Django caches user object-CodePudding

Our websites sometimes has around 600 authenticated users trying to register for an event in a timeframe of 5 min. We have a VPS with 1 CPU and 1GB ram. On these moments the site slows down and gives a 502 error.

For that reason I'm using per-site cache with FileBasedCache. This works excellent and stress tests work fine.

But, when people login, they're redirect to their profile. This is the code:

class UserRedirectView(LoginRequiredMixin, RedirectView):

    permanent = False

    def get_redirect_url(self):
        return reverse("users:detail", kwargs={"membership_number": self.request.user.membership_number})

the user is redirect to an url with their membership_number

class UserDetailView(LoginRequiredMixin, DetailView):

    model = User
    slug_field = "membership_number"
    slug_url_kwarg = "membership_number"

Some users are reporting that they are redirected to someone else his/her profile after logging in.

How does this work? How to prevent user specific parts of the website to be cached? e.g. users also see a list of events that are specific to the groups they are in. In other words, every user should see a different list.

Any ideas? Best practices?

CodePudding user response：

you should be able to vary cache on cookie so that logged in users (assuming cookie based auth) get another cache key.

from django.views.decorators.vary import vary_on_cookie
@vary_on_cookie
def my_view(request):
    pass

https://docs.djangoproject.com/en/dev/topics/cache/#controlling-cache-using-other-headers and https://docs.djangoproject.com/en/dev/topics/cache/#using-vary-headers