lib/avro/builder/field.rb in avro-builder-0.3.0 vs lib/avro/builder/field.rb in avro-builder-0.3.1

@@ -66,10 +66,12 @@
           name: name,
           type: serialized_type(reference_state),
           doc: doc,
           default: default,
           aliases: aliases
-        }.reject { |_, v| v.nil? }
+        }.reject { |_, v| v.nil? }.tap do |result|
+          result.merge!(default: nil) if optional_field
+        end
       end
 
       private
 
       # Optional fields must be serialized as a union -- an array of types.