Set base currency

lib/app.rb

@@ -2,14 +2,24 @@ require_relative 'snapshot'
 require 'sinatra'
 require 'sinatra/jsonp'
 
+helpers do
+  def base
+    params[:base] || 'EUR'
+  end
+end
+
 get '/' do
   File.read File.join 'public', 'index.html'
 end
 
 get '/latest' do
-  jsonp Snapshot.last
+  jsonp Snapshot
+    .last
+    .to_base base
 end
 
-get '/:date' do
-  jsonp Snapshot.new params[:date]
+get '/:date' do |date|
+  jsonp Snapshot
+    .new(date)
+    .to_base base
 end

lib/snapshot.rb

@@ -10,10 +10,12 @@ class Snapshot
     @date = date
   end
 
-  def to_json
-    Yajl::Encoder.new.encode base: 'EUR',
+  def to_base(base)
+    {
+      base:  base,
       date:  @date,
       rates: rates
+    }
   end
 
   private

spec/snapshots_spec.rb

@@ -14,7 +14,6 @@ describe 'the application' do
   end
 
   it 'sets base currency' do
-    skip 'pending'
     get '/latest?base=USD'
     json['base'].must_equal 'USD'
   end