Simple and Stupid Ruby API for Coderwall.com

coderwall.rb

# Simple and Stupid Ruby API for Coderwall.com
# Vivien Didelot <vivien@didelot.org>

require "open-uri"
require "json"

module CoderWall
  class Achievement
    attr_reader :name, :badge, :description

    def initialize(hashed_badge)
      @name, @badge, @description = hashed_badge.values
    end
  end

  module_function

  def achievements_of(username)
    raise(ArgumentError, "Invalid username") if username.empty?
    url = URI.escape("http://coderwall.com/#{username}.json")
    begin
      response = JSON.load(open(url))
    rescue OpenURI::HTTPError
      raise(ArgumentError, "Invalid username")
    end

    response["badges"].map { |badge| Achievement.new(badge) }
  end
end

sample.rb

#!/bin/env ruby

require "coderwall"

begin
  achievements = CoderWall.achievements_of("v0n")

  puts achievements.class # => Array
  puts achievements.count # => 5
  puts achievements.first.class # => CoderWall::Achievement
  puts achievements.first.name # => Walrus
  puts achievements.first.badge # => http://coderwall.com/images/badges/walrus.png
  puts achievements.first.description # => "The walrus is no stranger to variety..."

  CoderWall.achievements_of("slkfjsldkfj") # => fail: Invalid username
rescue => e
  puts "fail: " + e.message
end

exit

Thanks for this simple code!
Since Coderwall changed the order of the parameters in the JSON API, you need to modify the Achievement class to this:

attr_reader :name, :badge, :description, :date

def initialize(hashed_badge)
  @name, @description, @date, @badge = hashed_badge.values
end

I forked and did this here: https://gist.github.com/4053443

... or just use the provided hash as a hash, since the order isn't guaranteed per JSON spec.