queryset = queryset.union(*other_querysets)
}}}
Since Django 5.2, that triggers the following exception:
{{{
AttributeError: 'NoneType' object has no attribute 'elide_empty'
}}}
The line that triggers the exception is the following:
https://github.com/django/django/blob/5.2.1/django/db/models/sql/compiler.py#L616
empty_compiler is never initialized.
I am not sure this really qualifies as a bug, it might be a unsupported
usage, still it is a regression.
--
Ticket URL: <https://code.djangoproject.com/ticket/36388>
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