#30188: Aggregate annotation, Case() - When(): AssertionError No exception
message
supplied
-------------------------------------+-------------------------------------
Reporter: Lukas Klement | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 2.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: query, aggregate, | Triage Stage: Accepted
case/when |
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Simon Charette):
I agree with Lukas that we should investigate why the ORM crashes here as
it's a completely valid query from my perspective.
The fundamental issue here is that `Subquery` breaks the `Expression` API
by having a `get_source_expressions` method that returns `N > 0`
expressions while having a `set_source_expressions` that accepts none.
I happen to have a local branch I've been playing with locally to make
`Subquery` more a of dumb wrapper around `sql.Query` that happens to
restore this contract. I haven't tried it out against this exact set of
models but the fact the caller
[https://github.com/django/django/blob/b435f82939edf70674856e0e1cd63973c2e0a1d1/django/db/models/sql/query.py#L362-L389
hosts a FIXME] makes me feel like there might be something else going on.
--
Ticket URL: <https://code.djangoproject.com/ticket/30188#comment:14>
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