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
Aug 27, 2024Technology
An Effective Preparation Algorithm for ISTQB Certification

This article offers key insights into the ISTQB certification and shares a proven preparation strategy to help candidates succeed.

May 9, 2018Technology
How to Generate PDF Files in Python with Xhtml2pdf, WeasyPrint or Unoconv

Programmatic generation of PDF files is a frequent task when developing applications that can export reports, bills, or questionnaires. In this article, we will consider three common tools for creating PDFs, including their installation and converting principles.

May 22, 2017Technology
Web Application Security: 10 Best Practices

Protection of WEB App is of paramount importance and it should be afforded the same level of security as the intellectual rights or private property. I'm going to cover how to protect your web app.

Jan 22, 2017Technology
Django vs Rails Performance

This article is aimed for beginners, who are trying to choose between Ruby on Rails and Django. Let’s see which is fastest and why.

Aug 8, 2016TechnologyBusiness
How To Add HTML5 Geolocation To Your Web App?

In this article I will describe how to integrate geolocation HTML5 function to a web app so you can then easily implement it in your apps or websites. As an example we are going to create small web app which will be able to calculate the shortest route between detected user’s location and predefined destination using Google Maps API.

Apr 3, 2011Technology
Sprite cache invalidation

When we use css-sprites it's important to make browser cache them for longest period possible. On other hand, we need to refresh them when they are updated. This is especially visible when all icons are stored in single sprite. When it's outdated - entire site becomes ugly.