metrics: Do not fail when tables not migrated

marietje/metrics/views.py

@@ -1,5 +1,7 @@
 from django.db.models import Count, Q
 from django.http import HttpResponse
+from django.db.utils import OperationalError
+
 from prometheus_client import generate_latest, Gauge
 
 from queues.models import Queue, PlaylistSong
@@ -11,8 +13,8 @@ queue_duration_gauge = Gauge('marietje_queue_duration', 'Marietje queue duration
 # Export the amount of different users in the queue
 queue_users_gauge = Gauge('marietje_queue_users', 'Users holding a queue at some point', ['name'])
 
-
-for queue in Queue.objects.all():
+try:
+    for queue in Queue.objects.all():
         def _get_queue_length():
             return (PlaylistSong.objects.filter(playlist=queue.playlist_id, state=0)
                                         .count())
@@ -35,6 +37,9 @@ for queue in Queue.objects.all():
         queue_duration_gauge.labels(name=queue).set_function(_get_queue_duration)
         queue_users_gauge.labels(name=queue).set_function(_get_queue_distinct_users)
 
+except OperationalError:
+    pass
+
 
 def metrics(request):
     return HttpResponse(generate_latest(), content_type="text/plain")