如何解析json二级对象？

Question

下面是json响应，这里I1是主要对象，I1-1，I1-2是子对象。

{ 
 "I1": "Main Object 1", 
 "I1-1": "Sub Object 1", 
 "I1-2": "Sub Object 2", 
 "I2": "Main Object 2", 
 "I2-1": "Sub Object 1", 
 "I2-2": "Sub Object 2", 
 "I3": "Main Object 3", 
 "I3-1": "Sub Object 1", 
 "I3-2": "Sub Object 2" 
}

如何解析上面的响应来过滤红宝石中的main_objects和sub_objects？

Answer 1

require 'json'

data = JSON.parse('{
 "I1": "Main Object 1",
 "I1-1": "Sub Object 1",
 "I1-2": "Sub Object 2",
 "I2": "Main Object 2",
 "I2-1": "Sub Object 1",
 "I2-2": "Sub Object 2",
 "I3": "Main Object 3",
 "I3-1": "Sub Object 1",
 "I3-2": "Sub Object 2"
}')

main_objects = data.select { |k, _| k =~ /\AI\d+\z/ }
sub_objects  = data.select { |k, _| k =~ /\AI\d+\-\d+\z/ }

p main_objects # => {"I1"=>"Main Object 1", "I2"=>"Main Object 2", "I3"=>"Main Object 3"}
p sub_objects # => {"I1-1"=>"Sub Object 1", "I1-2"=>"Sub Object 2", "I2-1"=>"Sub Object 1", "I2-2"=>"Sub Object 2", "I3-1"=>"Sub Object 1", "I3-2"=>"Sub Object 2"}