Add latest added tracks list on the home page

app/controllers/home_controller.rb

@@ -1,5 +1,6 @@
 class HomeController < ApplicationController
   def index
     @playlists = Playlist.all
+    @tracks = Track.latest
   end
 end

app/models/track.rb

@@ -15,4 +15,8 @@ class Track < ActiveRecord::Base
     end
     save!
   end
+
+  def self.latest
+    Track.order('created_at DESC')
+  end
 end

app/views/home/index.html.haml

@@ -2,3 +2,6 @@
 %ul
   - @playlists.each do |p|
     %li= p.name
+%ul
+  - @tracks.each do |t|
+    %li= t.name

features/home.feature

@@ -8,3 +8,12 @@ Feature: Home
     Given a playlist named "Electro"
     When I am on the home page
     Then I should see "Electro" within "ul>li"
+
+  Scenario: Last tracks added
+    Given the following tracks:
+      | name        | created_at          |
+      | Mega song 1 | 2011-07-27 19:13:42 |
+      | Mega song 2 | 2011-07-27 19:58:57 |
+    When I am on the home page
+    Then I should see "Mega song 2" within "ul>li:first-child"
+    And I should see "Mega song 1" within "ul>li:first-child+li"

features/step_definitions/tracks_step.rb

@@ -4,6 +4,12 @@ Given /^a track named "([^"]*)"$/ do |name|
   @track.save_with_file(file, 'audio/mpeg')
 end
 
+Given /^the following tracks:$/ do |table|
+  table.hashes.each do |h|
+    Factory.create(:track, h)
+  end
+end
+
 Then /^I should see an audio player$/ do
   page.should have_xpath '//audio'
 end

spec/controllers/home_controller_spec.rb

@@ -7,5 +7,12 @@ describe HomeController do
       get :index
       assigns[:playlists].should == [playlist]
     end
+
+    it 'assigns latest tracks as @tracks' do
+      track1 = Factory.create(:track, :created_at => '2011-07-27 19:13:42')
+      track2 = Factory.create(:track, :created_at => '2011-07-27 19:58:57')
+      get :index
+      assigns[:tracks].should == Track.latest
+    end
   end
 end

spec/models/track_spec.rb

@@ -56,4 +56,12 @@ describe Track do
       `rm -f #{Rails.root}/data/tracks/*`
     end
   end
+
+  describe '.latest' do
+    it 'returns latest tracks in descending creation date order' do
+      track1 = Factory.create(:track, :created_at => '2011-07-27 19:13:42')
+      track2 = Factory.create(:track, :created_at => '2011-07-27 19:58:57')
+      Track.latest.should == [track2, track1]
+    end
+  end
 end

spec/views/home/index.html.haml_spec.rb

@@ -5,6 +5,9 @@ describe 'home/index.html.haml' do
     assign :playlists, [
       mock_model('Playlist', :name => 'Electro')
     ]
+    assign :tracks, [
+      mock_model('Track', :name => 'Mega song')
+    ]
   end
 
   it 'displays a list of playlists' do
@@ -16,4 +19,9 @@ describe 'home/index.html.haml' do
     render
     rendered.should have_selector('a', :text => 'Add a track')
   end
+
+  it 'displays a list of tracks' do
+    render
+    rendered.should have_selector('ul>li', :text => 'Mega song')
+  end
 end