Is it possible for Django to sum lengths of a non-numeric field?
Question:
I have learned we can sum all(or filtered) columns like price from this question.
ItemPrice.objects.aggregate(Sum('price'))
But is it possible for Django to sum non-numeric field’s length, such as CharField or JSONField? A pseudocode is like following.
User.objects.aggregate(Sum(len('username')))
Answers:
from django.db.models.functions import Length
from django.db.models import Sum
User.objects.annotate(l=Length("username")).aggregate(Sum("l"))
you can try use
from django.db.models.functions import Length User.objects.aggregate(Sum(Length('username')))
For a JSONFied, we can use Count to sum all the items.
from django.db.models import Sum, Count
User.objects.annotate(l=Count("json_filed")).aggregate(Sum("l"))
I have learned we can sum all(or filtered) columns like price from this question.
ItemPrice.objects.aggregate(Sum('price'))
But is it possible for Django to sum non-numeric field’s length, such as CharField or JSONField? A pseudocode is like following.
User.objects.aggregate(Sum(len('username')))
from django.db.models.functions import Length
from django.db.models import Sum
User.objects.annotate(l=Length("username")).aggregate(Sum("l"))
you can try use
from django.db.models.functions import Length User.objects.aggregate(Sum(Length('username')))
For a JSONFied, we can use Count to sum all the items.
from django.db.models import Sum, Count
User.objects.annotate(l=Count("json_filed")).aggregate(Sum("l"))