customized cached_with for django-cache-machine to use with django-tastypie

tastypie_caching.py

from caching.base import cached_with as official_cached_with


def cached_with(obj, f, f_key, timeout=None):
    """Helper for caching a function call within an object's flush list."""
    if hasattr(obj, "exists") and not obj.exists():
        return f()
    return official_cached_with(obj, f, f_key, timeout=timeout)