Go to next artist automatically when enough participants have voted

musicrate/host/templates/host/view_artist.html

@@ -41,5 +41,16 @@
 	{% qrcode session_url %}
 	{{ session_url }}
 </div>
+{% if offset < count|add:-1 %}
+<script>
+setInterval(async () => {
+	const response = await fetch('/may_advance?');
+	const may_advance = await response.json();
+	if (may_advance === true) {
+		location = '{% url 'view_artist' playlist offset|add:1 %}';
+	}
+}, 3000);
+</script>
+{% endif %}
 {% endif %}
 {% endblock %}

musicrate/host/urls.py

@@ -8,6 +8,7 @@ urlpatterns = [
         path('', views.break_view, name='break'),
         path('add/', views.add_break_content, name='add_break_content'),
     ])),
+    path('may_advance/', views.may_advance, name='may_advance'),
     path('session/', views.session, name='session'),
     path('<slug:playlist>/', include([
         path('', views.playlist, name='playlist'),

musicrate/host/views.py

@@ -2,6 +2,7 @@ from django.conf import settings
 from django.contrib.auth.decorators import login_required
 from django.db import transaction
 from django.db.models import F, Min
+from django.http import JsonResponse
 from django.shortcuts import get_object_or_404, redirect, render
 from django.urls import reverse
 from django.utils import timezone
@@ -11,6 +12,7 @@ from .forms import AddBreakContentForm, CreatePlaylistForm
 from .models import BreakContent
 from .spreadsheet import get_sheet_data
 from ..core.models import Artist, Playlist, Session
+from ..vote.models import Rating
 
 def get_absolute_join_session_url(request, session):
     return request.build_absolute_uri(reverse('join_session', args=(session.pk,)))
@@ -125,6 +127,18 @@ def add_break_content(request):
 
     return render(request, 'host/add_break_content.html', {'form': form})
 
+@login_required
+def may_advance(request):
+    session = get_object_or_404(Session, pk=request.session.get('session'))
+    artist = session.playlist.artist_set.order_by('id')[session.offset]
+
+    num_participants = session.participant_set.count()
+    if num_participants == 0:
+        return JsonResponse(False, safe=False)
+
+    ratio = Rating.objects.filter(artist=artist, participant__session=session).count() / num_participants
+    return JsonResponse(ratio >= settings.ADVANCE_THRESHOLD, safe=False)
+
 @login_required
 def session(request):
     if 'session' in request.session:

musicrate/settings.py

@@ -164,3 +164,5 @@ RATING_CHOICES = (
 BREAK_INTERVAL = int(getenv('BREAK_INTERVAL', 30)) # minutes
 
 LOGIN_URL = '/admin/login/'
+
+ADVANCE_THRESHOLD = float(getenv('ADVANCE_THRESHOLD', 0.6))