ruby 如何将 YAML 解析为哈希/对象？
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How do I parse YAML into a hash/object?
提问by Kevin Whitaker
I have a YAML file with a few entries that look like this:
我有一个 YAML 文件，其中包含一些如下所示的条目：
001:
:title: Some title
:description: Some body text maybe
002:
:title: Some title
:description: Some body text maybe
I'm using the following Ruby method to parse that YAML file into a set of objects I can iterate over:
我正在使用以下 Ruby 方法将该 YAML 文件解析为一组我可以迭代的对象：
def parse_yaml(file)
YAML::load(File.open(File.join(settings.yaml_folder, file)))
end
def use_yaml
@items = parse_yaml('items.yml')
@items.each do |item|
x = item[1][:title]
etc...
end
end
Now, that method works, but I find it queer that I need to use item[1][:title]to access the attributes of the object I'm iterating over. How can I build my YAML file or my parsing code to allow me to use the more standard item[:title]?
现在，该方法有效，但我发现它很奇怪，我需要使用它item[1][:title]来访问我正在迭代的对象的属性。我如何构建我的 YAML 文件或我的解析代码以允许我使用更标准的item[:title]？
采纳答案by Ivan Black
It's a Hash. The parse_yamloutput is:
这是一个哈希。该parse_yaml输出是：
{ 1=>
{ :title=>"Some title",
:description=>"Some body text maybe"},
2=> { :title=>"Some title",
:description=>"Some body text maybe" }
}
You may to use the each_valuemethod like this:
您可以使用这样的each_value方法：
#...
@items = parse_yaml('items.yml')
@items.each_value do |item|
x = item[:title]
# ... etc
end
Recomend: YAML for Ruby
推荐：Ruby 的 YAML
回答by Robert Mitchell
The underlying issue is that your YAML file is storing your data as a hash, and trying to access it like an array.
潜在的问题是您的 YAML 文件将您的数据存储为散列，并尝试像数组一样访问它。
To convert your data into array format:
要将数据转换为数组格式：
---
- :title: Some title
:description: Some body text maybe
- :title: Some title
:description: Some body text maybe
Also interesting to note, the reason you had to use item[1][:title]to reference your items is that the keys 001and 002are converted to integers by YAML.load.
同样有趣的是，您必须使用item[1][:title]来引用您的项目的原因是键001和002被 YAML.load 转换为整数。
You can confirm this in irb:
您可以在 irb 中确认这一点：
irb(main):015:0> YAML.load(File.open("./test.yml"))
=> {1=>{:title=>"Some title", :description=>"Some body text maybe"}, 2=>{:title=>"Some title", :description=>"Some body text maybe"}}
回答by Frederick Cheung
Your YAML is the serialisation of a hash so you could do:
您的 YAML 是哈希的序列化，因此您可以执行以下操作：
@items.each do |key, item|
#do something with item[:title]
end
Or change your YAML to look like:
或者将您的 YAML 更改为如下所示：
- :title: blah
:description: description
- :title: second title
:description: second description
Which will result in YAML.loadreturning an array.
这将导致YAML.load返回一个数组。
