Back
Sep 23, 2010

OR and AND without django.db.models.Q

I just found out that orand andare defined for QuerySet. This means that to do queries union or intersection, you can do:

User.objects.filter(...) | User.objects.filter(...)
User.objects.filter(...) & User.objects.filter(...)

Subscribe for the news and updates

More thoughts
Dec 22, 2024Technology
Python and the Point Rush in DeFi

This article demonstrates how to use Python to automate yield calculations in decentralized finance (DeFi), focusing on the Renzo and Pendle platforms. It guides readers through estimating potential rewards based on factors like token prices, liquidity, and reward distribution rules, emphasizing the importance of regular data updates and informed decision-making in DeFi investments.

May 12, 2022Technology
Increasing performance by using proper query structure

Earlier in our previous article "Improve efficiency of your SELECT queries" we discussed ways to profile and optimize the performance of SELECT queries. However, to write complex yet efficient SQL queries, there is a thing to remember about.

Sep 21, 2020Technology
How to Optimize Django ORM Queries

Django ORM is a very abstract and flexible API. But if you do not know exactly how it works, you will likely end up with slow and heavy views, if you have not already. So, this article provides practical solutions to N+1 and high loading time issues. For clarity, I will create a simple view that demonstrates common ORM query problems and shows frequently used practices.

Jul 27, 2017Technology
How to Deploy Django app with AWS Elastic Beanstalk?

In this article I'll show you how to deploy Django application to AWS Beanstalk.

May 26, 2017Technology
Tutorial: Django User Registration and Authentication

In this beginners friends article I'll explain how to make authentication with Google account on your Django site and how to make authentication for you REST API.

Jun 25, 2011Technology
Ajax blocks in Django

Quite often we have to write paginated or filtered blocks of information on page. I created a decorator that would automate this process.