lib/action_controller/metal/params_wrapper.rb in actionpack-6.0.0 vs lib/action_controller/metal/params_wrapper.rb in actionpack-6.0.1.rc1

@@ -113,10 +113,10 @@
                 self.include = m.attribute_names
               end
 
               if m.respond_to?(:nested_attributes_options) && m.nested_attributes_options.keys.any?
                 self.include += m.nested_attributes_options.keys.map do |key|
-                  key.to_s.concat("_attributes")
+                  (+key.to_s).concat("_attributes")
                 end
               end
 
               self.include
             end