ruby-on-rails - 将 JSON 转换为哈希

Question

我有这个 JSON，我正在尝试将它从 Postman 发送到 Rails API:

{"object": 
 { 
    "type": "out", 
    "vars": 
    {
      "x": "x", 
      "y": "y"
    }, 
    "values": 
    {
      "ts": "timestamp", 
      "ok": 
      {
        "total": 2, 
        "min": "x", 
        "max": "y"
      }, 
      "error": 
      {
         "total": 2, 
         "error1": "first", 
         "error2": "second"
      }
    }
  }
 }

我需要在我的模型中将其转换为一个Hash，以便我可以使用before_create 对其进行操作。这是我带来的:

object = self.to_json # => converts object to json
object = JSON.parse(object) # => converts json to hash

第一个问题:我明白了(id=>nil 不相关，因为它将自动插入到数据库中):

 {"id"=>nil, "type"=>"out", "vars"=>{"x"=>"x", "y"=>"y"}, "values"=>{"ts"=>"timestamp", "ok"=>"{\"total\"=>2, \"min\"=>\"x\", \"max\"=>\"y\"}", "error"=>"{\"total\"=>2, \"error1\"=>\"first\", \"error2\"=>\"second\"}"}, "created_at"=>"2015-01-29T15:45:01.329Z", "updated_at"=>"2015-01-29T15:45:01.329Z"}

当我尝试操作 object["values"]["ok"] 时，Rails 发送错误:

unexpected token at '"{\"total\"=\u003e2, \"min\"=\u003e\"x\", \"max\"=\u003e\"y\"}"'

第二个问题:我只能调用object["values"]，我想用一个符号来调用它，而不是字符串object[:值]。

Answer 1

使用以下方法解决了我的问题:

object = self.as_json.with_indifferent_access
# => allowing me to use a symbol key instead of a string

ok_vals = object[:values][:ok].as_json.gsub(/\=\>/, ':')
# => allowing to change json string '{"val1"=>"val1", "val2"=>"val2"}' to '{"val1":"val1", "val2":"val2"}'
ok_vals = JSON.parse(ok_vals)
# => which transform json string to hash {val1: "val1", val2: "val2"}

请随时对此代码提出任何建议。感谢您的帮助。