#35491: QuerySet.extra use case. Unnest array and make it lower. and make it an
array again.
-------------------------------------+-------------------------------------
Reporter: june | Owner: nobody
Type: New | Status: new
feature |
Component: Database | Version: 4.2
layer (models, ORM) |
Severity: Normal | Keywords: QuerySet.extra
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
I had used extra() for annotating Arrayfield with lower cases and filter
out with another array intersection.
Below is what I used for
```
lower_value = [v.lower() for v in value]
numbers = Numeric.objects.extra(
where=[f"ARRAY(SELECT lower(unnest({array_field}))) &&
%s::text[]"],
params=[lower_value],
)
```
I need to unnest arrayfield first and make each elements lowercase, and
make it an Array again.
and then need to check overlay with another array.
--
Ticket URL: <https://code.djangoproject.com/ticket/35491>
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