add confirmed count to statistics api response

backend/api/views/statistics.py

@@ -1,5 +1,6 @@
 import collections
 
+from django.conf import settings
 from django.db.models import Count, Q
 from django.shortcuts import get_object_or_404
 from rest_framework.permissions import IsAuthenticated
@@ -30,6 +31,10 @@ class StatisticsAPI(APIView):
             progress = self.progress(project=p)
             response.update(progress)
 
+        if not include or 'confirmed_count' in include:
+            confirmed_count = self.confirmed_count(p)
+            response['confirmed_count'] = confirmed_count
+
         if include:
             response = {key: value for (key, value) in response.items() if key in include}
 
@@ -59,3 +64,15 @@ class StatisticsAPI(APIView):
     def label_per_data(self, project):
         annotation_class = project.get_annotation_class()
         return annotation_class.objects.get_label_per_data(project=project)
+
+    def confirmed_count(self, project):
+        confirmed_count = {
+            settings.ROLE_ANNOTATOR: 0,
+            settings.ROLE_ANNOTATION_APPROVER: 0,
+            settings.ROLE_PROJECT_ADMIN: 0,
+        }
+        for doc in project.examples.all():
+            role_names = list(set([state.confirmed_user_role.name for state in doc.states.all()]))
+            for role_name in role_names:
+                confirmed_count[role_name] += 1
+        return confirmed_count