ActiveRecord value object

00-example.rb

class OrganisationCode
  attr_reader :prefix, :suffix
  
  def initialize(code)
    @code = code
    @prefix, @suffix = @code.split('@')
   end
   
   def to_s(format = :short)
     case format
     when :short
       @prefix
     when :long
       @code
     else
       raise ArgumentError, '...'
   end
  end
end

class Site < AR::Base
  def organisation_code
      @organisation_code ||= OrganisationCode.new(super)
    end

    def organisation_code=(new_code)
      @organisation_code = nil
      super(new_code)
    end
end

Site.create(organisation_code: 'abc@123') # => TypeError: can't quote OrganisationCode