Create User Model

# Schema: User(token:string, auth_token:string)
class User < ActiveRecord::Base
  has_secure_token
  has_secure_token :auth_token
end

Now when you create a new user a token and auth_token are automatically generated

user = User.new
user.save
user.token # => "pX27zsMN2ViQKta1bGfLmVJE"
user.auth_token # => "77TMHrHJFvFDwodq8w7Ev2m7"

You can update the tokens using regenerate_token and regenerate_auth_token

user.regenerate_token # => true
user.regenerate_auth_token # => true