Contents

require 'json/ext'
require File.expand_path(File.dirname(__FILE__) + '/monkey_patches')

module JsonAttributes
  module Mixin
    def self.included(base)
      base.extend ClassMethods
    end
    
    module ClassMethods
      def json_reader(*syms)
        attr_reader *syms
        json_readers.concat(syms)
      end
      
      def json_writer(*syms)
        attr_writer *syms
        json_writers.concat(syms)
      end

      def json_accessor(*syms)
        attr_accessor *syms
        json_readers.concat(syms)
        json_writers.concat(syms)
      end

      def json_conditioner(*syms)
        json_conditioners.concat(syms)
      end

      def json_validator(*syms)
        json_validators.concat(syms)
      end

      def json_readers
        @json_readers ||= []
      end

      def json_writers
        @json_writers ||= []
      end

      def json_conditioners
        @json_conditioners ||= []
      end

      def json_validators
        @json_validators ||= []
      end
    end
    
    def report_to_json
      self.class.json_readers.inject({}) do |hash, reader|
        hash[reader] = send reader
        hash
      end.to_json
    end

    def update_from_json(json)
      parsed = JSON.parse(json).symbolize_keys!
      self.class.json_conditioners.each do |conditioner|
        parsed = send(conditioner, parsed)
      end

      self.class.json_validators.each do |validator|
        send(validator, parsed)
      end
      
      parsed.each_pair do |key, value|
        self.send("#{key}=", value) if self.class.json_writers.include?(key.to_sym)
      end
    end

    def create_from_json(json)
      parsed = JSON.parse(json)
      raise "Attempt to create without all the required json elements" unless self.class.json_writers.all? do |required|
        parsed.has_key?(required.to_s)
      end
      update_from_json(json)
    end
  end
end 

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
kissifer-json-attributes-0.0.0	lib/json-attributes.rb