Spree/Solidus Module Decorator pattern

spree_decorator.rb

require 'active_support/concern'

module MyNamespace::SpreeDecorator
  extend ActiveSupport::Concern
  
  included do
    # Call base class methods here!
    some_class_method :foo
    some_class_method_with_block do 
      another_class_method :bar
    end  
  end
  
  def overridden_method
    # Overrides method
  end
  
  def overridden_method_calling_original_one
    super # this is available using this decorator approach
    # New code
  end
  
  def totally_new_method
    # Just a plain old method
  end
end

Spree::ClassToBeDecorated.include MyNamespace::SpreeDecorator