#27241: Annotate doesn't work with PostgreSQL views anymore
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Reporter: jaap3 | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: postgresql view | Triage Stage: Accepted
aggregate annotate |
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by jaap3):
I don't known if disabling the optimisation for all unmanaged models is
the right choice. It seems that this is a fairly esoteric edge case. The
fact that this behaviour was changed in 1.9 and almost nobody has noticed
until now speaks for itself (I can only find one other issue that looks
similar: #26758).
I'm sure that most unmanaged models are normal database tables with a
primary key constraint. It would be a shame to have to disable something
that works fine for the vast majority of use cases just because of this
one edge case.
Instead, would it be feasible to be able to opt-out of the optimisation by
setting a flag on the model's Meta class? So instead of checking if
`managed` is `False`, Django could check if `allows_group_by_selected_pks`
is set to `False` for the model and then choose not to perform the related
optimisation.
I am actively maintaining this application and would have no qualms about
adding a flag to the few models affected by this issue. If anyone else
runs into this the must also be actively maintaining theirs so they can do
the same thing.
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Ticket URL: <https://code.djangoproject.com/ticket/27241#comment:7>
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