You can now login using either username or email

app/models/user.rb

@@ -6,6 +6,22 @@ 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 :username, :email, :password, :password_confirmation,
+    :remember_me, :login
   # attr_accessible :title, :body
+
+  # Virtual attribute for authenticating by either username or email
+  # This is in addition to a real persisted field like 'username'
+  attr_accessor :login
+
+  # allow login via either username or email address
+  def self.find_first_by_auth_conditions(warden_conditions)
+    conditions = warden_conditions.dup
+    if login = conditions.delete(:login)
+      where(conditions).where(["lower(username) = :value OR lower(email) = :value", { :value => login.downcase }]).first
+    else
+      where(conditions).first
+    end
+  end
+
 end

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

@@ -3,8 +3,8 @@
 <%= form_for(resource, :as => resource_name, :url => password_path(resource_name), :html => { :method => :post }) do |f| %>
   <%= devise_error_messages! %>
 
-  <div><%= f.label :email %><br />
-  <%= f.email_field :email %></div>
+  <div><%= f.label :login %><br />
+  <%= f.text_field :login %></div>
 
   <div><%= f.submit "Send me reset password instructions" %></div>
 <% end %>

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

@@ -3,6 +3,9 @@
 <%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
   <%= devise_error_messages! %>
 
+  <div><%= f.label :username %><br />
+  <%= f.text_field :username %></div>
+
   <div><%= f.label :email %><br />
   <%= f.email_field :email %></div>
 

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 %></div>
+  <div><%= f.label :login %><br />
+  <%= f.text_field :login %></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 = [ :login ]
 
   # 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
@@ -99,7 +99,7 @@ Devise.setup do |config|
   config.reconfirmable = true
 
   # Defines which key will be used when confirming an account
-  # config.confirmation_keys = [ :email ]
+  config.confirmation_keys = [ :login ]
 
   # ==> Configuration for :rememberable
   # The time the user will be remembered without asking for credentials again.
@@ -155,7 +155,7 @@ Devise.setup do |config|
   # ==> Configuration for :recoverable
   #
   # Defines which key will be used when recovering the password for an account
-  # config.reset_password_keys = [ :email ]
+  config.reset_password_keys = [ :login ]
 
   # Time interval you can reset your password with a reset password key.
   # Don't put a too small interval or your users won't have the time to
@@ -229,4 +229,4 @@ Devise.setup do |config|
   # When using omniauth, Devise cannot automatically set Omniauth path,
   # so you need to do it manually. For the users scope, it would be:
   # config.omniauth_path_prefix = "/my_engine/users/auth"
-end
+end

config/locales/devise.en.yml

@@ -1,6 +1,11 @@
 # Additional translations at https://github.com/plataformatec/devise/wiki/I18n
 
 en:
+  activerecord:
+    attributes:
+      user:
+        login: "Username or email"
+
   errors:
     messages:
       expired: "has expired, please request a new one"

db/migrate/20120903112806_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 => 20120903092956) do
+ActiveRecord::Schema.define(:version => 20120903112806) do
 
   create_table "users", :force => true do |t|
     t.string   "email",                  :default => "", :null => false
@@ -26,6 +26,7 @@ ActiveRecord::Schema.define(:version => 20120903092956) 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