diff --git a/lib/galaxy/managers/datasets.py b/lib/galaxy/managers/datasets.py
index 6480a990e1c..44e5dbe4b21 100644
--- a/lib/galaxy/managers/datasets.py
+++ b/lib/galaxy/managers/datasets.py
@@ -383,6 +383,9 @@ class _UnflattenedMetadataDatasetAssociationSerializer( base.ModelSerializer,
             'meta_files'    : self.serialize_meta_files,
             'metadata'      : self.serialize_metadata,
 
+            'creating_job'  : self.serialize_creating_job,
+            'rerunnable'    : self.serialize_rerunnable,
+
             'parent_id'     : self.serialize_id,
             'designation'   : lambda i, k, **c: i.designation,
 
@@ -446,6 +449,27 @@ class _UnflattenedMetadataDatasetAssociationSerializer( base.ModelSerializer,
 
         return metadata
 
+    def serialize_creating_job( self, dataset, key, **context ):
+        """
+        Return the id of the Job that created this dataset (or its original)
+        or None if no `creating_job` is found.
+        """
+        if dataset.creating_job:
+            return self.serialize_id( dataset.creating_job, 'id' )
+        else:
+            return None
+
+    def serialize_rerunnable( self, dataset, key, **context ):
+        """
+        Return False if this tool that created this dataset can't be re-run
+        (e.g. upload).
+        """
+        if dataset.creating_job:
+            tool = self.app.toolbox.get_tool( dataset.creating_job.tool_id, dataset.creating_job.tool_version )
+            if tool and tool.is_workflow_compatible:
+                return True
+        return False
+
     def serialize_converted_datasets( self, dataset_assoc, key, **context ):
         """
         Return a file extension -> converted dataset encoded id map with all
diff --git a/lib/galaxy/managers/hdas.py b/lib/galaxy/managers/hdas.py
index 5165098bbfe..1ff4f98ff0f 100644
--- a/lib/galaxy/managers/hdas.py
+++ b/lib/galaxy/managers/hdas.py
@@ -328,9 +328,6 @@ class HDASerializer(  # datasets._UnflattenedMetadataDatasetAssociationSerialize
             'file_path'     : self._remap_from( 'file_name' ),
 
             'resubmitted'   : lambda i, k, **c: self.hda_manager.has_been_resubmitted( i ),
-            'creating_job'  : self.serialize_creating_job,
-            'rerunnable' : self.rerunnable,
-
             'display_apps'  : self.serialize_display_apps,
             'display_types' : self.serialize_old_display_applications,
             'visualizations': self.serialize_visualization_links,
@@ -435,19 +432,6 @@ class HDASerializer(  # datasets._UnflattenedMetadataDatasetAssociationSerialize
         }
         return urls
 
-    def serialize_creating_job( self, hda, key, **context ):
-        if hda.creating_job:
-            return self.app.security.encode_id(hda.creating_job.id),
-        else:
-            return None
-
-    def rerunnable( self, hda, key, **context ):
-        if hda.creating_job:
-            tool = self.app.toolbox.get_tool(hda.creating_job.tool_id, hda.creating_job.tool_version)
-            if tool and tool.is_workflow_compatible:
-                return True
-        return False
-
 
 class HDADeserializer( datasets.DatasetAssociationDeserializer,
                        taggable.TaggableDeserializerMixin,