How To: Add :confirmable to Users

If you find yourself needing to introduce confirmable to your user model after the application has already been used for sometime, you will end up marking existing users as unconfirmed in the application.

For example, assume that you have a system full of users and you need to implement email notifications for user accounts. In doing this, existing user accounts will be left unconfirmed thus unable to login.

Here's how you can introduce confirmable to users while also marking existing users as confirmed.

First, make sure that you've created a migration to add the proper columns:

class AddConfirmableToUsers < ActiveRecord::Migration
  # Note: You can't use change, as User.update_all with fail in the down migration
  def up
    add_column :users, :confirmation_token, :string
    add_column :users, :confirmed_at, :datetime
    add_column :users, :confirmation_sent_at, :datetime
    # add_column :users, :unconfirmed_email, :string # Only if using reconfirmable
    add_index :users, :confirmation_token, :unique => true
    # User.reset_column_information # Need for some types of updates, but not for update_all.
    # To avoid a short time window between running the migration and updating all existing
    # users as confirmed, do the following
    User.update_all(:confirmed_at => Time.now)
    # All existing user accounts should be able to login after this.
  end

  def down
    remove_column :users, :confirmation_token, :confirmed_at, :confirmation_sent_at
    # remove_column :users, :unconfirmed_email # Only if using reconfirmable
  end
end

Next, add :registerable and :confirmable to the User model:

devise :registerable, :confirmable

If not using reconfirmable, update the configuration in config/intializers/devise.rb

config.reconfirmable = false