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This frustrating error blocks you from executing schema changes on a table that has triggers enabled. In this post, we’ll explore why this error occurs and how to resolve it. When running migrations in Django, you may encounter an error like: Understanding Django Migration Errors First, let’s review what’s happening when you get this error. … Read more
Django makes it easy to dynamically display the current year in your templates. This can be useful for copyright notices, showing the release year of your product, or other situations where you want to automatically update the year displayed on your site. In this post, we’ll cover a simple way to show the current year … Read more
When developing Django applications using Docker Compose for the local environment, managing database changes can require some special handling. In particular, applying Django migrations within the Docker-Composed environment requires coordination between the app container and the database container. Here is an overview of why this extra coordination is needed and some best practices for streamlining … Read more
When building a Django application, you may need to reference configuration variables from settings.py in other parts of your code. One common place is in models.py, where you define your database models. Accessing settings allows you to parameterize aspects of your models. For example, you can define the default database or control auto-created fields like … Read more
As we know, Django provides robust user authentication and authorization tools out of the box. One useful feature is user groups – they allow you to categorize users and control permissions based on those groups. But how do you check if a specific user is in a certain group? There are a couple approaches we … Read more
As Django developers, we work mostly with the object-oriented Django ORM interface when querying data from our databases. However, under the hood, the Django ORM constructs SQL queries to interact with the database. It can be useful to view the raw SQL for debugging performance issues or gaining a deeper understanding of how the ORM … Read more
The Django admin interface provides a convenient way to manage database content by automatically generating interfaces to create, view, edit, and delete records. By default, the admin allows all database operations on all models. However, in some cases, you may want to restrict the ability to add new records for certain models. Why Restrict Add … Read more
Django is a powerful web framework for Python that makes it easy to build complex database-backed web applications. One common task is needing to store a list or array of data in a model. There are a few different ways to approach this, each with their own pros and cons. In this post, we will … Read more
When building a Django application, one of the most important considerations is how to securely store sensitive data like passwords, API keys, and other credentials. A common question that arises is whether it is safe to store these secrets as environment variables rather than hardcoding them in config files. In this post, we’ll explore the … Read more
Django South is a useful database migration tool for Django projects. It allows you to make changes to your models and automatically generate migrations to update your database schema. However, you may encounter frustrating “table already exists” errors when running these migrations. In this post, we’ll explore some common causes and solutions for these errors. … Read more
Django‘s reverse() function is incredibly useful for programmatically generating URLs in your views and templates. However, you may sometimes run into the frustrating error “Reverse with arguments ‘()’ and keyword arguments ‘{}’ not found”. In this blog post, I’ll explain what’s causing this error and show you exactly how to fix it. Understanding Django’s Reverse … Read more
As your Python projects grow in complexity, you may find yourself needing to manage multiple versions of packages and Python itself. Virtualenvs allow you to create isolated Python environments to keep dependencies separate. However, replicating an environment manually is tedious. Luckily, there are simpler methods to duplicate your virtualenv. Getting Started First, a quick overview … Read more
Django provides a very convenient way to delete all rows from a database table that is tied to a Django model. While dropping the table and recreating it is an option, Django allows you to truncate the table instead which is faster, especially for large tables. The Django Model and Database Table Relationship First, it’s … Read more
Django provides a way to ensure uniqueness for model fields through the unique=True parameter. However, by default, Django’s unique constraint does not allow multiple NULL-values. So if you want to allow one or more NULL values in a unique field, you need to put in some extra work. In this post, we’ll explore the options … Read more
Django templates provide several useful filters and tags for looping through and accessing data in dictionaries and lists. However, iterating through nested data structures like a dictionary inside a dictionary can be tricky. In this post, I’ll explain different methods for looping through and accessing nested dictionary’s data in Django templates. Using Dot Notation in … Read more
Django’s template system provides a powerful {% url %} tag that allows you to refer to URLs by their name instead of hardcoding the URLs. However, sometimes you need to add additional parameters to these URLs dynamically within the template. Fortunately, the url template tag supports adding parameters in a clean way. The Basics of … Read more
The Django web framework provides great security features out of the box, including protection against cross-site request forgery (CSRF) attacks. However, you may need to disable CSRF protection for API endpoints built with Django Rest Framework. In this post, we’ll examine when and why you might want to remove this protection What is CSRF and … Read more
When you create a model in Django and don’t explicitly define a primary key, Django will automatically add an id field to serve as the primary key. This auto-created id field can generate warnings that many developers find confusing at first. In this blog post, we’ll take a deeper look at these warnings and what … Read more
Django REST Framework makes it easy to quickly build REST APIs for Django models. The ModelSerializer class provides a convenient way to serialize Django models to and from JSON. Often, you may need to add extra fields to the serialized representation that are not part of the model itself. In this post, we’ll explore a … Read more
Getting started with Django web development typically involves running the development server on localhost to preview your site. However, there may be times when you need to access your local development site from another device on the same network. Fortunately, with a few configuration tweaks, you can externally access your Django site hosted locally. Enabling … Read more
