If you want to have OAuth in your Rails Application with twitter. OmniAuth is the best gem to use.
OmniAuth provides list of Strategies to use many OAuth for your application. Here is the List of Strategies.
For using Twitter OAuth you have to register a Application on Twitter (https://dev.twitter.com/apps/new)
Once you done with the registration obtain the Consumer Key and Consumer Secret from the Twitter Application.
Be sure to put the callback URL in the application. Callback URL is the URL where user will land after successful authentication.
Showing an image here how to register an Application with Twitter.
Here showing some of the steps :
Generate a new Rails Application:
rails new TwitterAuth
Update your gemfile add omniauth-twitter gem into that
Paste your key instead of XXXX, and secret instead of YYYY
Rails.application.config.middleware.use OmniAuth::Builder do provider :twitter, 'XXXX', 'YYYY' end
Just start the server
bundle exec rails server
And hit the URL
And you should be landing on the Twitter Authorize page!
After success your app will redirect to your given callback URL with information and token!
At OmniAuth.org you can try out different -2 Strategies.
Useful links :