#29429: Make len lookup for ArrayField use the array_length function
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Reporter: creative3000 | Owner: (none)
Type: Bug | Status: closed
Component: contrib.postgres | Version: 2.0
Severity: Normal | Resolution: needsinfo
Keywords: db orm ArrayField | Triage Stage: Accepted
postgres |
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by Claude Paroz):
* status: new => closed
* resolution: => needsinfo
Comment:
Are you sure the line
`Post.objects.all().annotate(tag_len=F('tags__len'))` is valid?
Where did you read in the documentation a similar construct with a
Transform inside a `F()` expression?
In my opinion, you should have written:
{{{
from django.contrib.postgres.fields.array import ArrayLenTransform
Post.objects.all().annotate(tag_len=ArrayLenTransform('tags'))
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/29429#comment:5>
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