aircox/views/episode_detail: when episode page is unpublished and user not authorized, redirect to parent program page

aircox/views/episode.py

@@ -1,5 +1,5 @@
 from django.contrib.auth.mixins import UserPassesTestMixin
-from django.http import HttpResponseRedirect
+from django.http import Http404, HttpResponseRedirect
 from django.shortcuts import get_object_or_404
 from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
@@ -40,6 +40,17 @@ class EpisodeDetailView(PageDetailView):
     def get_related_url(self):
         return reverse("episode-list", kwargs={"parent_slug": self.object.parent.slug})
 
+    def get(self, *args, **kwargs):
+        """When episode is unpublished and user not authorized, redirect to
+        parent page."""
+        try:
+            self.object = super().get_object()
+        except Http404:
+            episode = get_object_or_404(Episode, slug=self.kwargs["slug"])
+            return HttpResponseRedirect(reverse("program-detail", kwargs={"slug": episode.program.slug}))
+        context = self.get_context_data(object=self.object)
+        return self.render_to_response(context)
+
 
 @attach
 class EpisodeListView(PageListView):