Get the cache backend

        Returns
        ~~~~~~~
        Django cache backend

def cache_backend(self):
        """
        Get the cache backend

        Returns
        ~~~~~~~
        Django cache backend

        """
        if not hasattr(self, '_cache_backend'):
            if hasattr(django.core.cache, 'caches'):
                self._cache_backend = django.core.cache.caches[_cache_name]
            else:
                self._cache_backend = django.core.cache.get_cache(_cache_name)

        return self._cache_backend