Mild refactoring of an example from "Rails Does Not Define Your Application Architecture" | http://www.naildrivin5.com/blog/2014/05/27/rails-does-not-define-your-application-architecture.html

01_person.rb

class Person < ActiveRecord::Base
end

02_full_name.rb

class FullName < Struct.new(:surname, :given_name)
  extend Sliceable

  def to_s
    "#{surname} #{given_name}"
  end
end

03_sliceable.rb

module Sliceable
  def for(record)
    self.new(*record.slice(members))
  end
end

04_show.html.erb

<%= FullName.for(@person) %>