Adding album resource

It is very similar to creating photo model. Each album has a title and has many photos.

$ rails generate model album title:string
    invoke  active_record
    create    db/migrate/20131004132907_create_albums.rb
    create    app/models/album.rb
    invoke    test_unit
    create      test/unit/album_test.rb
    create      test/fixtures/albums.yml

And we can do the association at the same time.

$ rails generate migration AddAlbumIdToPhoto album_id:integer
    invoke  active_record
    create    db/migrate/20131004133355_add_album_id_to_photo.rb

Then we can migrate two migrations at once.

$ rake db:migrate
==  CreateAlbums: migrating =========================================
-- create_table(:albums)
   -> 0.0024s
==  CreateAlbums: migrated (0.0027s) ================================

==  AddAlbumIdToPhoto: migrating ====================================
-- add_column(:photos, :album_id, :integer)
   -> 0.0021s
==  AddAlbumIdToPhoto: migrated (0.0024s) ===========================

Generating controller

$ rails generate controller albums
    create  app/controllers/albums_controller.rb
    invoke  erb
    create    app/views/albums
    invoke  test_unit
    create    test/functional/albums_controller_test.rb
    invoke  helper
    create    app/helpers/albums_helper.rb
    invoke    test_unit
    create      test/unit/helpers/albums_helper_test.rb
    invoke  assets
    invoke    coffee
    create      app/assets/javascripts/albums.js.coffee
    invoke    scss
    create      app/assets/stylesheets/albums.css.scss

The controller

 class AlbumsController < ApplicationController
   def new
     @album = Album.new
   end
 
   def create
     @album = Album.new params[:album]
     if @album.save
       redirect_to @album
    else
      render :new
    end
  end
end

The views/albums/new.html.erb file.

 <h1>New Album</h1>
 
 <%= form_for @album do |f| %>
   <p>
     <%= f.label :title %> <br>
     <%= f.text_field :title %>
   </p>
 
   <p>
    <%= f.submit 'Create Album' %>
  </p>
<% end %>

What’s next? We’re going to take a look at “Associate photo to album”.