custom Devise mailer

devise_mailer.rb

class DeviseMailer < ApplicationMailer
  include Devise::Mailers::Helpers

  def confirmation_instructions(record)
    devise_mail(record, :confirmation_instructions)
  end

  def reset_password_instructions(record)
    devise_mail(record, :reset_password_instructions)
  end

  def unlock_instructions(record)
    devise_mail(record, :unlock_instructions)
  end

  # tell mailer to look for templates in devise directory
  def template_paths
    template_path = _prefixes.dup
    template_path.unshift "devise/mailer"
    template_path.unshift "#{@devise_mapping.scoped_path}/mailer" if self.class.scoped_views?
    template_path
  end
end