Django Redis Caching Skill

Implements Redis caching with django-cacheops for the DTX Django backend.

Quick Reference

Cacheops Configuration

All models use 1-hour cache timeout (configured in settings.py):

CACHEOPS = {
    "app.tournament": {"ops": "all", "timeout": 60 * 60},
    "app.team": {"ops": "all", "timeout": 60 * 60},
    "app.customuser": {"ops": "all", "timeout": 60 * 60},
    "app.draft": {"ops": "all", "timeout": 60 * 60},
    "app.game": {"ops": "all", "timeout": 60 * 60},
    "app.draftround": {"ops": "all", "timeout": 60 * 60},
}

View Caching Pattern

from cacheops import cached_as

def list(self, request, *args, **kwargs):
    cache_key = f"model_list:{request.get_full_path()}"

    @cached_as(Model1, Model2, extra=cache_key, timeout=60 * 60)
    def get_data():
        queryset = self.filter_queryset(self.get_queryset())
        serializer = self.get_serializer(queryset, many=True)
        return serializer.data

    return Response(get_data())

Cache Invalidation Pattern

from cacheops import invalidate_obj, invalidate_model

def save(self, *args, **kwargs):
    super().save(*args, **kwargs)
    # Invalidate specific instance
    invalidate_obj(self.related_obj)
    # Invalidate entire model cache
    invalidate_model(RelatedModel)

DTX Model Cache Dependencies

When modifying data, invalidate these related caches:

Key Principles

1. Invalidate on Write: Always invalidate related caches after mutations
2. Monitor Dependencies: Use @cached_as(Model1, Model2, ...) to auto-invalidate
3. Use Specific Keys: Include request path or pk in cache keys
4. Keep Fresh for Detail: Use keep_fresh=True for single-object retrieval

Detailed References

• Cacheops Patterns - Decorator usage, cache keys
• Invalidation Strategies - When and how to invalidate
• Model Dependencies - DTX model relationships

Common Operations

Disable Cache for Management Commands

DISABLE_CACHE=true python manage.py <command>

Manual Cache Invalidation

from cacheops import invalidate_all, invalidate_model, invalidate_obj

# Nuclear option - invalidate everything
invalidate_all()

# Invalidate all instances of a model
invalidate_model(Tournament)

# Invalidate specific instance
invalidate_obj(tournament)

Check if Cache is Working

from django.core.cache import cache
cache.set('test_key', 'test_value', 30)
print(cache.get('test_key'))  # Should print 'test_value'

Timeout Guidelines