first release

.gitignore

@@ -0,0 +1 @@
+.*.sw?

lib/exchange_rates.rb

@@ -1,2 +1,64 @@
+require 'net/http'
+require 'uri'
+require 'hpricot'
+
 class ExchangeRates < ActiveRecord::Base
+  serialize :fields
+
+  class << self
+    def get
+      Record.new first
+    end
+
+    def update
+      row = first || new
+      updater = Updater.new
+      row.date = updater.date
+      row.fields = updater.fields
+      row.save
+    end
+  end
+
+  class Record
+    def initialize(record)
+      @record = record
+    end
+
+    def date
+      @record.date
+    end
+
+    def value(key)
+      @record.fields[key][:value]
+    end
+  end
+
+  class Updater
+    URL = 'http://www.cbr.ru/scripts/XML_daily.asp'
+    attr_reader :date, :fields
+
+    def initialize
+      @date = nil
+      @fields = {}
+      load_data
+    end
+
+    private
+
+    def load_data
+      url = URI.parse URL
+      respond = Net::HTTP.get url
+      doc = Hpricot::XML(respond)
+      parse_data(doc)
+    end
+
+    def parse_data(doc)
+      @date = Date.parse doc.at(:ValCurs)[:Date]
+      (doc/'ValCurs/Valute').each do |valute|
+        code = (valute/:CharCode).html.to_sym
+        @fields[code] = {}
+        @fields[code][:value] = (valute/:Value).html.gsub(',','.').to_f
+      end
+    end
+  end
 end