问题描述
我想在ruby中对哈希进行深度字符串化,就像每个嵌套的哈希也必须是字符串一样
输入:
{"command": "subscribe","identifier": { "channel": "TxpoolChannel" } }
输出:
"{\"command\":\"subscribe\",\"identifier\":\"{\\\"channel\\\":\\\"TxpoolChannel\\\"}\"}"
有没有可以使用的函数或gem来实现此结果?
解决方法
require 'json'
def deep_to_json(h)
h.transform_values{|v| v.is_a?(Hash) ? deep_to_json(v) : v}.to_json
end
deep_to_json({"command": "subscribe","identifier": { "channel": "TxpoolChannel" } })
#=> "{\"command\":\"subscribe\",\"identifier\":\"{\\\"channel\\\":\\\"TxpoolChannel\\\"}\"}"
但是问题是,为什么您需要这样做?
,str = '{"co": "su","id": {"ch": "Tx"},"pig": {1: :b},"cat": { "dog": "Woof" } }'
#=> "{\"co\": \"su\",\"id\": {\"ch\": \"Tx\"},\"pig\": {1: :b},\"cat\": { \"dog\": \"Woof\" } }"
r = /
(?= # begin a positive lookahead
" # match a double-quote
[^{}]* # match 0* characters other than '{' and '}'
\} # match '}'
) # end positive lookahead
/x # invoke free-spacing regex definition mode
此正则表达式通常按如下方式编写。
r = /(?="[^{}]*\})/
它匹配双引号之前的零宽度位置,后跟左括号以外的任意数量的字符,后跟右括号,这意味着双引号位于由括号分隔的字符串中。像在问题中给出的示例一样,这假定大括号没有嵌套。
s = str.gsub(r,"\\")
#=> "{\"co\": \"su\",\"id\": {\\\"ch\\\": \\\"Tx\\\"},\"cat\": { \\\"dog\\\": \\\"Woof\\\" } }"
puts s
{"co": "su","id": {\"ch\": \"Tx\"},"cat": { \"dog\": \"Woof\" } }