从 String / Ruby 中提取 Substring

Question

I get the datas from a variable called "apps".

And I have this datastructure:

{"id"=>001,
 "name"=>"test01",
 "users"=>
 [{"id"=>01,
   "name"=>"test02"},
  {"id"=>02,
   "name"=>"test03"}]}

How can I extract the namevalues from the users substring?

I have tried

apps.each do |test|
  data = Hash.new
  data['id'] = test['id']
  data['name'] = test['name']
  data['username'] = test['users.name']
  userdata = data
  userdata.each do |row|
    File.write('test.yaml', row.to_yaml)
  end
end

But that doesn't work.

desired output would be:

{"id"=>"01", "name"=>"test02","id"=>"02", "name"=>"test03"}

Answer 1

you just need to require 'yaml' in order to use it on Hash/Array classes, you don't need to iterate over array or hash, to_yaml already handles this for you.

require 'yaml'

data = {"id"=>001,
 "name"=>"test01",
 "users"=>
 [{"id"=>01,
   "name"=>"test02"},
  {"id"=>02,
   "name"=>"test03"}]}

File.write('test.yml', data["users"].to_yaml)