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django annotate

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Abhay Raghuvanshi answered on September 24, 2022 Popularity 10/10 Helpfulness 2/10

answer django annotate

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django annotate

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Django annotate allows us to add a pseudo field to our queryset.

read this blog: https://medium.com/@singhgautam7/django-annotations-steroids-to-your-querysets-766231f0823a

Model.objects.annotate(<field_name>=<value>)

field_name: can be anything that you want.

value: whatever the value is.

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Contributed on Jan 30 2023

Abhay Raghuvanshi

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from datetime import timedelta
from django.utils import timezone
from django.db.models import Count, Q # need import

Article.objects.annotate(
    numviews=Count(
        'readership__reader__id', 
        filter=Q(readership__what_time__gt=timezone.now() - timedelta(minutes=30)), 
        distinct=True
    )
)


from django.db.models import Count, Case, When, IntegerField
Article.objects.annotate(
    numviews=Count(Case(
        When(readership__what_time__lt=treshold, then=1),
        output_field=IntegerField(),
    ))
)

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Contributed on Sep 24 2022

Andrew Charles Powell

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