Ruby on rails 未定义的方法'；改变'；for：更新时间戳值时的Fixnum

我在一个项目中使用Google的OAuth2 API，使用Omniauth轻松创建初始帐户，但是为了使用这些API，我需要刷新access_令牌，因为它们仅在一小时内有效，但在刷新令牌时更新expires_at值时遇到了一个问题

以下是我用于请求令牌刷新的代码：

require 'oauth2'
class Identity < ActiveRecord::Base
belongs_to :user
  def refresh_access_token
    case self.provider
      when "google"
        client = OAuth2::Client.new OAUTH_KEYS_CONFIG['google']['client_id'], 
                                    OAUTH_KEYS_CONFIG['google']['client_secret'],
                                    {
                                      :site => 'https://accounts.google.com',
                                      :authorize_url => "/o/oauth2/auth",
                                      :token_url => "/o/oauth2/token"
                                    }
        response = OAuth2::AccessToken.from_hash(client, :refresh_token => self.refresh_token).refresh!

        self.update_attribute(:access_token, response.token)
        self.update_attribute(:expires_at, Time.at(response.expires_at))
    end
  end
end

堆栈跟踪

activerecord (3.2.11) lib/active_record/attribute_methods/time_zone_conversion.rb:69:in `round_usec'
activerecord (3.2.11) lib/active_record/attribute_methods/time_zone_conversion.rb:46:in `expires_at='
activerecord (3.2.11) lib/active_record/persistence.rb:180:in `update_attribute'
app/models/identity.rb:69:in `refresh_access_token'
app/controllers/sessions_controller.rb:30:in `create'
actionpack (3.2.11) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.11) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.11) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.11) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.11) lib/active_support/callbacks.rb:414:in `_run__3108124736639590412__process_action__2258996443485139522__callbacks'
activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.11) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.11) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.11) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.11) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.11) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.11) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.11) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.11) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.11) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.11) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.11) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.11) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:601:in `call'
omniauth (1.1.1) lib/omniauth/strategy.rb:394:in `call_app!'
omniauth (1.1.1) lib/omniauth/strategy.rb:356:in `callback_phase'
omniauth-oauth2 (1.1.1) lib/omniauth/strategies/oauth2.rb:77:in `callback_phase'
omniauth (1.1.1) lib/omniauth/strategy.rb:219:in `callback_call'
omniauth (1.1.1) lib/omniauth/strategy.rb:175:in `call!'
omniauth (1.1.1) lib/omniauth/strategy.rb:157:in `call'
omniauth (1.1.1) lib/omniauth/builder.rb:48:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.4) lib/rack/etag.rb:23:in `call'
rack (1.4.4) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.4) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.4) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.11) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.11) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `_run__2408988688759615157__call__236505231918019627__callbacks'
activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.11) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.11) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.11) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.11) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.11) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.4) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.4) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.11) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.4) lib/rack/lock.rb:15:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.11) lib/rails/engine.rb:479:in `call'
railties (3.2.11) lib/rails/application.rb:223:in `call'
rack (1.4.4) lib/rack/content_length.rb:14:in `call'
railties (3.2.11) lib/rails/rack/log_tailer.rb:17:in `call'
thin (1.5.0) lib/thin/connection.rb:81:in `block in pre_process'
thin (1.5.0) lib/thin/connection.rb:79:in `catch'
thin (1.5.0) lib/thin/connection.rb:79:in `pre_process'
thin (1.5.0) lib/thin/connection.rb:54:in `process'
thin (1.5.0) lib/thin/connection.rb:39:in `receive_data'
eventmachine (1.0.0) lib/eventmachine.rb:187:in `run_machine'
eventmachine (1.0.0) lib/eventmachine.rb:187:in `run'
thin (1.5.0) lib/thin/backends/base.rb:63:in `start'
thin (1.5.0) lib/thin/server.rb:159:in `start'
rack (1.4.4) lib/rack/handler/thin.rb:13:in `run'
rack (1.4.4) lib/rack/server.rb:268:in `start'
railties (3.2.11) lib/rails/commands/server.rb:70:in `start'
railties (3.2.11) lib/rails/commands.rb:55:in `block in <top (required)>'
railties (3.2.11) lib/rails/commands.rb:50:in `tap'
railties (3.2.11) lib/rails/commands.rb:50:in `<top (required)>'
script/rails:6:in `require'
script/rails:6:in `<main>'

