奇怪的JSON行为? [英] Strange JSON behavior?

问题描述

我正在尝试将对象转换为JSON，然后再次对其进行解析.问题是，当我解析JSON字符串时，剩下的是散列而不是原始对象.我在 json.rubyforge.com 中找到了一个简单的示例，并尝试了它:

I'm trying to convert an object to JSON and then parse it again. The problem is, when I parse the JSON string I'm left with a Hash and not my original object. I found this simple example at json.rubyforge.com and tried it:

require 'json'

class Range
  def to_json(*a)
    {
      'json_class'   => self.class.name,
      'data'         => [ first, last, exclude_end? ]
    }.to_json(*a)
  end

  def self.json_create(o)
    new(*o['data'])
  end
end

puts JSON.parse((1..10).to_json) == (1..10)

它也失败，返回false.进一步看，似乎没有调用json_create.

It fails as well, returning false. Looking further it doesn't seem that json_create is being called.

在这一点上，我认为我必须丢失一些简单的东西，否则我会在某个地方遇到错误.我正在使用Ruby 1.9.3.有人有什么想法吗?

At this point I'm figuring I have to be missing something dead simple or I've run into a bug somewhere. I'm using Ruby 1.9.3. Anyone have any ideas?

推荐答案

p392中的这种行为变化是由于修复.有关更多信息，请参见 p392发布公告.详细信息.

This change in behavior in p392 is due to a security fix. See the p392 release announcement for more details.

您的代码在调用JSON.parse时添加了:create_additions选项:

Your code works with the addition of the :create_additions option in your call to JSON.parse:

require 'json'

class Range
  def to_json(*a)
    {
      'json_class'   => self.class.name,
      'data'         => [ first, last, exclude_end? ]
    }.to_json(*a)
  end

  def self.json_create(o)
    new(*o['data'])
  end
end

puts JSON.parse((1..10).to_json, :create_additions => true) == (1..10)

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