unable to use json

If you are using rails 2 then i think you don't have use pure ruby version of json

http://weblog.rubyonrails.com/2007/9/30 … ew-release

Just comment this line
require 'json/pure'

and try

i'm seeing a similar problem with json. figured i'd add to this thread if anyone knows what's going on.

stuff  = Stuff.find(:all)
things = Things.find(:all)
stuff_and_things = { :stuff => stuff, :things => things }

stuff.to_json and things.to_json works fine. but stuff_and_things.to_json causes
"TypeError: wrong argument type Hash (expected Data)"

i tried  equire 'json/pure' but get
"ArgumentError: wrong number of arguments (2 for 0)"

then tried the to_json override but get
"ArgumentError: wrong number of arguments (2 for 1)"

any ideas...

The problem is that the JSON gem blows.  Doesn't work well on Windows, it's slow, incomplete, and buggy.  "gem remove json" to be sure you never use accidentally use it.  Now, if you eradicate all "require 'json'" lines from your Rails app, you'll never see this problem again.

How do you decode/encode JSON without the gem?  Call ActiveSupport::JSON.decode(string) to decode and obj.to_json to encode.

If you want to do this in a script outside of Rails, you can just copy-n-paste Rails's code.  So, to decode, paste the following to the top of your file (itself copy-n-pasted from vendor/rails/activesupport/lib/active_support/json/decoding.rb):

# copy-n-paste ActiveSupport's JSON code so this script will work anywhere
require 'yaml'
require 'strscan'

module ActiveSupport
  module JSON
    class ParseError < StandardError
    end

    class << self
      # Converts a JSON string into a Ruby object.
      def decode(json)
        YAML.load(convert_json_to_yaml(json))
      rescue ArgumentError => e
        raise ParseError, "Invalid JSON string"
      end

      protected
      # matches YAML-formatted dates
      DATE_REGEX = /^\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[ \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?)?$/

      # Ensure that ":" and "," are always followed by a space
      def convert_json_to_yaml(json) #:nodoc:
        scanner, quoting, marks, pos, times = StringScanner.new(json), false, [], nil, []
        while scanner.scan_until(/(\\['"]|['":,\\]|\\.)/)
          case char = scanner[1]
          when '"', "'"
            if !quoting
              quoting = char
              pos = scanner.pos
            elsif quoting == char
              if json[pos..scanner.pos-2] =~ DATE_REGEX
                # found a date, track the exact positions of the quotes so we can remove them later.
                # oh, and increment them for each current mark, each one is an extra padded space that bumps
                # the position in the final YAML output
                total_marks = marks.size
                times << pos+total_marks << scanner.pos+total_marks
              end
              quoting = false
            end
          when ":",","
            marks << scanner.pos - 1 unless quoting
          end
        end

        if marks.empty?
          json.gsub(/\\\//, '/')
        else
          left_pos  = [-1].push(*marks)
          right_pos = marks << json.length
          output    = []
          left_pos.each_with_index do |left, i|
            output << json[left.succ..right_pos[i]]
          end
          output = output * " "

          times.each { |i| output[i-1] = ' ' }
          output.gsub!(/\\\//, '/')
          output
        end
      end
    end
  end
end

@sabr

thz 4 suggestion. It works fine as u said !
In my case anyway, the only drawback is that many other libs need json gem to work. As an example :

# config.gem 'gnip-gnip', :lib => 'gnip', :version => '2.0.6'
# config.gem 'dj2-postrank', :lib => 'postrank', :version => '0.9.1'

Any other suggestion ?
thz in advance
luca