# @DEPRECATED
# module Models
#   module Extensions
#     module Page
#       module Parts
#
#         extend ActiveSupport::Concern
#
#         included do
#           embeds_many :parts, :class_name => 'PagePart'
#
#           before_validation do |p|
#             if p.parts.empty?
#               p.parts << PagePart.build_body_part(p.respond_to?(:body) ? p.body : nil)
#             end
#           end
#         end
#
#         module InstanceMethods
#
#           def parts_attributes=(attributes)
#             self.update_parts(attributes.values.map { |attrs| PagePart.new(attrs) })
#           end
#
#           def joined_parts
#             self.parts.enabled.map(&:template).join('')
#           end
#
#           protected
#
#           def update_parts(parts)
#             performed = []
#
#             # add / update
#             parts.each do |part|
#               if (existing = self.parts.detect { |p| p.id == part.id || p.slug == part.slug })
#                 existing.attributes = part.attributes.delete_if { |k, v| %w{_id slug}.include?(k) }
#               else
#                 self.parts << (existing = part)
#               end
#               performed << existing unless existing.disabled?
#             end
#
#             # disable missing parts
#             (self.parts.map(&:slug) - performed.map(&:slug)).each do |slug|
#               self.parts.detect { |p| p.slug == slug }.disabled = true
#             end
#           end
#
#           def update_parts!(new_parts)
#             self.update_parts(new_parts)
#             self.save
#           end
#
#         end
#       end
#     end
#   end
# end