archive/app/models/archive_sort_order.rb

class ArchiveSortOrder
  include Mongoid::Document
  field :sort_order, :type => Boolean   # true => asc , false => desc
  field :need_update_sort, :type => Boolean, :default => true
  field :min_sort_number, :type => Integer, :default => 0
  field :max_sort_number, :type => Integer, :default => 0
  after_initialize do |record|
	if(!record.new_record? && record.sort_order.nil?)
		record.sort_order = true
		record.save
	elsif(!record.new_record?)
		@module_app = ModuleApp.where(:key=>'archive').first
		if !@module_app.nil?
			@asc = @module_app.asc rescue nil
			if !@asc.nil?
				record.sort_order = @asc
				record.save
			end
		end
	end
  end
  after_save do |record|
	  unless record.instance_variable_get(:@skip_callback)
	  	if record.sort_order_changed?
				@module_app = ModuleApp.where(:key=>'archive').first
				if !@module_app.nil?
					@sort_order = record.sort_order rescue nil
					if !@asc.nil?
						if !@module_app.attributes[:asc].nil?
							@module_app.asc = @sort_order
							@module_app.save
						end
					end
				end
				record.instance_variable_set(:@skip_callback, true)
				record.update(:need_update_sort=>true)
				if record.need_update_sort
					Thread.new do
						sort_order = record.sort_order ? 1 : -1
						ArchiveFile.recalc_sort_number(sort_order)
						record.instance_variable_set(:@skip_callback, false)
					end
				end
			end
		end
  end
  def get_default_order
  	self.sort_order ? self.min_sort_number : self.max_sort_number
  end
end