将Ruby Hash转换为YAML [英] Convert Ruby Hash into YAML

问题描述

我需要将下面提供的哈希转换为可读的YAML。它看起来像我可以提供 YAML :: load 一个字符串，但我想我需要先将它转换为如下所示：

  hostname1.test.com：
 public：51 
 private：10 
 
 {hostname1.test.com => 
 {public=>51，private=>10}，
hostname2.test.com=> 
 {public=>192，private=>12} 
} 
  

我不确定如何有效地转换成该字符串。

我浏览了HASH文档，发现 to_yaml 没有任何内容。我通过搜索 to_yaml 找到它，当 require yaml 时变得可用。我也尝试使用Enumerable方法 collect ，但当我需要遍历值（另一个散列）时会感到困惑。

我试图使用在Ruby中将哈希转换为字符串作为参考。然后，我的想法就是将它提供给 YAML :: load ，并且这将生成我想要的YAML。

解决方案

  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 
  

以下输出：

  --- 
 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'
  

---

Object类有一个to_yaml方法。

不，它没有。

这是来自刚刚打开的IRB会话：

pre $ Object $。 b $ b => []
要求'yaml'
=> true
Object.instance_methods.grep（/ to_yaml /）
=> [：psych_to_yaml，：to_yaml，：to_yaml_properties]

I need to convert a hash like the one provided below into readable YAML. It looks like I can feed YAML::load a string, but I think I need to convert it first into something like this:

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.

I looked through the HASH documentation and couldn't find anything for to_yaml. I found it by searching for to_yaml which becomes available when you require yaml. I also tried to use the Enumerable method collect but got confused when I needed to iterate through the value (another hash).

I'm trying to use "Converting hash to string in Ruby" as a reference. My thought was then to feed that into YAML::load and that would generate the YAML I wanted.

解决方案

Here's how I'd do it:

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:

---
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.

No, it doesn't.

This is from a freshly opened IRB session:

Object.instance_methods.grep(/to_yaml/)
=> []
require 'yaml'
=> true
Object.instance_methods.grep(/to_yaml/)
=> [:psych_to_yaml, :to_yaml, :to_yaml_properties]

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