document.rb

# Minimal "ActiveModel-like" wrapper for CouchDB to replace ActiveRcord-based model

require 'rubygems'
require 'json'
require 'httparty'
require 'ostruct'

class Time
  def to_json(options={}); self.strftime('"%Y/%m/%d %H:%M:%S +0000"'); end
end

class Array
  alias_method :count, :size
end

module CouchDB
  
  class Document < OpenStruct

    def self.database_name=(name); @database_name = name; end
    def self.database_name; @database_name; end

    include HTTParty
    format :json

    def initialize(params={})
      super
      self.id         ||= self.title.to_s.gsub(/\s/, '-').downcase
      self.created_at   = Time.now
      self.type         = self.class.to_s.downcase
      self
    end

    def self.find_all
      response = get("/_design/#{self.to_s.downcase}/_view/by_name")
      response['rows'].map { |p| new(p['value']) }
    end
    class << self
      alias_method :all, :find_all
    end

    def self.find(id)
      new get('/'+id)
    end

    def update_attributes(params={})
      params.each_pair do |key, value|
        self.send(:"#{key}=", value) if self.respond_to?(key.to_sym)
      end
      self.save
    end

    def save
      response = self.class.put('/'+self.id, :body => self.to_json)
      if response.code.to_s == '201'
        self._rev = JSON.parse(response.body)['rev']
        self
      else
        raise Exception, response.body
      end
    end

    def destroy
      puts self.inspect
      response = self.class.delete('/'+self.id+'?rev='+self._rev)
      if response.code.to_s == '200'
        JSON.parse(response.body)['rev']
      else
        raise Exception, response.body
      end
    end

    def to_json
      @table.to_json
    end

    def to_param
      self.id.to_s || nil
    end

    def errors
      []
    end

    def new_record?
      self.id ? true : false
    end

    def id;      @table[:id];    end
    def type;    @table[:type];  end

  end

end