Django cache doesn't invalidate on change

Question

A cached page should be invalidated when something changes at the underlying resource. Django implements "site-wide" caching and I used this guide to setup my caching infrastructure (locally to test for now).

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
    }
}
SESSION_ENGINE = "django.contrib.sessions.backends.cache"
SESSION_CACHE_ALIAS = "default"
CACHE_TTL = 60 * 60 * 1
CACHE_MIDDLEWARE_SECONDS = CACHE_TTL

When I run my tests now, it works too well, as all tests fail, which change information in the database. Do I have to manually add a flag for cache invalidation? Should this even work (or are my settings wrong)? I saw this question, but in my case I don't use any decorators, but the side wide caching. Nevertheless I tested using the vary_on_headers('Authorisation',) which didn't change the test results.

had the same problem, never figured out how to fix that...

mfrischbutter
– mfrischbutter

2022-05-18 12:02:21 +00:00
Commented May 18, 2022 at 12:02 — mfrischbutter
– mfrischbutter, Commented May 18, 2022 at 12:02

creyD · Accepted Answer · 2022-05-18 13:50:48Z

1

As per this discussion in the Django forums, it seems like the automatic site caching isn't actually designed for this. It is more or less designed for caching a page until it expires, not until it is invalidated, because there is no way to invalidate a page manually.

There is always the way of using the caching backend manually though.

answered May 18, 2022 at 13:50

creyD

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