Add migration for pre-1.0.0-rc.1 Stats Object

Author: duckontheweb

pystac/serialization/migrate.py

@@ -20,10 +20,23 @@ def _migrate_catalog(
         d["stac_extensions"] = list(info.extensions)
 
 
+def _migrate_collection_summaries(
+    d: Dict[str, Any], version: STACVersionID, info: STACJSONDescription
+) -> None:
+    if version < "1.0.0-rc.1":
+        for prop, summary in d.get("summaries", {}).items():
+            if isinstance(summary, dict) and "min" in summary and "max" in summary:
+                d["summaries"][prop] = {
+                    "minimum": summary["min"],
+                    "maximum": summary["max"],
+                }
+
+
 def _migrate_collection(
     d: Dict[str, Any], version: STACVersionID, info: STACJSONDescription
 ) -> None:
     _migrate_catalog(d, version, info)
+    _migrate_collection_summaries(d, version, info)
 
 
 def _migrate_item(

tests/serialization/test_migrate.py

@@ -10,7 +10,7 @@
     merge_common_properties,
     migrate_to_latest,
 )
-from pystac.utils import str_to_datetime
+from pystac.utils import str_to_datetime, get_required
 
 from tests.utils import TestCases
 
@@ -83,3 +83,16 @@ def test_migrates_renamed_extension(self) -> None:
 
         self.assertTrue(ItemAssetsExtension.has_extension(collection))
         self.assertIn("item_assets", collection.extra_fields)
+
+    def test_migrates_pre_1_0_0_rc1_stats_summary(self) -> None:
+        collection = pystac.Collection.from_file(
+            TestCases.get_path(
+                "data-files/examples/1.0.0-beta.2/collection-spec/"
+                "examples/sentinel2.json"
+            )
+        )
+        datetime_summary = get_required(
+            collection.summaries.get_range("datetime"), collection.summaries, "datetime"
+        )
+        self.assertEqual(datetime_summary.minimum, "2015-06-23T00:00:00Z")
+        self.assertEqual(datetime_summary.maximum, "2019-07-10T13:44:56Z")