Return DatasetChainModel

Fixes failure to serialize the response.

lib/galaxy/webapps/galaxy/api/datasets.py

@@ -47,7 +47,7 @@ from galaxy.webapps.galaxy.api.common import (
 )
 from galaxy.webapps.galaxy.services.datasets import (
     ConvertedDatasetsMap,
-    DatasetInheritanceChainEntry,
+    DatasetInheritanceChain,
     DatasetsService,
     DatasetStorageDetails,
     DatasetTextContentDetails,
@@ -122,7 +122,7 @@ class FastAPIDatasets:
         trans=DependsOnTrans,
         dataset_id: EncodedDatabaseIdField = DatasetIDPathParam,
         hda_ldda: DatasetSourceType = DatasetSourceQueryParam,
-    ) -> List[DatasetInheritanceChainEntry]:
+    ) -> DatasetInheritanceChain:
         return self.service.show_inheritance_chain(trans, dataset_id, hda_ldda)
 
     @router.get(

lib/galaxy/webapps/galaxy/services/datasets.py

@@ -104,6 +104,13 @@ class DatasetInheritanceChainEntry(Model):
     )
 
 
+class DatasetInheritanceChain(Model):
+    __root__: List[DatasetInheritanceChainEntry] = Field(
+        default=[],
+        title="Dataset inheritance chain",
+    )
+
+
 class ExtraFilesEntryClass(str, Enum):
     Directory = "Directory"
     File = "File"
@@ -310,7 +317,7 @@ class DatasetsService(ServiceBase, UsesVisualizationMixin):
         trans: ProvidesHistoryContext,
         dataset_id: EncodedDatabaseIdField,
         hda_ldda: DatasetSourceType = DatasetSourceType.hda,
-    ) -> List[DatasetInheritanceChainEntry]:
+    ) -> DatasetInheritanceChain:
         """
         Display inheritance chain for the given dataset.
         """
@@ -321,7 +328,7 @@ class DatasetsService(ServiceBase, UsesVisualizationMixin):
         for dep in inherit_chain:
             result.append(DatasetInheritanceChainEntry(name=f"{dep[0].name}", dep=dep[1]))
 
-        return result
+        return DatasetInheritanceChain(__root__=result)
 
     def update_permissions(
         self,

lib/galaxy_test/api/test_history_contents.py

@@ -163,7 +163,7 @@ class HistoryContentsApiTestCase(ApiTestCase):
         self._assert_status_code_is(show_response, 200)
         self.__assert_matches_hda(hda1, show_response.json())
 
-    def test_hda_copy(self):
+    def _create_copy(self):
         hda1 = self.dataset_populator.new_dataset(self.history_id)
         create_data = dict(
             source='hda',
@@ -173,7 +173,18 @@ class HistoryContentsApiTestCase(ApiTestCase):
         assert self.__count_contents(second_history_id) == 0
         create_response = self._post(f"histories/{second_history_id}/contents", create_data, json=True)
         self._assert_status_code_is(create_response, 200)
-        assert self.__count_contents(second_history_id) == 1
+        return create_response.json()
+
+    def test_hda_copy(self):
+        response = self._create_copy()
+        assert self.__count_contents(response['history_id']) == 1
+
+    def test_inheritance_chain(self):
+        response = self._create_copy()
+        inheritance_chain_response = self._get(f"datasets/{response['id']}/inheritance_chain")
+        self._assert_status_code_is_ok(inheritance_chain_response)
+        inheritance_chain = inheritance_chain_response.json()
+        assert len(inheritance_chain) == 1
 
     def test_library_copy(self):
         ld = self.library_populator.new_library_dataset("lda_test_library")