Update Devise to allow the login field to be username instead of email

app/models/user.rb

@@ -6,6 +6,6 @@ class User < ActiveRecord::Base
          :recoverable, :rememberable, :trackable, :validatable
 
   # Setup accessible (or protected) attributes for your model
-  attr_accessible :email, :password, :password_confirmation, :remember_me
+  attr_accessible :email, :password, :password_confirmation, :remember_me, :username
   # attr_accessible :title, :body
 end

app/views/devise/sessions/new.html.erb

@@ -1,8 +1,8 @@
 <h2>Sign in</h2>
 
 <%= form_for(resource, :as => resource_name, :url => session_path(resource_name)) do |f| %>
-  <div><%= f.label :email %><br />
-  <%= f.email_field :email, :autofocus => true %></div>
+  <div><%= f.label :username %><br />
+  <%= f.text_field :username, :autofocus => true %></div>
 
   <div><%= f.label :password %><br />
   <%= f.password_field :password %></div>

config/initializers/devise.rb

@@ -23,7 +23,7 @@ Devise.setup do |config|
   # session. If you need permissions, you should implement that in a before filter.
   # You can also supply a hash where the value is a boolean determining whether
   # or not authentication should be aborted when the value is not present.
-  # config.authentication_keys = [ :email ]
+  config.authentication_keys = [ :username ]
 
   # Configure parameters from the request object used for authentication. Each entry
   # given should be a request method and it will automatically be passed to the

db/migrate/20130413054153_add_username_to_users.rb

@@ -0,0 +1,5 @@
+class AddUsernameToUsers < ActiveRecord::Migration
+  def change
+    add_column :users, :username, :string
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20130412012722) do
+ActiveRecord::Schema.define(:version => 20130413054153) do
 
   create_table "alerts", :force => true do |t|
     t.integer  "user_id"
@@ -55,6 +55,7 @@ ActiveRecord::Schema.define(:version => 20130412012722) do
     t.string   "last_sign_in_ip"
     t.datetime "created_at",                             :null => false
     t.datetime "updated_at",                             :null => false
+    t.string   "username"
   end
 
   add_index "users", ["email"], :name => "index_users_on_email", :unique => true