Store progress in Session model

musicrate/core/migrations/0003_session_offset.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.1.4 on 2022-12-17 18:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0002_session"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="session",
+            name="offset",
+            field=models.PositiveIntegerField(default=0),
+        ),
+    ]

musicrate/core/models.py

@@ -21,4 +21,5 @@ def session_token():
 
 class Session(models.Model):
     token = models.CharField(max_length=43, default=session_token, primary_key=True)
+    offset = models.PositiveIntegerField(default=0)
     playlist = models.ForeignKey(Playlist, on_delete=models.CASCADE)

musicrate/host/views.py

@@ -127,6 +127,10 @@ def view_artist(request, playlist, offset):
         try:
             session = Session.objects.get(pk=request.session['session'])
             session_url = get_absolute_join_session_url(request, session)
+
+            if session.offset < offset:
+                session.offset = offset
+                session.save()
         except Session.DoesNotExist:
             del request.session['session']
 

musicrate/vote/views.py

@@ -22,7 +22,10 @@ def join_session(request, session):
 def artist(request, playlist, offset=None):
     session = get_object_or_404(Session, pk=request.session.get('session'))
 
-    offset = offset or 0
+    offset = offset if offset != None else session.offset
+    if offset > session.offset:
+        return redirect('artist', playlist, session.offset)
+
     artists = session.playlist.artist_set
     artist = artists.order_by('id')[offset]