Include on single correspondents

src/documents/tests/test_api_objects.py

@@ -98,7 +98,7 @@ class TestApiObjects(DirectoriesMixin, APITestCase):
         WHEN:
             - API is called
         THEN:
-            - Last correspondence date is returned only if requested
+            - Last correspondence date is returned only if requested for list, and for detail
         """
 
         Document.objects.create(
@@ -114,6 +114,7 @@ class TestApiObjects(DirectoriesMixin, APITestCase):
             checksum="456",
         )
 
+        # Only if requested for list
         response = self.client.get(
             "/api/correspondents/",
         )
@@ -131,6 +132,16 @@ class TestApiObjects(DirectoriesMixin, APITestCase):
             results[0]["last_correspondence"],
         )
 
+        # Included in detail by default
+        response = self.client.get(
+            f"/api/correspondents/{self.c1.id}/",
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertIn(
+            "2022-01-02",
+            response.data["last_correspondence"],
+        )
+
 
 class TestApiStoragePaths(DirectoriesMixin, APITestCase):
     ENDPOINT = "/api/storage_paths/"

src/documents/views.py

@@ -279,6 +279,12 @@ class CorrespondentViewSet(ModelViewSet, PermissionsAwareDocumentCountMixin):
             )
         return super().list(request, *args, **kwargs)
 
+    def retrieve(self, request, *args, **kwargs):
+        self.queryset = self.queryset.annotate(
+            last_correspondence=Max("documents__created"),
+        )
+        return super().retrieve(request, *args, **kwargs)
+
 
 class TagViewSet(ModelViewSet, PermissionsAwareDocumentCountMixin):
     model = Tag