module Devise::Models::Rememberable::ClassMethods

def remember_token #:nodoc:

:nodoc:
Generate a token checking if one does not already exist in the database. 
def remember_token #:nodoc:
  loop do
    token = Devise.friendly_token
    break token unless to_adapter.find_first({ remember_token: token })
  end
end

def serialize_from_cookie(*args)

Recreate the user based on the stored cookie 
def serialize_from_cookie(*args)
  id, token, generated_at = *args
  record = to_adapter.get(id)
  record if record && record.remember_me?(token, generated_at)
end

def serialize_into_cookie(record)

Create the cookie key using the record id and remember_token 
def serialize_into_cookie(record)
  [record.to_key, record.rememberable_value, Time.now.utc.to_f.to_s]
end