using template with ERB class

erb_layout.rb

  template = ERB.new(@template)
      template.def_method(LayoutRenderer, 'render')

      result = LayoutRenderer.new.render do
        ERB.new(@content).result(binding)
      end

      File.open('tmp/payslip_filename.html', 'w+') do |f|
        f.write result
      end