Sameer Siruguri

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How To Use The Devise Gem on Rails 3: A Tutorial

I am learning how to code on the Rails framework. I just discovered Devise today, and listened to the Railscast. The sample code that comes with the Railscast works on Rails 2, so I re-built it to work on Rails 3. You can download the code in a TAR-GZ archive.

If you don’t already have a site you want to integrate this into, then just uncompress, run ‘bundle install’, and start your server! The devise installation is already done and was used to create a model called ‘User’.

If you are trying to find the changes you have to make to enable devise, here’s what you have to do:

  1. In your Gemfile, add gem ‘devise’
  2. bundle install, of course.
  3. Copy out the configuration details from the config/environments/development.rb file (the email address that sends account-related emails, for example.)
  4. Copy the devise.rb file from config/initializers. You get this step for “free” if you use the rails g devise:install command as well.
  5. These two steps are specific to adding the model that will hold the authorization information – in this case, the name of the model is user. You can also do this by running the Rails task rails generate devise user.
    1. To your routes.rb file, add the line devise_for :users
    2. Add the user.rb file to the models folder
    3. Add the migration for the user model and run rake db:migrate

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