Is it possible to convert a JSON string to an object? [duplicate]

Answer 1

if your parse this string to ruby object, it will return a ruby Hash object, you can get it like this

  ruby_obj = JSON.parse(json_string)
  ruby_obj['drawer']['stations']['tv']['header']

Answer 2

require 'json'

json_info = %q(
{
  "drawer" : {
    "stations" : {
      "tv" : {
        "header" : "TV Channels",
        "logos" : {
          "one" : "www1",
          "two" : "www2",
          "three" : "www3"
        }
      }
    }
  }
}
)

class MyJson
    def self.for(p_jason_string)
        self.new(JSON.parse(p_jason_string))
    end

    def initialize(p_info)
        @info = p_info
    end

    def inspect
        @info.inspect
    end

    def method_missing(p_missing_method_name)
        print 'mm '; p p_missing_method_name
        key = p_missing_method_name.to_s

        if @info.has_key?(key)
        then
            MyJson.new(@info[key])
        else
            puts "no key #{p_missing_method_name}"
        end
    end
end # class MyJson

holder = MyJson.for(json_info)
puts '-----holder.drawer'
p holder.drawer
puts '-----holder.drawer.stations'
p holder.drawer.stations
puts '-----holder.drawer.stations.tv.header'
p holder.drawer.stations.tv.header

Execution :

$ ruby -v
ruby 1.9.2p320 (2012-04-20 revision 35421) [x86_64-darwin12.2.0]
$ ruby -w t.rb
-----holder.drawer
mm :drawer
{"stations"=>{"tv"=>{"header"=>"TV Channels", "logos"=>{"one"=>"www1", "two"=>"www2", "three"=>"www3"}}}}
-----holder.drawer.stations
mm :drawer
mm :stations
{"tv"=>{"header"=>"TV Channels", "logos"=>{"one"=>"www1", "two"=>"www2", "three"=>"www3"}}}
-----holder.drawer.stations.tv.header
mm :drawer
mm :stations
mm :tv
mm :header
"TV Channels"

Note that I use RVM and have done nothing special to have json working, must have been automatically installed.

Answer 3

You can parse the string into a ruby hash and then turn it into a Mash. Mash provides you with method-like access.

require 'json'
require 'hashie'

hash = JSON.parse json_string
obj = Hashie::Mash.new hash
obj.drawer.stations.tv.header # => "TV Channels"

Update

You can also do it without a 3rd party gem, using ruby's own OpenStruct:

require 'ostruct'
require 'json'

obj = JSON.parse(json_string, object_class: OpenStruct)
obj.drawer.stations.tv.header # => "TV Channels"