Drop Virtus dependency

Gemfile

@@ -11,7 +11,6 @@ gem 'sequel_pg'
 gem 'sinatra-jsonp'
 gem 'sinatra-cross_origin'
 gem 'unicorn'
-gem 'virtus'
 gem 'yajl-ruby'
 
 group :development do

Gemfile.lock

@@ -3,19 +3,9 @@ GEM
   specs:
     ansi (1.5.0)
     ast (2.2.0)
-    axiom-types (0.1.1)
-      descendants_tracker (~> 0.0.4)
-      ice_nine (~> 0.11.0)
-      thread_safe (~> 0.3, >= 0.3.1)
     coderay (1.1.1)
-    coercible (1.0.0)
-      descendants_tracker (~> 0.0.1)
-    descendants_tracker (0.0.4)
-      thread_safe (~> 0.3, >= 0.3.1)
-    equalizer (0.0.11)
     fixer (0.6.0)
       oga (~> 2.0)
-    ice_nine (0.11.2)
     kgio (2.10.0)
     method_source (0.8.2)
     minitest (5.8.4)
@@ -56,16 +46,10 @@ GEM
       multi_json (~> 1.8)
       sinatra (~> 1.0)
     slop (3.6.0)
-    thread_safe (0.3.5)
     tilt (2.0.2)
     unicorn (5.1.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)
-    virtus (1.0.5)
-      axiom-types (~> 0.1)
-      coercible (~> 1.0)
-      descendants_tracker (~> 0.0, >= 0.0.3)
-      equalizer (~> 0.0, >= 0.0.9)
     yajl-ruby (1.2.1)
 
 PLATFORMS
@@ -84,7 +68,6 @@ DEPENDENCIES
   sinatra-cross_origin
   sinatra-jsonp
   unicorn
-  virtus
   yajl-ruby
 
 BUNDLED WITH

lib/quote.rb

@@ -1,32 +1,39 @@
 # frozen_string_literal: true
 
-require 'virtus'
 require 'currency'
 
 class Quote
-  include Virtus.value_object
-
   Invalid = Class.new(StandardError)
 
-  DEFAULT_BASE = 'EUR'.freeze
+  DEFAULT_BASE = 'EUR'
 
-  values do
-    attribute :base, String, default: DEFAULT_BASE
-    attribute :date, Date, default: proc { Currency.current_date }
-    attribute :rates, Hash, default: :find_rates, lazy: true
+  attr_reader :base, :date
+
+  def initialize(params = {})
+    self.base = params[:base]
+    self.date = params[:date]
   end
 
+  def rates
+    @rates ||= find_rates
+  end
+
+  def attributes
+    { base: base, date: date, rates: rates }
+  end
+
+  alias to_h attributes
+
   private
 
   def base=(base)
-    base.upcase!
-    super base
+    @base = base ? base.upcase : DEFAULT_BASE
   end
 
   def date=(date)
-    current_date = Currency.current_date_before(date)
+    current_date = date ? Currency.current_date_before(date) : Currency.current_date
     raise Invalid, 'Date too old' unless current_date
-    super current_date
+    @date = current_date
   rescue Sequel::DatabaseError => ex
     if ex.wrapped_exception.is_a?(PG::DatetimeFieldOverflow)
       raise Invalid, 'Invalid date'