如何删除YAML文件顶部的'---'？ [英] How to remove '---' on top of a YAML file?

问题描述

我正在修改Ruby中的YAML文件。在我写回修改的YAML之后，我看到在文件顶部添加了一个 --- 。这是如何得到补充，如何摆脱它？

YAML使用三条破折号（---）将指令与文档内容分开。如果没有指令存在，这也用于指示文档的开始。

示例：

 ＃ 1998年本垒打排名
 --- 
  -  Mark McGwire 
  -  Sammy Sosa 
  -  Ken Griffey 
 
＃球队排名
  -  -  
  -  Chicago Cubs 
  -  St Louis红雀
  

所以如果你有多个文件每个YAML文件，你必须用三个破折号分隔它们。如果你只有一个文档，你可以删除/省略它（如果缺少三个破折号，我从来没有在Ruby中使用YAML的问题）。当你将对象放大时，它被添加的原因是，我猜测，翻转器是按规格书写的，并不在乎实现这样的快捷方式（当它只有一个文档时，省略三个破折号） p>

I am modifying a YAML file in Ruby. After I write back the modified YAML, I see a --- added on top of the file. How is this getting added and how do I get rid of it?

解决方案

YAML spec says:

YAML uses three dashes ("---") to separate directives from document content. This also serves to signal the start of a document if no directives are present.

Example:

# Ranking of 1998 home runs
---
- Mark McGwire
- Sammy Sosa
- Ken Griffey

# Team ranking
---
- Chicago Cubs
- St Louis Cardinals

So if you have multiple documents per YAML file, you have to separate them by three dashes. If you only have one document, you can remove/omit it (I never had a problem with YAML in ruby if three-dashes was missing). The reason why it's added when you yamlify your object is that, I guess, the dumper is written "by the spec" and doesn't care to implement such "shortcuts" (omit three-dashes when it's only one document).

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