module Devise::Models::TokenAuthenticatable::ClassMethods

def authenticate_with_token(attributes)

Authenticate a user based on authentication token. 
def authenticate_with_token(attributes)
  token = attributes[self.token_authentication_key]
  resource = self.find_for_token_authentication(token)
  resource if resource.try(:valid_authentication_token?, token)
end

def authentication_token 

def authentication_token
  ::Devise.friendly_token
end

def find_for_token_authentication(token)


end
self.find_by_authentication_token(token, :conditions => conditions)
conditions = {:active => true}
def self.find_for_token_authentication(token, conditions = {})

== Example:

namedscope to filter records while authenticating.
Overwrite to add customized conditions, create a join, or maybe use a
Find first record based on conditions given (ie by the sign in form). 
def find_for_token_authentication(token)
  self.find(:first, :conditions => { :authentication_token => token})
end