"""
A decorator to bypass per-site cache if the user is authenticated. Based on django.views.decorators.cache.never_cache.
See: http://stackoverflow.com/questions/12060036/why-django-1-4-per-site-cache-does-not-work-correctly-with-cache-middleware-anon
"""     
        
from django.utils.decorators import available_attrs
from django.utils.cache import add_never_cache_headers
from functools import wraps

def conditional_cache(view_func):
    """
    Checks the user and if it's authenticated pass it through never_cache.
    This version uses functools.wraps for the wrapper function.
    """ 
    @wraps(view_func, assigned=available_attrs(view_func))
    def _wrapped_view_func(request, *args, **kwargs):
        response = view_func(request, *args, **kwargs)
        if request.user.is_authenticated():
            add_never_cache_headers(response)
        return response
    return _wrapped_view_func