Add username property to Member model

backend/members/models.py

@@ -61,5 +61,9 @@ class Member(models.Model):
             message = 'This user is already assigned to a role in this project.'
             raise ValidationError(message)
 
+    @property
+    def username(self):
+        return self.user.username
+
     class Meta:
         unique_together = ('user', 'project')

backend/metrics/views.py

@@ -7,6 +7,7 @@ from rest_framework.response import Response
 from rest_framework.views import APIView
 
 from api.models import Example, ExampleState, Project, Annotation, Label, Category, CategoryType, Span, SpanType
+from members.models import Member
 from members.permissions import IsInProjectReadOnlyOrAdmin
 
 
@@ -24,9 +25,9 @@ class MemberProgressAPI(APIView):
     permission_classes = [IsAuthenticated & IsInProjectReadOnlyOrAdmin]
 
     def get(self, request, *args, **kwargs):
-        project = get_object_or_404(Project, pk=self.kwargs['project_id'])
         examples = Example.objects.filter(project=self.kwargs['project_id']).values('id')
-        data = ExampleState.objects.measure_member_progress(examples, project.users.all())
+        members = Member.objects.filter(project=self.kwargs['project_id'])
+        data = ExampleState.objects.measure_member_progress(examples, members)
         return Response(data=data, status=status.HTTP_200_OK)