我该怎么写“文字"?一次并同时检查path_info是否包含"A"? [英] How can I do to write "Text" just once and in the same time check if the path_info includes 'A'?

问题描述

- if !request.path_info.include? 'A'
  %{:id => 'A'}
   "Text"
- else
  "Text"

文本"被写入两次.我该怎么做只写一次，同时检查path_info是否包含"A"?

"Text" is written twice. How can I do to write it just once and in the same time check if the path_info includes 'A'?

推荐答案

有两种方法可以做到这一点.使用部分，或使用 content_for块:

There are two ways to do this. Using a partial, or using a content_for block:

如果文本"较长或是重要的子树，则可以将其提取为部分文本.这会使您的代码变干一点.在给出的示例中，这似乎有些矫kill过正.

If "Text" was longer, or was a significant subtree, you could extract it into a partial. This would DRY up your code a little. In the example given this would seem like overkill.

在这种情况下，更好的方法是使用content_for块，如下所示:

The better way in this case would be to use a content_for block, like so:

- if !request.path_info.include? 'A'
  %{:id => 'A'}
    =yield :content
- else
  =yield :content

-content_for :content do
  Text

在这里，我们在两个地方都产生了content_for块，从而消除了重复文本"的需要.在这种情况下，我会说这是您最好的解决方案.

Here we yield to the content_for block in both places, removing the need to duplicate "Text". I would say in this case this is your best solution.

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