Get list of Cache Keys in Django

Question

I'm trying to understand how Django is setting keys for my views. I'm wondering if there's a way to just get all the saved keys from Memcached. something like a cache.all() or something. I've been trying to find the key with cache.has_key('test') but still cant figure out how the view keys are being named.

UPDATE: The reason I need this is because I need to manually delete parts of the cache but dont know the key values Django is setting for my cache_view key

Solution 1

You can use http://www.darkcoding.net/software/memcached-list-all-keys/ as explained in How do I check the content of a Django cache with Python memcached?

Solution 2

For RedisCache you can get all available keys with.

from django.core.cache import cache

cache.keys('*')

Solution 3

As mentioned there is no way to get a list of all cache keys within django. If you're using an external cache (e.g. memcached, or database caching) you can inspect the external cache directly.

But if you want to know how to convert a django key to the one used in the backend system, django's make_key() function will do this.

https://docs.djangoproject.com/en/1.8/topics/cache/#cache-key-transformation

>>> from django.core.cache import caches
>>> caches['default'].make_key('test-key')
u':1:test-key'

Solution 4

Switch to using LocMemCache instead of MemcachedCache:

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
        'LOCATION': 'unique-snowflake',
    }
}

Then see the question Contents of locmem cache in Django?:

from django.core.cache.backends import locmem
print(locmem._caches)

Solution 5

The Memcached documentation recommends that instead of listing all the cache keys, you run memcached in verbose mode and see everything that gets changed. You should start memcached like this

memcached -vv

and then it will print the keys as they get created/updated/deleted.

View more solutions

Comments

[Karam Haj]

'RedisCache' object has no attribute 'keys'

[Eduard Mukans]

@KaramHaj I think for newer versions you can try to use cache.get('*')

[Nwawel A Iroume]

@KaramHaj cache.get('*') returns None instead of every keys like cache.keys('*'). Tested on django 3.2.3 and redis 3.5.3

[JJK]

This is the answer I was looking for.

[JJK]

This answer does not work for RedisCache that is provided by Django 4+ See my answer below for more details.

[JJK]

Note this does not work for the RedisCache backend that is provided with Django>=4. See my answer below for more details.

[softarn]

Ah yea, django 3.2 here