rails block concat

horace_lee

于 2010-07-13 15:53:31 发布

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分类专栏： RubyOnRails 文章标签： Rails HTML

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本文介绍了一种Rails应用程序中使用助手方法将块内容渲染为部分视图的方法。通过定义`block_to_partial`助手方法，可以方便地将任意块内容转化为指定的部分视图进行渲染。这种方式特别适用于需要复用的布局元素，例如带有圆角效果的容器。

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helper method to partial

concat can be useful for rendering a block to a partial from a helper:

  def block_to_partial(partial_name, options = {}, &block)
    options.merge!(:body => capture(&block))
    concat(render(:partial => partial_name, :locals => options), block.binding)
  end

This would be particularly useful if you had some partial to help you out with rounded corners, for example. So, in your helper:

 def rounded_corners &block
   block_to_partial("shared/rounded_corners", {}, &block)
 end

In your view you could have something like:

 <% rounded_corners do -%>
      This text is surrounded by rounded corners
 <% end -%>

You would have to create some partial in

  app/views/shared/rounded_corners.html.erb

And it would look something like:

  <div class='c1'>
    <div class=c2>
      .
      .
      .
      <%= body -%>
    </div>
  </div>