create all stories + story parts on round create

stories/writingtogether/views.py

@@ -27,23 +27,27 @@ class DetailView(generic.DetailView):
 class StoryRoundCreate(CreateView):
     model = StoryRound
     fields = ['name', 'participants', 'number_of_rounds']
+    success_url = reverse_lazy('writing:index')
 
     def form_valid(self, form):
         self.object = form.save()
+        sorted_participants = sorted(form.cleaned_data['participants'])
+        number_of_participants = len(sorted_participants)
 
-        for user in form.cleaned_data['participants']:
-            participant = Participant.objects.create(
-                user=user,
-                order_by=1,  # TODO: get order by from form
-                story_round=self.object
-            )
-
-            Story.objects.create(
+        for user in sorted_participants:
+            story = Story.objects.create(
                 part_of_round=self.object,
-                started_by=participant
+                started_by=user
             )
 
-        return HttpResponseRedirect(self.get_success_url())
+            previous_part=None
+            for i in range(form.cleaned_data['number_of_rounds']):
+                current_part = StoryPart.objects.create(
+                    user=sorted_participants[i % number_of_participants],
+                    previous_part=previous_part,
+                    part_of=story
+                )
+                previous_part = current_part
 
 
 class StoryUpdate(UpdateView):