A very simple base for an endpoint that displays basic stats

core/views/common_views.py

@@ -4,6 +4,7 @@ user to be authenticated and most are only accessible by one user group """
 import logging
 
 from django.conf import settings
+from django.db.models import Avg
 from rest_framework import generics, mixins, viewsets
 from rest_framework.decorators import api_view
 from rest_framework.response import Response
@@ -84,6 +85,25 @@ class SubmissionTypeApiView(viewsets.ReadOnlyModelViewSet):
     serializer_class = SubmissionTypeSerializer
 
 
+class StatisticsEndpoint(viewsets.ViewSet):
+
+    def list(self, request, *args, **kwargs):
+        return Response({
+            'submissions_per_type':
+            models.SubmissionType.objects.first().submissions.count(),
+
+            'submissions_per_student':
+            models.SubmissionType.objects.count(),
+
+            'current_mean_score':
+            models.Feedback.objects.aggregate(avg=Avg('score')).get('avg', 0),
+
+            'submission_type_progress':
+                models.SubmissionType.get_annotated_feedback_count().values(
+                    'feedback_count', 'pk', 'percentage')
+        })
+
+
 class SubmissionViewSet(viewsets.ReadOnlyModelViewSet):
     permission_classes = (IsTutorOrReviewer, )
     serializer_class = SubmissionNoTypeSerializer