Django - rahulmishra.tech

Fixing N+1 query problem in Django

N+1 is a very common data-access pattern problem where a query is executed for every result of a previous query. If the definition looks cryptic, let's understand this problem with an example. We have created Country, Musician and Album tables with 20 rows in Album, 10 rows in Musician,

Django

Django Custom Middleware

Django middleware is a way to globally alter requests and responses ie. middlewares are layers of business logic that will be applied to all requests and responses. Consider an example to add logging for all requests, then the ideal way would be to add a middleware layer for the same,

Django

What Is Django Model Manager?

Django Model Manager is the interface through which database query operations are provided to Django models. objects is the default model manager and each model needs to have at least one model manager. Let's see a few use-cases when we can use model managers and when to use custom model

Celery

What Is Django-Celery?

In this article, we will understand what asynchronous processing is, how to set up asynchronous processing for a Django project and what are the use-cases. Let's start with the problem statement, lets say you have a website and on signup, you want to send an email to the new customer,

ContentType

How To Use GenericForeignKeys In Django

In the first part of the article, we learned about the contenttypes framework and the ContentType model. In this article, we will see how that is being used in the implementation of Generic Foreign Keys. Let's first understand when we can need a generic foreign key, consider a case, where

ContentType

Understanding Django ContentType

In this series, we will understand Django's ContentType and what is GenericForeignKey with examples. contenttypes is a Django app that can track all of the models installed in our Django-powered project, providing a high-level, generic interface for working with our models. If we check in settings INSTALLED_APPS we can

Django

Select Related Vs Prefetch Related In Django

select_related and prefetch_related are ways to optimize database querying patterns when accessing related items. Both works on the same principle of prefetching data from the database, however, they take different approaches to do so. We will be using a decorator to print all the stats for the query.

Django