activerecord（3.2.11）lib/active\u record/attribute\u methods/time\u zone\u conversion.rb:69:in'round\u usec'
activerecord（3.2.11）lib/active\u record/attribute\u methods/timer\u zone\u conversion.rb:46:in`expires\u at='10
activerecord（3.2.11）lib/active\u record/persistence.rb:180:in'update\u属性'
app/models/identity.rb:69:in'refresh\u access\u token'
app/controllers/sessions_controller.rb:30:in'create'
actionpack（3.2.11）lib/action\u controller/metal/implicit\u render.rb:4:in'send\u action'
actionpack（3.2.11）lib/abstract\u controller/base.rb:167:in'process\u action'
actionpack（3.2.11）lib/action\u controller/metal/rendering.rb:10:in'process\u action'
actionpack（3.2.11）lib/abstract\u controller/callbacks.rb:18:in‘block in process\u action’
activesupport（3.2.11）lib/active\u support/callbacks.rb:414:in``运行\uuuu31081247366395950412\uuuu进程\uu操作\uuu225896443485139522\uu回调'
activesupport（3.2.11）lib/active\u support/callbacks.rb:405:in`\uu run\u callback'
activesupport（3.2.11）lib/active\u support/callbacks.rb:385:in``运行\进程\操作\回调'
activesupport（3.2.11）lib/active\u support/callbacks.rb:81:in'run\u callbacks'
actionpack（3.2.11）lib/abstract\u controller/callbacks.rb:17:in'process\u action'
actionpack（3.2.11）lib/action\u controller/metal/rescue.rb:29:in'process\u action'
actionpack（3.2.11）lib/action\u controller/metal/instrumentation.rb:30:in‘block in process\u action’中
activesupport（3.2.11）lib/active_support/notifications.rb:123:in'block in instrument'
activesupport（3.2.11）lib/active_support/notifications/instrumenter.rb:20:in'instrument'
activesupport（3.2.11）lib/active_support/notifications.rb:123:in'instrument'
actionpack（3.2.11）lib/action\u controller/metal/instrumentation.rb:29:in'process\u action'
actionpack（3.2.11）lib/action_controller/metal/params_wrapper.rb:207:在“进程_操作”中
activerecord（3.2.11）lib/active_record/railties/controller_runtime.rb:18:in'process_action'
actionpack（3.2.11）lib/abstract_controller/base.rb:121:正在进行中
actionpack（3.2.11）lib/abstract_controller/rendering.rb:45:in'process'
actionpack（3.2.11）lib/action_controller/metal.rb:203:in'dispatch'
actionpack（3.2.11）lib/action\u controller/metal/rack\u delegation.rb:14:in'dispatch'
actionpack（3.2.11）lib/action_controller/metal.rb:246:in“block in action”
actionpack（3.2.11）lib/action\u dispatch/routing/route\u set.rb:73:in'call'
actionpack（3.2.11）lib/action_dispatch/routing/route_set.rb:73:in'dispatch'
actionpack（3.2.11）lib/action\u dispatch/routing/route\u set.rb:36:in'call'
旅程（1.0.4）lib/travely/router.rb:68:in“呼叫阻塞”
旅程（1.0.4）lib/travely/router.rb:56:in'each'
旅程（1.0.4）lib/travely/router.rb:56:in'call'
actionpack（3.2.11）lib/action_dispatch/routing/route_set.rb:601:in'call'
omniauth（1.1.1）lib/omniauth/strategy.rb:394:in'call_app！'
omniauth（1.1.1）lib/omniauth/strategy.rb:356:in'callback_phase'
omniauth-oauth2（1.1.1）lib/omniauth/strategies/oauth2.rb:77:处于“回调”阶段
