Add reset assignment endpoint

backend/examples/urls.py

@@ -1,6 +1,6 @@
 from django.urls import path
 
-from .views.assignment import AssignmentDetail, AssignmentList
+from .views.assignment import AssignmentDetail, AssignmentList, ResetAssignment
 from .views.comment import CommentDetail, CommentList
 from .views.example import ExampleDetail, ExampleList
 from .views.example_state import ExampleStateList
@@ -8,6 +8,7 @@ from .views.example_state import ExampleStateList
 urlpatterns = [
     path(route="assignments", view=AssignmentList.as_view(), name="assignment_list"),
     path(route="assignments/<uuid:assignment_id>", view=AssignmentDetail.as_view(), name="assignment_detail"),
+    path(route="assignments/reset", view=ResetAssignment.as_view(), name="assignment_reset"),
     path(route="examples", view=ExampleList.as_view(), name="example_list"),
     path(route="examples/<int:example_id>", view=ExampleDetail.as_view(), name="example_detail"),
     path(route="comments", view=CommentList.as_view(), name="comment_list"),

backend/examples/views/assignment.py

@@ -1,7 +1,8 @@
 from django.shortcuts import get_object_or_404
 from django_filters.rest_framework import DjangoFilterBackend
-from rest_framework import filters, generics
+from rest_framework import filters, generics, status
 from rest_framework.permissions import IsAuthenticated
+from rest_framework.views import APIView, Response
 
 from examples.models import Assignment
 from examples.serializers import AssignmentSerializer
@@ -33,3 +34,15 @@ class AssignmentDetail(generics.RetrieveUpdateDestroyAPIView):
     serializer_class = AssignmentSerializer
     lookup_url_kwarg = "assignment_id"
     permission_classes = [IsAuthenticated & (IsProjectAdmin | IsProjectStaffAndReadOnly)]
+
+
+class ResetAssignment(APIView):
+    permission_classes = [IsAuthenticated & IsProjectAdmin]
+
+    @property
+    def project(self):
+        return get_object_or_404(Project, pk=self.kwargs["project_id"])
+
+    def delete(self, *args, **kwargs):
+        Assignment.objects.filter(project=self.project).delete()
+        return Response(status=status.HTTP_204_NO_CONTENT)