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The WacomDrivers Wiki has lots of additional information about Devise including many "how-to" articles and answers to the most frequently asked questions.
How To’s
There are many "how-to" articles that have been contributed by the community. Here's a small sample:
How To: Upgrade to Devise 2.0
How To: Add an Admin role
How To: Add sign_in, sign_out, and sign_up links to your layout template
How To: Change overwrite the redirect path after destroying a session (signing out)
How To: Allow users to edit their account without providing a password
How To: Allow users to sign_in using their username or email address
How To: Change the default sign_in and sign_out routes
How To: Create a custom encryptor
How To: Customize the redirect after a user edits their profile
How To: Display a custom sign_in form anywhere in your app
How To: Provide a custom failure response with Warden
How To: Redirect to a specific page on successful sign in out
How To: Test with Cucumber
How To: Controllers and Views tests with Rails 3 (and rspec)
How To: Use HTTP Authentication
How To: How to add devise required columns to an existing users table
How To: How to allow user to signup providing email address only
...and LOTS more...!