Running method on object being serialized once #202

Expected Behavior

I am trying to find a way to run decorate on the object being serialized once instead of each time I use the object in an attribute definition. Ultimately I am looking for access to the object prior to any attribute methods being called.

Actual Behavior

Currently I have to call decorate multiple times instead of once for all attribute definitions:

attribute :full_name do |object|
  object.decorate.full_name
end

attribute :phone_numbers |object|
  object.decorate.phone_numbers
end

Steps to Reproduce the Problem

1. Define a serializer
2. Call decorate in each attribute definition block
3. Performance degrades

Specifications

• Version: 2.2.0
• Ruby version: 2.5.8