code: def hide_announcement_view(request):
      
      if request.method == "POST":
          announcement_id = request.POST.get("announcement_id")
          if announcement_id:
              announcement = Announcement.objects.get(id=announcement_id)
              try:
                  announcement.user_map.users_hidden.add(request.user)
                  announcement.user_map.save()
              except IntegrityError:
                  logger.warning("Duplicate value when hiding announcement {} for {}.".format(announcement_id, request.user.username))
              return http.HttpResponse("Hidden")
          raise http.Http404
      else:
          return http.HttpResponseNotAllowed(["POST"], "HTTP 405: METHOD NOT ALLOWED")
docs: Hide an announcement for the logged-in user.
  
          announcements_hidden in the user model is the related_name for
          "users_hidden" in the announcement model.