bundle install

rails generate devise_install

rails generate devise User

rake db:migrate

rake routes

# Gemfile

gem ‘devise’, ‘1.1.rc0’

# config/environments/development.rb

config.action_mailer.default_url_options = { :host => ‘localhost:3000’ }
# models/user.rb

class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :token_authenticatable, :lockable, :timeoutable, :confirmable and :activatable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
# Setup accessible (or protected) attributes for your model
attr_accessible :email, :password, :password_confirmation
end
# migration
class DeviseCreateUsers < ActiveRecord::Migration

  def self.up

    create_table(:users) do |t|

      t.database_authenticatable :null => false
# t.confirmable
t.recoverable
t.rememberable
t.trackable
# t.lockable :lock_strategy => :failed_attempts, :unlock_strategy => :both
t.timestamps
end
add_index :users, :email,                :unique => true
# add_index :users, :confirmation_token,   :unique => true
add_index :users, :reset_password_token, :unique => true
# add_index :users, :unlock_token,         :unique => true
end
def self.down
drop_table :users
end
end
# migration

create_table(:users) do |t|

  t.database_authenticatable :null => false

  # t.confirmable
t.recoverable
t.rememberable
t.trackable
# t.lockable :lock_strategy => :failed_attempts, :unlock_strategy => :both
t.timestamps
end
add_index :users, :email,                :unique => true
# add_index :users, :confirmation_token,   :unique => true

add_index :users, :reset_password_token, :unique => true

# add_index :users, :unlock_token,         :unique => true

<!— layouts/application.html.erb —>

<div id="user_nav">

  <% if user_signed_in? %>

Signed in as <%= current_user.email %>. Not you?
<%= link_to "Sign out", destroy_user_session_path %>
<% else %>
<%= link_to "Sign up", new_user_registration_path %> or <%= link_to "sign in", new_user_session_path %>
<% end %>
</div>