#31714: ResolvedOuterRef object has no get_lookup
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Reporter: BorisZZZ | Owner: (none)
Type: | Status: new
Cleanup/optimization |
Component: Database layer | Version: 3.0
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
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 Simon Charette):
FWIW I [https://forum.djangoproject.com/t/error-when-annotating-distance-
between-2-points-inside-a-subquery-geodjango/30879 stumbled upon another
user running into the same problem] but for `_output_field_or_none`.
I think that an appropriate solution here could be to
1. Allow an `output_field` to be specified to `OuterRef` and percolate to
`ResolvedOuterRef`. It's a common pattern for `Expression`-like to accept
this kind of parameter.
2. At the time `ResolvedOuterRef` performs its final resolution in the
outer query error out if there is a mismatch of `output_field` (type only
should be enough) between what was explicitly specified and the resolved
expression one.
While the `ExpressionWrapper` solution works I think
[https://forum.djangoproject.com/t/error-when-annotating-distance-
between-2-points-inside-a-subquery-geodjango/30879/4 it's a big leap] for
users to figure out they should be using it when they encounter a
seemingly random `AttributeError`.
--
Ticket URL: <https://code.djangoproject.com/ticket/31714#comment:7>
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