Skip to main content

Utils for maintaining denormalized aggregates for Django models

Project description

django-denormalized

Utils for maintaining denormalized aggregates for Django models.

Build Status codecov

Example

from django.db import models
from denormalized import DenormalizedTracker, DenormalizedForeignKey


class Group(models.Model):
    members_count = models.PositiveIntegerField(default=0)
    points_sum = models.PositiveIntegerField(default=0)


class Member(models.Model):
    group = DenormalizedForeignKey(
        Group, models.CASCADE,
        trackers=[
            DenormalizedTracker(
                # name of field to store denormalized count of active members
                "members_count",                    
                # callback to determine whether object should be counted or not
                callback=lambda obj: obj.active,
                # QuerySet filter to count only suitable objects
                query=models.Q(active=True)),
            DenormalizedTracker(
                # multiple denormalized fields tracked for single foreign key
                "points_sum",
                # Sum is also supported
                aggregate=models.Sum("points"))
        ])
    active = models.BooleanField(default=True)
    points = models.IntegerField(default=0)

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

django_denormalized-0.5.0.tar.gz (3.3 kB view hashes)

Uploaded Source

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page