gistfile1.rb

  def create
    old_values = GeneralEdit.new(@board.attributes.slice(*GeneralEdit.new.attribute_names))
    new_values = GeneralEdit.new(params[:general_edit])
    new_values.attributes.each { |key, value| if value == "" then new_values[key] = nil end }
    changed = new_values.attributes.diff(old_values.attributes)
    session[:edit_result_id] = nil

    if !changed.empty? then
      @edit = GeneralEdit.new(changed)
      @edit.board_id = params[:id]
      @edit.save
      render :action => "busy", :id => @edit.id
    else
      redirect_to :action => "view", :id => params[:id]
    end
  end