Example of using EDR

exampe.rb

#somewhere in a controller

CreateOrder.new(OrderRepository).create current_user, params


# where

class CreateOrder < UseCaseService
  def initialize order_repo
    @order_repo = order_repo    
  end

  def create_order user, attrs
    order = Order.new attrs[:order_attrs]
    attrs[:items].each do |item_attrs|
      order.build_item item_attrs
    end
    @order_repo.create order
  end
end

class Order
  include Edr::Model
  fields :id, :amount, :deliver_at

  attr_accessible :items
  
  def build_item attrs
    items ||= []
    items << Item.new attrs
  end
end

class OrderRepository
  class ItemRepository #this is private repo
  end

  def self.create order
    with_transaction do
      persist order
      order.items do |item|
        ItemRepository.persist item
      end
    end
  end
  
  def self.read order_id
    order = where(id: order_id).first
    order.items = ItemRepository.for_order(order_id)
    order
  end
end