Make writable_attributes public

lib/api/contracts/model_contract.rb

@@ -48,6 +48,10 @@ module API
         end
       end
 
+      def writable_attributes
+        collect_ancestor_attributes(:writable_attributes)
+      end
+
       validate :readonly_attributes_unchanged
       validate :run_attribute_validations
 
@@ -63,10 +67,6 @@ module API
         attribute_validations.each { |validation| instance_exec(&validation) }
       end
 
-      def writable_attributes
-        collect_ancestor_attributes(:writable_attributes)
-      end
-
       def attribute_validations
         collect_ancestor_attributes(:attribute_validations)
       end