我在yaml文件中有以下数据 -
---
- :Subject_list
Subject 1:
:Act 1: A
:Act 2: B
Subject 2:
:Skill 1:
:Act 1: B
:Act 2: B
:Skill 2:
:Act 1: B
我需要从这个文件中读取数据并生成一个输出,如下所示 - 对于主题1,它将是这样的,因为它没有技能水平。意味着数组的第一个元素是null。
["","Act 1", "A"], ["","Act 2", "B"]
对于第二个主题,它将是这样的 -
["Skill 1","Act 1", "B"], ["","Act 2" "B"],["Skill 2","Act 1", "B"]
我正在使用这些值来生成一个prawn pdf表。任何帮助是极大的赞赏。
我试过这个 -
data=YAML::load(File.read("file.yaml"));
subject = data[:Subject_list]
sub_list =["Subject 1", "Subject 2"]
sub_list.each do |sub|
sub_data = []
sub_data = subject["#{sub}"]
# I convert the list symbol to an array, so i can loop through the sub activities.
#I need some direction here as how to check whether the symbol will be a skill or activity
end
干杯!!
答案 0 :(得分:14)
首先,您的yaml文件不正确YAML,您不能拥有这样的密钥,如果您有空间或奇怪的东西,您需要引用它们,以及开头的内容是什么?< / p>
"Subject_list":
"Subject 1":
"Act 1": A
"Act 2": B
"Subject 2":
"Skill 1":
"Act 1": B
"Act 2": B
"Skill 2":
"Act 1": B
然后你需要正确加载文件。您在YAML模块上调用方法load_file。 No :: for ruby afaik中的方法访问。
require 'yaml'
data = YAML.load_file "file.yaml"
subject = data["Subject_list"]
require 'pp'
subject.each do |s|
item = s.last
if item.keys.first =~ /Skill/
pp item.keys.inject([]) { |memo,x| item[x].map { |i| memo << i.flatten.unshift(x) } ; memo}
else
pp item.map { |k,v| ["", k, v] }
end
end
答案 1 :(得分:6)
在为数据构建YAML文件时,尤其是复杂的数据结构时,我让YAML为我生成它。然后我根据需要进行调整:
require 'yaml'
require 'pp'
foo = ["Skill 1","Act 1", "B"], ["","Act 2" "B"],["Skill 2","Act 1", "B"]
puts foo.to_yaml
当我运行该代码时,我得到了这个输出:
---
- - Skill 1
- Act 1
- B
- - ""
- Act 2B
- - Skill 2
- Act 1
- B
您可以通过生成YAML来证明数据是正确生成的,然后立即解析代码并显示它看起来像返回的结构,让您进行比较,并通过相等检查:
bar = YAML.load(foo.to_yaml)
pp bar
puts "foo == bar: #{ foo == bar }"
哪个会输出:
[["Skill 1", "Act 1", "B"], ["", "Act 2B"], ["Skill 2", "Act 1", "B"]]
foo == bar: true