module Devise::Models::Trackable

def self.required_fields(klass)
  [:current_sign_in_at, :current_sign_in_ip, :last_sign_in_at, :last_sign_in_ip, :sign_in_count]
end

def extract_ip_from(request)
  request.remote_ip
end

def update_tracked_fields(request)
  old_current, new_current = self.current_sign_in_at, Time.now.utc
  self.last_sign_in_at     = old_current || new_current
  self.current_sign_in_at  = new_current
  old_current, new_current = self.current_sign_in_ip, extract_ip_from(request)
  self.last_sign_in_ip     = old_current || new_current
  self.current_sign_in_ip  = new_current
  self.sign_in_count ||= 0
  self.sign_in_count += 1
end

def update_tracked_fields!(request)
  # We have to check if the user is already persisted before running
  # `save` here because invalid users can be saved if we don't.
  # See https://github.com/heartcombo/devise/issues/4673 for more details.
  return if new_record?
  update_tracked_fields(request)
  save(validate: false)
end