Example of a basic decorator that uses `method_missing` rather than Delegation

account_decorator.rb

class AccountDecorator

  attr_accessor :account
  def initialize(account)
    @account = account
  end
  
  def method_missing(method_name, *args, &blk)
    if account.respond_to?(method_name)
      account_method_result(method_name, *args, &blk)
    else
      super
    end
  end
  
  def respond_to_missing?(method_name)
    attributes.include?(method_name.to_s) || super
  end
  
  def attributes
    account.class.columns.map(&:name).map(&:to_s)
  end
  
  private
  
    def account_method_result(method_name, *args, &blk)
      if attributes.include?(method_name)
        result = account.public_send(method_name, *args, &blk)
        result.blank? ? '(none given)' : result
      else
        nil
      end
    end
end