用红宝石迭代Yaml数组 [英] Iterate a yaml array with ruby

问题描述

我将 YAML.load_file 应用于示例文件：

---
languages:
  - name: "English"
    iso_639: "en"
    native_name: "English"
    region:
      - ''
      - UK
      - US
  - name: "Klingon"
    iso_639: "tlh"
    native_name: "tlhIngan Hol"
    region:
      - notearth

我想遍历这些语言和区域数组。这不起作用：

I want to iterate though these languages and the region arrays. This doesn't work:

records.each do |record|
  record.region.each do |region|
    self.create!
  end
end

record.region 给了我一个地区的未知方法错误。如何遍历语言及其地区？或者，如何访问区域数组？

record.region gives me an unknown method error for region. How can I iterate though the languages and and their regions? Or, how can I access the region array?

推荐答案

您的代码中有两个错误：

There are two errors in your code:

1. 加载YAML文件后获得的对象不是数组，而是一个哈希，例如，该文件名为 foo.yml。 ：

YAML.load_file('foo.yml')
# => {"languages"=>[{"name"=>"English", "iso_639"=>"en", ...

因此，您必须像下面那样修改代码才能使其起作用：

Thus you have to modify your code like the following to make it work:

records['languages'].each do |record|
  # ...

地区不是哈希 record 的方法，它是一个密钥，您必须使用 record ['region' ] 。

region is not a method of the hash record, it is a key, you have to access the related value using record['region'].

您必须使用的正确代码是：

The correct code you have to use is:

records['languages'].each do |record|
  record['region'].each do |region|
    # My guess is you are going to use `region` inside this block
    self.create!
  end
end

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