domain and persistence

01-domain_trip.rb

class Domain::Trip
  include Virtus
  include ActiveModel::Validations
  include ActiveModel::Conversion
  extend  ActiveModel::Naming

  attribute :id
  attribute :name
  attribute :sections, Array[Section], :default => []

  def find(params)
    PersistenceTrip.(whatever criteria you need using params to get id, etc)
  end
end

02-persistence_trip.rb

class Persistence::Trip < ActiveRecord::Base
 
end

03-trips_controller.rb

def show
  @trip = Trip.find(params[:id)
end

04-index.html.haml

- @trip.sections.each do |section|
  = section.name