django

name	Django
slug	django
version	1.0.3
description	Builds, debugs, and hardens Django apps: models, the ORM, views, templates, forms, the admin, DRF APIs, and deployment. Use when a page fires one query per row (N+1, select_related, prefetch_related, annotate double-counting); when makemigrations conflicts, a migration locks a live table, or InconsistentMigrationHistory blocks a deploy; on 403 CSRF verification failed, DEBUG=False turning every request into 400 DisallowedHost or a blank 500, or SECURE_SSL_REDIRECT looping behind a proxy; on SynchronousOnlyOperation, AppRegistryNotReady, or NoReverseMatch; when a background task runs before its transaction commits, signals fire on rows that roll back, or update() skips auto_now; when the admin times out on a big table, collectstatic breaks static files, or workers exhaust database connections; when writing serializers, formsets, a custom user model, permissions, or assertNumQueries tests; or upgrading Django across a deprecation. Not for plain Python, FastAPI or Flask services, or engine-level SQL tuning.
homepage	https://clawic.com/skills/django
changelog	Display name shown correctly
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User preferences and memory live in ~/Clawic/data/django/ (see setup.md on first use, memory-template.md for the file format). If you have data at an old location (~/django/ or ~/clawic/django/), move it to ~/Clawic/data/django/, and say in one line that you moved it and from where.

When To Use

• Writing or reviewing Django models, migrations, views, forms, templates, admin classes, or DRF serializers
• A page is slow or the query count grows with the number of rows on screen
• A migration will not generate, will not apply, conflicts after a merge, or would lock a production table
• An exception that is Django's and not Python's: SynchronousOnlyOperation, TransactionManagementError, AppRegistryNotReady, NoReverseMatch, DisallowedHost, ImproperlyConfigured
• Hardening a project for production: settings split, check --deploy, static and media, sessions, permissions, upload limits
• Background jobs, async views, Channels, caching, or a test suite that is slow or order-dependent
• Not for plain Python semantics, packaging, or asyncio internals, and not for engine-level SQL tuning (see Related Skills)

Quick Reference

Situation	Play
Query count grows with rows on the page	select_related for forward FK/O2O, prefetch_related for reverse FK/M2M (Core Rules 1-2, → orm.md)
Sum/Count inflated after annotate	Two joins multiply rows — Count("x", distinct=True) or a Subquery (→ orm.md)
Rows come back duplicated after filtering on a related model	Chained .filter().filter() joins twice; one .filter(a=..., b=...) requires the same related row (→ orm.md)
makemigrations reports "No changes detected"	App missing from INSTALLED_APPS, or models defined outside an imported module (→ )