X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/77d9c05d89dabc9e9e9a15f46cd12c8ad61ed64e..5950f9090f499c770908622bd300d98f9f1da1fc:/services/api/lib/serializers.rb

diff --git a/services/api/lib/serializers.rb b/services/api/lib/serializers.rb
index e412f63f62..37734e0bb4 100644
--- a/services/api/lib/serializers.rb
+++ b/services/api/lib/serializers.rb
@@ -1,3 +1,7 @@
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
 require 'safe_json'
 
 class Serializer
@@ -28,7 +32,10 @@ class Serializer
   end
 
   def self.load(s)
-    if s.nil?
+    if s.is_a?(object_class)
+      # Rails already deserialized for us
+      s
+    elsif s.nil?
       object_class.new()
     elsif s[0] == first_json_char
       SafeJSON.load(s)