Ruby on rails Rails帮助程序，concat content_标记

我试图使用一个助手在我的视图中渲染一个div，这很简单

def render_form_steps_header
    content_tag :div , class: 'col-xs-3 bs-wizard-step complete' do
        content_tag :div, class: 'text-center bs-wizard-stepnum' do
            "Step 1"
        end

        content_tag :div, class: 'progress' do
            content_tag :div, nil, class: 'progress-bar'
        end
        link_to "", "", :class => "bs-wizard-dot"
    end

结束

但似乎只是将最后一行链接_带到，如果我删除该行，它工作正常，并按预期返回div。有什么想法吗？

已经解决了：

def render_form_steps_header
content_tag :div , class: 'col-xs-3 bs-wizard-step complete' do
  str = content_tag :div, class: 'text-center bs-wizard-stepnum' do
    "Step 1"
  end
  str += content_tag :div, class: 'progress' do
    content_tag :div, nil, class: 'progress-bar'
  end

  str += link_to "", "", :class => "bs-wizard-dot"
end

---

end

传递数组也可能有效。content_标记：div{content_标记的数组}