Add track/{new,create} with file upload for the track

app/controllers/tracks_controller.rb

@@ -3,6 +3,22 @@ class TracksController < ApplicationController
     @track = Track.find params[:id]
   end
 
+  def new
+    @track = Track.new
+  end
+
+  def create
+    @track = Track.new(:name => params[:track][:name])
+    if params[:track][:file]
+      @track.uploaded_file = params[:track][:file]
+    end
+    if @track.save
+      redirect_to @track
+    else
+      render :new
+    end
+  end
+
   def stream
   end
 end

app/models/track.rb

@@ -1,3 +1,17 @@
 class Track < ActiveRecord::Base
   validates_presence_of :name
+
+  after_create :save_file
+
+  def uploaded_file=(file)
+    @file = file
+  end
+
+  def save_file
+    if @file
+      File.open("#{Rails.root}/data/tracks/#{id}", 'w') do |f|
+        f.write @file.tempfile.read
+      end
+    end
+  end
 end

app/views/playlists/index.html.haml

@@ -1,4 +1,5 @@
 = link_to 'Create playlist', new_playlist_path
+= link_to 'Add a track', new_track_path
 %ul
   - @playlists.each do |p|
     %li

app/views/tracks/new.html.haml

@@ -0,0 +1,6 @@
+= form_for @track, :html => { :multipart => true } do |t|
+  = t.label :name
+  = t.text_field :name
+  = t.label :file
+  = t.file_field :file
+  = t.submit 'Upload'

features/tracks.feature

@@ -9,6 +9,14 @@ Feature: Tracks
     When I go to the track page for "Mega song"
     Then I should see "Mega song" within "h1"
 
+  Scenario: Create track
+    Given I am on the playlists page
+    When I follow "Add a track"
+    And I fill in "Name" with "Mega song"
+    And I attach the file "features/data/test.mp3" to "File"
+    And I press "Upload"
+    Then I should see "Mega song" within "h1"
+
   Scenario: Listen track
     Given a track named "Mega song"
     When I go to the track page for "Mega song"

spec/controllers/tracks_controller_spec.rb

@@ -14,4 +14,58 @@ describe TracksController do
       assigns[:track].should == track
     end
   end
+
+  describe 'GET new' do
+    it 'assigns a new track as @track' do
+      get :new
+      assigns[:track].should be_a_new(Track)
+    end
+  end
+
+  describe 'POST create' do
+    let(:track) { mock_model(Track).as_null_object }
+    before { Track.stub(:new).and_return(track) }
+
+    it 'creates a new track' do
+      Track.should_receive(:new).
+        with(:name => 'Mega song').
+        and_return(track)
+      post :create, :track => valid_attributes
+    end
+
+    it 'saves the track' do
+      track.should_receive(:save)
+      post :create, :track => {}
+    end
+
+    it 'saves the file uploaded for the track' do
+      file = mock(Rack::Test::UploadedFile)
+      track.should_receive(:uploaded_file=).with(file)
+      post :create, :track => { :file => file }
+    end
+
+    context 'when the track saves successfully' do
+      it 'redirects to the track page' do
+        post :create, :track => valid_attributes
+        response.should redirect_to(track)
+      end
+    end
+
+    context 'when the track fails to save' do
+      before do
+        track.stub(:save).and_return(false)
+      end
+
+      it 'assigns the track as @track' do
+        post :create, :track => {}
+        assigns[:track].should == track
+      end
+
+      it 'renders the new template' do
+        post :create, :track => {}
+        response.should render_template('new')
+      end
+    end
+
+  end
 end

spec/models/track_spec.rb

@@ -15,4 +15,24 @@ describe Track do
 
     it { should_not be_valid }
   end
+
+  describe '#uploaded_file=' do
+    let(:track) { Track.new :name => 'Mega song' }
+
+    it 'saves an uploaded file' do
+      filepath = "#{Rails.root}/spec/fixtures/test.mp3"
+      file = mock(Rack::Test::UploadedFile)
+      file.stub(
+        :tempfile     => File.new(filepath),
+        :content_type => 'audio/mpeg'
+      )
+      track.uploaded_file = file
+      track.save
+      File.read("#{Rails.root}/data/tracks/#{track.id.to_s}").should == File.read(filepath)
+    end
+
+    after do
+      `rm -rf #{Rails.root}/data/tracks/*`
+    end
+  end
 end

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

@@ -21,4 +21,9 @@ describe 'playlists/index.html.haml' do
     render
     rendered.should have_selector('a', :text => 'Electro')
   end
+
+  it 'displays a link to create a new track' do
+    render
+    rendered.should have_selector('a', :text => 'Add a track')
+  end
 end

spec/views/tracks/new.html.haml_spec.rb

@@ -0,0 +1,35 @@
+require 'spec_helper'
+
+describe 'tracks/new.html.haml' do
+  let(:track) do
+    mock_model('Track').as_new_record.as_null_object
+  end
+
+  before do
+    assign :track, track
+  end
+
+  it 'renders a form to create a track' do
+    render
+    rendered.should have_selector("form[method=post][action='#{tracks_path}']")
+    rendered.should have_selector('input[type=submit]')
+  end
+
+  it 'renders a text field with a label for the playlists name' do
+    track.stub(:name => 'Mega song')
+    render
+    rendered.should \
+      have_selector("input[type=text][name='track[name]'][value='Mega song']")
+    rendered.should \
+      have_selector('label[for=track_name]', :text => 'Name')
+  end
+
+  it 'renders a file field with a label for the tracks file' do
+    render
+    rendered.should have_selector("form[enctype='multipart/form-data']")
+    rendered.should \
+      have_selector("input[type=file][name='track[file]']")
+    rendered.should \
+      have_selector('label[for=track_file]', :text => 'File')
+  end
+end