Add user_uid to api output

crc/models/file.py

@@ -116,6 +116,7 @@ class File(object):
             instance.last_modified = data_model.date_created
             instance.latest_version = data_model.version
             instance.size = data_model.size
+            instance.user_uid = data_model.user_uid
         else:
             instance.last_modified = None
             instance.latest_version = None
@@ -143,7 +144,7 @@ class FileSchema(Schema):
         fields = ["id", "name", "is_status", "is_reference", "content_type",
                   "primary", "primary_process_id", "workflow_spec_id", "workflow_id",
                   "irb_doc_code", "last_modified", "latest_version", "type", "size", "data_store",
-                  "document"]
+                  "document", "user_uid"]
         unknown = INCLUDE
     type = EnumField(FileType)