在第一个中,您可以覆盖用户模型中的make_token方法.该模型目前实施如下.

def make_token
  secure_digest(Time.now,(1..10).map{ rand.to_s })
end

每次用户登录时,无论是否有cookie,都会调用make_token方法,该方法为用户生成并保存新的remember_token.如果您有一些其他无法猜到的用户独有的值,则可以替换make_token方法.

def make_token
  secure_digest(self.some_secret_constant_value)
end

这将确保令牌永远不会更改,但它也可以使获得令牌的任何人模仿用户.

除此之外,如果你看一下handle_remember_cookie！在authenticated_system.rb文件中的方法,您应该能够更改此方法为您工作.

def handle_remember_cookie!(new_cookie_flag)
  return unless @current_<%= file_name %>
  case
  when valid_remember_cookie? then @current_<%= file_name %>.refresh_token # keeping same expiry date
  when new_cookie_flag        then @current_<%= file_name %>.remember_me 
  else                             @current_<%= file_name %>.forget_me
  end
  send_remember_cookie!
end

您会注意到此方法在用户模型中调用了三个方法：refresh_token,remember_me和forget_me.

def remember_me
    remember_me_for 2.weeks
  end

  def remember_me_for(time)
    remember_me_until time.from_now.utc
  end

  def remember_me_until(time)
    self.remember_token_expires_at = time
    self.remember_token            = self.class.make_token
    save(false)
  end

  # 
  # Deletes the server-side record of the authentication token.  The
  # client-side (browser cookie) and server-side (this remember_token) must
  # always be deleted together.
  #
  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  # refresh token (keeping same expires_at) if it exists
  def refresh_token
    if remember_token?
      self.remember_token = self.class.make_token 
      save(false)      
    end
  end

所有这三种方法都重置了令牌. forget_me将其设置为nil,而其他两个将其设置为make_token返回的值.您可以在用户模型中覆盖这些方法,以防止它们重置令牌(如果它已存在且未过期).这可能是最好的方法,或者你可以为handle_remember_cookie添加一些额外的逻辑！方法,虽然这可能会更多的工作.

如果我是你,我会覆盖用户模型中的remember_me_until,forget_me和refresh_token.以下应该有效.

def remember_me_until(time)
  if remember_token?
    # a token already exists and isn't expired,so don't bother resetting it
    true
  else
    self.remember_token_expires_at = time
    self.remember_token            = self.class.make_token
    save(false)
  end
end

# 
# Deletes the server-side record of the authentication token.  The
# client-side (browser cookie) and server-side (this remember_token) must
# always be deleted together.
#
def forget_me
  # another computer may be using the token,so don't throw it out
  true
end

# refresh token (keeping same expires_at) if it exists
def refresh_token
  if remember_token?
    # don't change the token,so there is nothing to save
    true     
  end
end

请注意,通过执行此操作,您将获取保护您免受令牌窃取的功能.但这是您可以做出的成本效益决定.