lib/recurly/resource.rb in recurly-2.18.12 vs lib/recurly/resource.rb in recurly-2.18.13

@@ -822,12 +822,12 @@
         value = respond_to?(key) ? send(key) : self[key]
         node = builder.add_element key
 
         # Duck-typing here is problematic because of ActiveSupport's #to_xml.
         case value
-        when Resource, Subscription::AddOns
+        when Resource
           value.to_xml options.merge(:builder => node)
-        when Array
+        when Array, Subscription::AddOns
           value.each do |e|
             if e.is_a? Recurly::Resource
               # create a node to hold this resource
               e_node = node.add_element Helper.singularize(key)
               # serialize the resource into this node