No module TTL and expire

[codeasashu]

In my code, I am trying to use expire and TTL methods, which are natural to use when using redis cache backend. But they raise TypeError when unittesting with this library.

Steps to reproduce:

• Create a new django project: pip install django django_fakeredis pytest, django-admin startproject fakeredisbug
• Create example.py and example_test.py as provided below inside the application (path: fakeredisbug/fakeredisbug)
• Add cache settings to django settings (you can use dummy cache for now)
• run pytest: DJANGO_SETTINGS_MODULE=fakeredisbug.settings pytest. Observe the result

example.py

from django.core.cache import cache

def set_cache(key, val, expire):
   cache.set(key, val, expire)
   return cache.ttl(key)

example_test.py

from django_fakeredis.fakeredis import FakeRedis
from fakeredisbug.example import set_cache

@FakeRedis("fakeredisbug.example.cache")
def test_set_cache():
    expire = set_cache("a", "b", 300)
    assert expire == 300

Result:

============================================================= test session starts =============================================================
platform darwin -- Python 3.9.9, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
rootdir: /Users/ashutosh/code/office/test
collected 1 item

fakeredisbug/fakeredisbug/example_test.py F                                                                                             [100%]

================================================================== FAILURES ===================================================================
_______________________________________________________________ test_set_cache ________________________________________________________________

    @FakeRedis("fakeredisbug.example.cache")
    def test_set_cache():
>       expire = set_cache("a", "b", 300)

fakeredisbug/fakeredisbug/example_test.py:7:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
fakeredisbug/fakeredisbug/example.py:6: in set_cache
    return cache.ttl(key)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <django.utils.connection.ConnectionProxy object at 0x1040def70>, item = 'ttl'

    def __getattr__(self, item):
>       return getattr(self._connections[self._alias], item)
E       AttributeError: 'LocMemCache' object has no attribute 'ttl'

venv/lib/python3.9/site-packages/django/utils/connection.py:15: AttributeError
=========================================================== short test summary info ===========================================================
FAILED fakeredisbug/fakeredisbug/example_test.py::test_set_cache - AttributeError: 'LocMemCache' object has no attribute 'ttl'
============================================================== 1 failed in 0.14s ==============================================================