如何在HAML中执行if/else，而无需重复缩进代码 [英] How to do an if/else in HAML without repeating indented code

问题描述

根据用户是否登录，我想打印另一种％body-tag.

Depending on if a user is signed in or not, I'd like to print a different kind of %body-tag.

这是我目前的操作方式:

This is how I currently do it:

- if defined? @user
  %body(data-account="#{@user.account}")
    %h1 Welcome
    -# all my content
- else
  %body
    %h1 Welcome
    -# all my content

如您所见，其中有很多重复的代码.我该如何消除呢?我已经尝试过以下方法:

As you can see there's a lot of duplicated code in there. How can I eliminate this? I already tried the following:

- if defined? @user
  %body(data-account="#{@user.account}")
- else
  %body
  %h1 Welcome
  -# all my content

不幸的是，这是行不通的，因为HAML会将其解释为％h1，而其内容是else语句的一部分，而它们当然不是.

Unfortunately, this doesn't work since HAML interprets it as if the %h1 and the content is part of the else-statement, which of course they aren't.

关于如何解决此问题的任何想法?我一直都在遇到这个问题，所以我无法想象没有一个简单的解决方案.

Any ideas on how to solve this? I run in this problem all the time, so I can't imagine there isn't a simple solution for it.

推荐答案

!!!
 - @user = "jed" #=> stubbing out an instance
%html
  %head
    - string = defined?(@user) ? "#{@user}" : nil #=> for demo only, wrap this in a helper method
    %title{'data-account' => string}
  %body
    =yield

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