padding= (ActionController::Pagination::Paginator::Window)

    # File lib/action_controller/pagination.rb, line 382
            def padding=(padding)
              @padding = padding < 0 ? 0 : padding
              # Find the beginning and end pages of the window
              @first = @paginator.has_page_number?(@page.number - @padding) ?
                @paginator[@page.number - @padding] : @paginator.first
              @last =  @paginator.has_page_number?(@page.number + @padding) ?
                @paginator[@page.number + @padding] : @paginator.last
            end