Django Components

Complete reference for all 33 Django components -- patterns, APIs, configuration, and best practices for Python 3.10+ and Django 6.0.

Component Index

Models & Database

• Models -- Model definition, field types, Meta options, inheritance, managers -> reference

• QuerySets -- QuerySet API, field lookups, Q objects, F expressions, aggregation -> reference

• Migrations -- Migration workflow, operations, data migrations, squashing -> reference

• Database Functions -- Database functions, conditional expressions, full-text search -> reference

Views & HTTP

• Views -- Function-based views, shortcuts (render, redirect, get_object_or_404) -> reference

• Class-Based Views -- ListView, DetailView, CreateView, UpdateView, DeleteView, mixins -> reference

• URL Routing -- URL configuration, path(), re_path(), namespaces, reverse() -> reference

• Middleware -- Middleware architecture, built-in middleware, custom middleware -> reference

• Request & Response -- HttpRequest, HttpResponse, JsonResponse, StreamingHttpResponse -> reference

Templates

• Templates -- Template language, tags, filters, inheritance, custom template tags -> reference

Forms

• Forms -- Form class, fields, widgets, ModelForm, formsets, validation -> reference

Admin

• Admin -- ModelAdmin, list_display, fieldsets, inlines, actions, customization -> reference

Authentication & Security

• Authentication -- User model, login/logout, permissions, groups, custom user models -> reference

• Security -- CSRF, XSS, clickjacking, SSL, CSP, cryptographic signing -> reference

• Sessions -- Session framework, backends, configuration -> reference

Caching

• Cache -- Cache backends (Redis, Memcached, DB, filesystem), per-view/template caching -> reference

Signals

• Signals -- Signal dispatcher, built-in signals (pre_save, post_save, etc.) -> reference

Communication

• Email -- send_mail, EmailMessage, HTML emails, backends -> reference

• Messages -- Messages framework, levels, storage backends -> reference

Testing

• Testing -- TestCase, Client, assertions, RequestFactory, fixtures -> reference

Files & Static Assets

• Files -- File objects, storage API, file uploads, custom storage -> reference

• Static Files -- Static file configuration, collectstatic, ManifestStaticFilesStorage -> reference

Internationalization

• I18n -- Translation, localization, timezones, message files -> reference

Serialization & Data

• Serialization -- Serializers, JSON/XML formats, natural keys, fixtures -> reference

• Content Types -- ContentType model, generic relations -> reference

• Validators -- Built-in validators, custom validators -> reference

• Pagination -- Paginator, Page objects, template integration -> reference

Async & Tasks

• Async -- Async views, async ORM, sync_to_async, ASGI -> reference

• Tasks -- Tasks framework, task backends, scheduling -> reference

Configuration & CLI

• Settings -- Settings reference by category, splitting settings -> reference

• Management Commands -- Built-in commands, custom commands, call_command -> reference

• Logging -- Logging configuration, handlers, Django loggers -> reference

Deployment

• Deployment -- WSGI, ASGI, Gunicorn, Uvicorn, static files, checklist -> reference

Quick Patterns

Define a Model

from django.db import models

class Article(models.Model): title = models.CharField(max_length=200) slug = models.SlugField(unique=True) content = models.TextField() published = models.BooleanField(default=False) created_at = models.DateTimeField(auto_now_add=True) author = models.ForeignKey('auth.User', on_delete=models.CASCADE)

class Meta:
    ordering = ['-created_at']

def __str__(self):
    return self.title

Define a URL + View

urls.py

from django.urls import path from . import views

urlpatterns = [ path('articles/<int:pk>/', views.article_detail, name='article_detail'), ]

views.py

from django.shortcuts import render, get_object_or_404

def article_detail(request, pk): article = get_object_or_404(Article, pk=pk) return render(request, 'articles/detail.html', {'article': article})

Class-Based View

from django.views.generic import ListView, DetailView

class ArticleListView(ListView): model = Article queryset = Article.objects.filter(published=True) paginate_by = 20

class ArticleDetailView(DetailView): model = Article slug_field = 'slug'

QuerySet Filtering

from django.db.models import Q, F, Count

Complex filtering

articles = Article.objects.filter( Q(title__icontains='django') | Q(content__icontains='django'), published=True, ).exclude( author__is_active=False ).annotate( comment_count=Count('comments') ).order_by('-created_at')

Form with Validation

from django import forms

class ArticleForm(forms.ModelForm): class Meta: model = Article fields = ['title', 'slug', 'content', 'published']

def clean_title(self):
    title = self.cleaned_data['title']
    if len(title) < 5:
        raise forms.ValidationError('Title must be at least 5 characters.')
    return title

Cache a View

from django.views.decorators.cache import cache_page

@cache_page(60 * 15) # 15 minutes def article_list(request): articles = Article.objects.filter(published=True) return render(request, 'articles/list.html', {'articles': articles})

Signal Receiver

from django.db.models.signals import post_save from django.dispatch import receiver

@receiver(post_save, sender=Article) def notify_on_publish(sender, instance, created, **kwargs): if instance.published and created: send_notification(instance)

Management Command

from django.core.management.base import BaseCommand

class Command(BaseCommand): help = 'Process pending articles'

def add_arguments(self, parser):
    parser.add_argument('--limit', type=int, default=100)

def handle(self, *args, **options):
    count = process_articles(limit=options['limit'])
    self.stdout.write(self.style.SUCCESS(f'Processed {count} articles'))

Test Case

from django.test import TestCase

class ArticleTests(TestCase): def setUp(self): self.article = Article.objects.create( title='Test Article', slug='test-article', content='Content here', published=True, )

def test_article_detail_view(self):
    response = self.client.get(f'/articles/{self.article.pk}/')
    self.assertEqual(response.status_code, 200)
    self.assertContains(response, 'Test Article')

Best Practices

• Target Python 3.10+ and Django 6.0 with type hints where helpful

• Use class-based views for CRUD; function-based views for custom logic

• Prefer select_related/prefetch_related to avoid N+1 queries

• Use F expressions for database-level operations instead of Python

• Apply migrations atomically -- one logical change per migration

• Use Django's cache framework with Redis or Memcached in production

• Write TestCase tests with assertions specific to Django (assertContains, assertRedirects)

• Use custom user models from the start (AUTH_USER_MODEL)

• Enable CSRF protection everywhere -- never use @csrf_exempt without good reason

• Use environment variables for secrets -- never commit SECRET_KEY or database credentials

• Deploy with Gunicorn/Uvicorn behind a reverse proxy (nginx)

• Run manage.py check --deploy before every production deployment