How To: Add :confirmable to Users

Modifying the User Model

First, add devise :confirmable to your models/user.rb file

devise :registerable, :confirmable

Create a New Migration

Then, do the migration as:

rails g migration add_confirmable_to_devise

Will generate db/migrate/YYYYMMDDxxx_add_confirmable_to_devise.rb. Add the following to it in order to do the migration.

class AddConfirmableToDevise < ActiveRecord::Migration
  # Note: You can't use change, as User.update_all will 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.all.update_all confirmed_at: DateTime.now
  end

  def down
    remove_columns :users, :confirmation_token, :confirmed_at, :confirmation_sent_at
  end
end
You can also generate the corresponding Devise views if they have not yet been created:

rails generate devise:views users
Do the migration rake db:migrate

Restart the server.

If you are not using :reconfirmable (i.e leave the commented out lines as they are in the change method described above), update the configuration in config/initializers/devise.rb

config.reconfirmable = false

SMTP Setting:

config.action_mailer.raise_delivery_errors = true
  config.action_mailer.perform_deliveries = true
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
    :address => "smtp.gmail.com",
    :port => "587",
    :domain => "localhost",
    :user_name => "zz.zz@gmail.com",
    :password => "zzzzzzzzzz",
    :authentication => "plain",
    :enable_starttls_auto => true
  }