Opened 4 years ago

Last modified 4 years ago

#31691 closed New feature

django.contrib.postgres.aggregates.JSONBAgg does not support ordering — at Version 3

Reported by: john-parton Owned by: nobody
Component: contrib.postgres Version: dev
Severity: Normal Keywords:
Cc: Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by john-parton)

Here's a contrived example:

class Author(models.Model):
    name = models.CharField(max_length=50)
    alias = models.CharField(max_length=50, null=True, blank=True)
    age = models.PositiveSmallIntegerField(default=30)


class Article(models.Model):
    authors = models.ManyToManyField(Author, related_name='articles')
    title = models.CharField(max_length=50)
    
    
Article.objects.annotate(
    authors_json=JSONBAgg(
        Func(
            Value('name'), 'name',
            Value('alias'), 'alias',
            function='jsonb_build_object'
        ),
        ordering='age'
    )
)

The ordering kwarg is ignored, but Postgres would have no problem understanding the aggregate with an ORDER BY clause

In my code I did the following

class OrderableJSONBAgg(OrderableAggMixin, Aggregate):
    function = 'JSONB_AGG'
    template = '%(function)s(%(expressions)s %(ordering)s)'
    output_field = JSONField()

    def convert_value(self, value, expression, connection):
        if not value:
            return []
        return value
    
    
from myapp.aggregates import OrderableJSONBAgg as JSONBAgg

I believe replacing the existing JSONBAgg with this implementation would add the feature, with no backwards compat issues.

Change History (3)

comment:1 by john-parton, 4 years ago

Description: modified (diff)

comment:2 by john-parton, 4 years ago

Description: modified (diff)

comment:3 by john-parton, 4 years ago

Description: modified (diff)
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