Rails with Devise
before start rails devise start check
$sudo bundle install
$sudo gem update
step 1:devise install
$sudo gem install devise
step2:Edit Gemfile
$gedit Gemfile open
add and save the file
gem ‘devise’,’1.1.5′
step 3:Add devise file in your application by generator
$rails generate devise:install
step 4:Setup default url options for your specific environment
$open gedit /config/enviranments/development.rb
past config.action_mailer.default_url_options = { :host => ‘localhost:3000′ }
save the file
step 5:Ensure you have defined root_url to *something* in your config/routes.rb.
$gedit config/routes.rb
past root :to => “home#index”
save the file
step 6:Install the dependencies specified in your Gemfile
$bundle install
step 7:Generate default devise modules name
$rails generate devise User
step 8:create databse
$rake db:create
step 9:create tables and migrate with application
$rake db:migrate
step 10:
$rake routes
step 11:Start rails server
$rails server
step 12 
pen the application
http//:localhot:3000/users/sign_up
http//:localhot:3000/users/sign_out
http//:localhot:3000/users/sign_in
If u want create devise user in your application follow below .
$ rails generate devise:views
it create all devise user view files..
created login in devise…
Rocking with devise…
