#28731: Passing an empty Q() to a When inside a Case causes an OperationError
-------------------------------------+-------------------------------------
Reporter: Tom van Bussel | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.11
(models, ORM) |
Severity: Normal | Resolution:
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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Description changed by Tom van Bussel:
Old description:
> The following code causes an OperationError:
> {{{
> q = Q() # Dynamically constructed, possibly empty
> x = TestModel.objects.annotate(test_name=When(q, then=Value(True)),
> default=Value(False), output_field=BooleanField())).all()
> print(x)
> }}}
> The code above results in a SQL query which contains {{{CASE WHEN
> THEN}}}, with nothing between the WHEN and THEN.
New description:
The following code causes an OperationError:
{{{
q = Q() # Dynamically constructed, possibly empty
x = TestModel.objects.annotate(test_name=Case(When(q, then=Value(True)),
default=Value(False), output_field=BooleanField())).all()
print(x)
}}}
The code above results in a SQL query which contains {{{CASE WHEN
THEN}}}, with nothing between the WHEN and THEN.
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Ticket URL: <https://code.djangoproject.com/ticket/28731#comment:1>
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