## /lib/slice_host.rb
module SliceHostAPI
  def self.create_api(api_key)
    SliceHost.new(api_key)
  end

  module DNS
    class DNS
      attr_accessor :zone, :record

      def initialize(api_key)
        @zone = Zone.new(api_key),
        @record = Record.new(api_key)
      end
    end

    class Zone < ActiveResource::Base
      attr_accessor :site

      def initialize(url)
        @site = url
      end
    end

    class Record < ActiveResource::Base
      attr_accessor :site

      def initialize(url)
        @site = url
      end
    end
  end

  class SliceHost
    attr_accessor :dns

    def initialize(api_key)
      @dns = DNS::DNS.new(api_key)
    end
  end

  def self.included(klass)
    klass.send(:include, InstanceMethods)

    klass.class_eval do
      attr_accessor :slice_host
    end
  end

  module InstanceMethods
    def create_slice_host_interface(api_key)
      @slice_host = SliceHost.new(api_key)
    end
  end
end

# a model (Make)
class Make < ActiveRecord::Base
  include SliceHost
end

# console session showing how it works
>> m = Make.new
=> #<Make id: nil, name: nil, created_at: nil, updated_at: nil>
>> m.slice_host = SliceHostAPI.create_api("1234")
=> #<SliceHostAPI::SliceHost:0x102fa88b0 @dns=#<SliceHostAPI::DNS::DNS:0x102fa8860 @zone=[#<SliceHostAPI::DNS::Zone:0x102fa87e8 @site="1234">, #<SliceHostAPI::DNS::Record:0x102fa87c0 @site="1234">], @record=#<SliceHostAPI::DNS::Record:0x102fa87c0 @site="1234">>>
>> m.create_slice_host_interface("1234")
=> #<SliceHostAPI::SliceHost:0x102f78db8 @dns=#<SliceHostAPI::DNS::DNS:0x102f78d68 @zone=[#<SliceHostAPI::DNS::Zone:0x102f78c50 @site="1234">, #<SliceHostAPI::DNS::Record:0x102f78bd8 @site="1234">], @record=#<SliceHostAPI::DNS::Record:0x102f78bd8 @site="1234">>>
>> m.slice_host.dns.record
=> #<SliceHostAPI::DNS::Record:0x102f78bd8 @site="1234">
>> m.slice_host.dns.zone
=> [#<SliceHostAPI::DNS::Zone:0x102f78c50 @site="1234">, #<SliceHostAPI::DNS::Record:0x102f78bd8 @site="1234">]