Proxy models create different Python behavior for the same database table. I set proxy = True in Meta. This adds methods or changes default ordering without new tables. Proxy models share the same table as the original. Use cases include different man

Custom template filters transform variables in templates. I decorate functions with @register.filter and optionally set is_safe=True for HTML output. Filters take one or two arguments. For formatting dates, numbers, or text, filters keep logic out of

Streaming responses serve large files without loading them entirely into memory. I use StreamingHttpResponse or FileResponse for file downloads. For CSV generation, I yield rows incrementally. The generator pattern keeps memory usage constant regardle

Connection pooling reuses database connections instead of creating new ones per request. I use django-db-pool or configure persistent connections with CONN_MAX_AGE. This reduces connection overhead significantly. For high-traffic sites, I set appropri

Custom auth backends enable alternative authentication methods. I subclass ModelBackend and override authenticate(). Common use cases include email login, LDAP, OAuth, or custom token auth. The backend returns a user object or None. I add it to AUTHEN

ContentTypes enable generic foreign keys pointing to any model. I use GenericForeignKey for features like comments, tags, or favorites on multiple content types. The framework tracks all installed models. I query with content_type and object_id. For r

Django's message framework provides one-time notifications to users. I use messages.success(), messages.error(), messages.warning(), and messages.info() to add messages. Messages persist across redirects and are displayed once. I configure message sto

The clean() method validates model instances before saving. I raise ValidationError for invalid data. This runs on form submission and can be called explicitly with full_clean(). I validate cross-field constraints that can't be expressed as field vali

Sitemaps help search engines discover and index pages. Django's sitemap framework generates XML sitemaps automatically. I create sitemap classes for each content type, defining items(), lastmod(), changefreq(), and priority(). For large sites, I use s

Celery Beat schedules periodic tasks like cron jobs. I define schedules in settings or use the Django database scheduler. Tasks run at specified intervals or cron expressions. I use @periodic_task decorator or configure in CELERY_BEAT_SCHEDULE. For dy

select_for_update() locks rows until transaction completes, preventing race conditions. I use it for operations requiring read-modify-write atomicity like decrementing stock or updating counters. The lock is released on transaction commit/rollback. Fo

Model Meta class controls database behavior. I use ordering for default query ordering, indexes for database indexes, and unique_together for composite uniqueness constraints. The db_table option customizes table names. For large tables, managed=False