Rails Rails 3, render partial 有 bug 还是代码错误?
ruby: 1.8.7 rails: 3.0.4
在 search_right.html.erb 中，render partial 时候，本机基本在 1ms 左右，但是偶尔会有一个 partial 渲染的时间 特别长，这里竟然达到了 223ms, 而且不固定会出现在那一个 item 的渲染上，是不是 rails 的 bug?
search_right.html.erb:
<% @paginated_hits.each_with_index do |hit, index| %>
<%= render :partial => "search/search_item",:locals => {:hit => hit,:index =>index} %>
<% end %>
search_item.html.erb:
<tr>
<td> "test" </td>
</tr>
查看 log 信息如下：
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.8ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.6ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.7ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.6ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.7ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.7ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (1.4ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.9ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.8ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.6ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.7ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (223.0ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.9ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.9ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (1.0ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (1.0ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (1.0ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (1.1ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (1.0ms)
16:08:52 action_view_Rendered search/_product_search_item.html.erb (0.9ms)
16:08:52 action_view_Rendered search/_product_search_right.html.erb (378.9ms)
你在循环 render ... 应该好好看看 http://guides.rubyonrails.org/layouts_and_rendering.html#using-partials .
<% @paginated_hits.each_with_index do |hit, index| %>
<%= render :partial => "search/product_search_item",:locals => {:hit => hit,:index =>index} %>
<% end %>
请教个问题：如何能把 index 也传到 partial 中去
<%= render :partial => "search/product_search_item", :collection => @paginated_hits, :as => :hit, :locals => {:hit => :hit, :index => ???? } %>
#5 楼 @michael_roshen 直接把 collection 传到你的 partial 里，然后在 partial 里循环。或者在现有实现中其他更好的方法，要 debugger 一下。
#7 楼 @leopku 简单的测试到时快乐许多，但是我们的项目上速度还是上不来，看了源代码，传 collection 他也是个循环，两种调用的都是@template.render。搞清楚了肯定分享！
#8 楼 @michael_roshen 请问你这个 :locals => {:hit => hit,:index =>index} 传递参数的形式，后面的 partial 可以使用你的 index 参数么？ https://ruby-china.org/topics/24069 请帮忙看下这个问题咯