X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/55aafbb07904ca24390dd47ea960eae7cb2b909a..ca6c0353c236d5fc0f829880e845cbd8489ea9ad:/services/api/lib/serializers.rb

diff --git a/services/api/lib/serializers.rb b/services/api/lib/serializers.rb
index ec6fe19972..37734e0bb4 100644
--- a/services/api/lib/serializers.rb
+++ b/services/api/lib/serializers.rb
@@ -32,7 +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)