将 Ruby Hash 转换为 YAML
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Convert Ruby Hash into YAML
提问by Shail Patel
I need to convert a hash like the one provided below into readable YAML. It looks like I can feed YAML::loada string, but I think I need to convert it first into something like this:
我需要将下面提供的哈希转换为可读的 YAML。看起来我可以输入YAML::load一个字符串，但我想我需要先将它转换成这样的：
hostname1.test.com:
public: 51
private: 10
{"hostname1.test.com"=>
{"public"=>"51", "private"=>"10"},
"hostname2.test.com"=>
{"public"=>"192", "private"=>"12"}
}
I'm not sure exactly how to do that conversion into that string effectively though.
不过，我不确定如何有效地将该字符串转换为该字符串。
I looked through the HASH documentation and couldn't find anything for to_yaml. I found it by searching for to_yamlwhich becomes available when you require yaml. I also tried to use the Enumerable method collectbut got confused when I needed to iterate through the value (another hash).
我查看了 HASH 文档，但找不到to_yaml. 我通过搜索to_yaml当您require yaml. 我也尝试使用 Enumerable 方法，collect但是当我需要遍历值（另一个哈希）时感到困惑。
I'm trying to use "Converting hash to string in Ruby" as a reference. My thought was then to feed that into YAML::loadand that would generate the YAML I wanted.
我正在尝试使用“在 Ruby中将哈希转换为字符串”作为参考。我当时的想法是将其输入YAML::load并生成我想要的 YAML。
回答by the Tin Man
Here's how I'd do it:
这是我的做法：
require 'yaml'
HASH_OF_HASHES = {
"hostname1.test.com"=> {"public"=>"51", "private"=>"10"},
"hostname2.test.com"=> {"public"=>"192", "private"=>"12"}
}
ARRAY_OF_HASHES = [
{"hostname1.test.com"=> {"public"=>"51", "private"=>"10"}},
{"hostname2.test.com"=> {"public"=>"192", "private"=>"12"}}
]
puts HASH_OF_HASHES.to_yaml
puts
puts ARRAY_OF_HASHES.to_yaml
Which outputs:
哪些输出：
---
hostname1.test.com:
public: '51'
private: '10'
hostname2.test.com:
public: '192'
private: '12'
---
- hostname1.test.com:
public: '51'
private: '10'
- hostname2.test.com:
public: '192'
private: '12'
The Object class has a to_yaml method. I used that and it generated the YAML file correctly.
Object 类有一个 to_yaml 方法。我使用它并正确生成了 YAML 文件。
No, it doesn't.
不，它没有。
This is from a freshly opened IRB session:
这是来自新开的 IRB 会议：
Object.instance_methods.grep(/to_yaml/)
=> []
require 'yaml'
=> true
Object.instance_methods.grep(/to_yaml/)
=> [:psych_to_yaml, :to_yaml, :to_yaml_properties]
回答by Shail Patel
You can use the to_yamlmethod on a hash for this I believe after you require yaml
你可以to_yaml在散列上使用这个方法，我相信在你之后require yaml
