Show - Use .annotate for submissions with votes and their ordering

Show/views.py

@@ -3,8 +3,10 @@ from django.shortcuts import render
 from django.views import View
 from django.views.generic.base import TemplateView
 from django.conf import settings
+from django.http import Http404
 from django.http import HttpResponse
 from django.http import HttpResponseRedirect
+from django.db.models import Case, When, Value, IntegerField, Count, F
 
 from LandingPage.models import Show
 from LandingPage.models import Season
@@ -13,35 +15,66 @@ from LandingPage.models import Submission
 
 # Create your views here.
 
+# Index page of a show
 class IndexView(TemplateView):
     template_name = "show.html"
 
     def get_context_data(self, abbreviation, **kwargs):
         ctx = super().get_context_data()
-        ctx['show'] = Show.objects.filter(abbr=abbreviation).first()
-        ctx['seasons'] = Season.objects.filter(show=ctx['show'])
-        ctx['episodes'] = Episode.objects.filter(show=ctx['show']).count()
+
+        # Get show by abbreviation, add episode count to the show and return only the first object
+        show = Show.objects.filter(abbr=abbreviation).annotate(episode_count=Count('episodes')).first()
+
+        # 404
+        if not show:
+            raise Http404("Show does not exist")
+
+        # Get all seasons of the show and annotate episode counts onto them
+        seasons = show.seasons.all().annotate(episode_count=Count('episodes'))
+
+        # Add fields to context
+        ctx['show'] = show
+        ctx['seasons'] = seasons
+
         return ctx
 
+# Episodes page of a show
 class EpisodeView(TemplateView):
     template_name = "episode.html"
 
     def get_context_data(self, abbreviation, season, episode, **kwargs):
         ctx = super().get_context_data()
-        ctx['show'] = Show.objects.filter(abbr=abbreviation).first()
-        ctx['episode'] = Episode.objects.filter(show=ctx['show'],episode=episode).first()
 
-        if not ctx['episode']:
-            return ctx
+        # Get show by abbreviation
+        show = Show.objects.filter(abbr=abbreviation).first()
 
-        # If you're smarter than me, maybe you can compress the next 8 lines into fewer ones by some django magic I'm not aware of
-        submissions = ctx['episode'].submissions.all()
+        # Get episode by season and episode number
+        episode = Episode.objects.filter(show=show,episode=episode).first()
 
-        for sbm in submissions:
-            sbm.positives = sbm.votes.filter(positive=True).count()
-            sbm.negatives = sbm.votes.count() - sbm.positives
+        # 404's
+        if not show:
+            raise Http404("Show does not exist")
         
-        # sorts by "score", TODO: less bullshit
-        ctx['submissions'] = reversed(sorted(submissions, key=lambda x: x.positives - x.negatives))
+        if not episode:
+            raise Http404("Episode does not exist")
+
+        # I aknowledge that this is a mess. A functional mess. But a mess nonetheless. Hey, that rhymed!
+        submissions = episode.submissions.annotate(
+            positives=Count(
+                Case(
+                    When(
+                        votes__positive=True,
+                        then=Value(1)
+                        )
+                    )
+                ),
+            negatives=Count('votes') - F('positives'),
+            score=F('positives') - F('negatives')
+        ).order_by('-score')
+
+        # Add fields to context
+        ctx['show'] = show
+        ctx['episode'] = episode
+        ctx['submissions'] = submissions
 
         return ctx