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Django With Redis Caching

1.2 Django with Redis caching​

Overview​

note

Caching is like having a speedy storage spot for data that's frequently used or costly to fetch. In Django, integrating Redis as a caching solution speeds up data retrieval, making your applications snappier and more efficient. Let's dive into how to set this up!

Installation​

1. Install Necessary Packages

Install the following packages by adding them to your project dependencies:

redis[hiredis]==5.0.7
django-debug-toolbar==4.4.6

2. Update Your Settings

In your settings.py, make the following changes:

  • Debug Toolbar: Useful for monitoring cache performance among other things, ensure it's enabled only in debug mode for security.
if DEBUG:
  INTERNAL_IPS = ["127.0.0.1"]

INSTALLED_APPS = [
  ...  # Other apps
  "debug_toolbar",
]

MIDDLEWARE = [
  ...  # Other middleware
  "debug_toolbar.middleware.DebugToolbarMiddleware",
]

CACHES = {
  "default": {
    "BACKEND": "django.core.cache.backends.redis.RedisCache",
    "LOCATION": "redis://localhost:6378/",
    "KEY_PREFIX": "manga",
    "TIMEOUT": 60 * 1,  # 1 minute
  }
}

CACHE_TTL = 60 * 5  # Cache time to live is 5 minutes.

3. Configure URLs

Make sure the Debug Toolbar is accessible by configuring your urls.py accordingly:

urlpatterns = [
  path("admin/", admin.site.urls),
  path("", include("news.urls")),
  path("shop/", include("stationery.urls")),
  path("__debug__/", include("debug_toolbar.urls")),
]

4. Enable Caching in Views

Leverage Django's caching capabilities in your views to minimize database hits:

from django.shortcuts import render
from django.views.decorators.cache import cache_page
from .models import Category
from .helper import chunk_array

CACHE_TTL = getattr(settings, 'CACHE_TTL', DEFAULT_TIMEOUT)

@cache_page(CACHE_TTL)
def index(request):
  items_category = cache.get('cache_items_category')
  if not items_category:
    items_category = Category.objects.filter(
      is_show_on_homepage=True,
      status=APP_VALUE_CATEGORY_CHOICE_STATUS_DEFAULT
    ).order_by('name')
    cache.set('cache_items_category', items_category, 20)  # 20 seconds expire

By decorating your view functions with @cache_page, you define how long each page should be stored in the cache, drastically reducing load times and improving user experience.

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Reference​

Check out these additional resources to further enhance your understanding of caching in Django with Redis: