Merge pull request #402 from nationalarchives/feature/expose-latest-m…

…anifestation-type

Expose how the latest version came into being

src/caselawclient/models/documents.py

@@ -216,6 +216,16 @@ def get_latest_manifestation_datetime(
         else:
             return max(events)
 
+    def get_latest_manifestation_type(self) -> Optional[str]:
+        return max(
+            (
+                (type, time)
+                for type in ["transform", "tna-enriched"]
+                if (time := self.get_latest_manifestation_datetime(type))
+            ),
+            key=lambda x: x[1],
+        )[0]
+
     @cached_property
     def transformation_datetime(self) -> Optional[datetime.datetime]:
         return self.get_latest_manifestation_datetime("transform")

tests/models/test_documents.py

@@ -575,6 +575,7 @@ def test_dates(self, mock_api_client):
         assert document.enrichment_datetime.year == 2024
         assert document.transformation_datetime.year == 2026
         assert document.get_latest_manifestation_datetime().year == 2026
+        assert document.get_latest_manifestation_type() == "transform"
         assert [
             x.year for x in document.get_manifestation_datetimes("tna-enriched")
         ] == [2024, 2023]