How can I send a welcome email to newly registered users in Rails using Devise?

Question

I am using Devise on Rails and I'm wondering if there is a hook or a filter that I can use to add a bit of code to Devise's user registration process and send a welcome email to the user after an account has been created. Without Devise it would be something like this...

  respond_to do |format|
      if @user.save
        Notifier.welcome_email(@user).deliver    # <======= 
  ...   

Answer 1

I solved this by using a callback method. It's not the cleanest of solutions, not as clean as an observer, but I'll take it. I'm lucky Mongoid implemented the ActiveRecord callbacks!

  after_create :send_welcome_mail
  def send_welcome_mail
     Contact.welcome_email(self.email, self.name).deliver
  end