class Acfs::Resource
  #
  # Thin wrapper around ActiveModel::Dirty
  #
  module Dirty
    extend ActiveSupport::Concern
    include ActiveModel::Dirty

    # @api private
    #
    # Resets all changes. Does not touch previous changes.
    #
    def reset_changes
      changed_attributes.clear
    end

    # @api private
    #
    # Save current changes as previous changes and reset
    # current one.
    #
    def swap_changes
      @previously_changed = changes
      reset_changes
    end

    # @api private
    #
    def save!(*)
      super.tap {|_| swap_changes }
    end

    # @api private
    #
    def loaded!
      reset_changes
      super
    end

    # @api private
    #
    def write_raw_attribute(name, value, opts = {})
      attribute_will_change! name if opts[:change].nil? || opts[:change]
      super
    end
  end
end