X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/2ab1b540a710fd454f33e9ba22db601e67f3d217..441ef97e93a951b349356df96d8a6ef604c6cab7:/services/api/lib/serializers.rb

diff --git a/services/api/lib/serializers.rb b/services/api/lib/serializers.rb
index 41379f308f..e412f63f62 100644
--- a/services/api/lib/serializers.rb
+++ b/services/api/lib/serializers.rb
@@ -1,7 +1,13 @@
 require 'safe_json'
 
 class Serializer
+  class TypeMismatch < ArgumentError
+  end
+
   def self.dump(val)
+    if !val.is_a?(object_class)
+      raise TypeMismatch.new("cannot serialize #{val.class} as #{object_class}")
+    end
     SafeJSON.dump(val)
   end