omniauth（1.1.1）lib/omniauth/strategy.rb:219:in'callback\u call'
omniauth（1.1.1）lib/omniauth/strategy.rb:175:in'call！'
omniauth（1.1.1）lib/omniauth/strategy.rb:157:in'call'
omniauth（1.1.1）lib/omniauth/builder.rb:48:in'call'
actionpack（3.2.11）lib/action\u dispatch/middleware/best\u standards\u support.rb:17:in'call'
机架（1.4.4）lib/rack/etag.rb:23:in'call'
rack（1.4.4）lib/rack/conditionalget.rb:25:in'call'
actionpack（3.2.11）lib/action\u dispatch/middleware/head.rb:14:in'call'
actionpack（3.2.11）lib/action_dispatch/middleware/params_parser.rb:21:in'call'
actionpack（3.2.11）lib/action\u dispatch/middleware/flash.rb:242:in'call'
机架（1.4.4）lib/rack/session/abstract/id.rb:210:在“上下文”中
机架（1.4.4）lib/rack/session/abstract/id.rb:205:in'call'
actionpack（3.2.11）lib/action\u dispatch/middleware/cookies.rb:341:in'call'
activerecord（3.2.11）lib/active\u record/query\u cache.rb:64:in'call'
activerecord（3.2.11）lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:479:in'call'
actionpack（3.2.11）lib/action_dispatch/middleware/callbacks.rb:28:in'block in call'
activesupport（3.2.11）lib/active\u support/callbacks.rb:405:in``运行\uuuu 2408988688759615157\uuuu调用\uuuu 236505231918019627\uu回调'
activesupport（3.2.11）lib/active\u support/callbacks.rb:405:in`\uu run\u callback'
activesupport（3.2.11）lib/active\u-support/callbacks.rb:385:in``运行\调用\回调'
activesupport（3.2.11）lib/active\u support/callbacks.rb:81:in'run\u callbacks'
actionpack（3.2.11）lib/action_dispatch/middleware/callbacks.rb:27:in'call'
actionpack（3.2.11）lib/action_dispatch/middleware/reloader.rb:65:in'call'
actionpack（3.2.11）lib/action_dispatch/middleware/remote_ip.rb:31:in'call'
actionpack（3.2.11）lib/action\u dispatch/middleware/debug\u exceptions.rb:16:in'call'
actionpack（3.2.11）lib/action\u dispatch/middleware/show\u exceptions.rb:56:in'call'
railties（3.2.11）lib/rails/rack/logger.rb:32:in'call_app'
railties（3.2.11）lib/rails/rack/logger.rb:16:in'block in call'
activesupport（3.2.11）lib/active\u support/taged\u logging.rb:22:in'taged'
railties（3.2.11）lib/rails/rack/logger.rb:16:in'call'
actionpack（3.2.11）lib/action\u dispatch/middleware/request\u id.rb:22:in'call'
rack（1.4.4）lib/rack/methodoverride.rb:21:in'call'
rack（1.4.4）lib/rack/runtime.rb:17:in'call'
activesupport（3.2.11）lib/active\u support/cache/strategy/local\u cache.rb:72:in'call'
机架（1.4.4）lib/rack/lock.rb:15:in'call'
actionpack（3.2.11）lib/action\u dispatch/middleware/static.rb:62:in'call'
railties（3.2.11）lib/rails/engine.rb:479:in'call'
铁路（3.2.11）lib/铁路
activerecord (3.2.11) lib/active_record/attribute_methods/time_zone_conversion.rb:69:in `round_usec'
activerecord (3.2.11) lib/active_record/attribute_methods/time_zone_conversion.rb:46:in `expires_at='
activerecord (3.2.11) lib/active_record/persistence.rb:180:in `update_attribute'
app/models/identity.rb:69:in `refresh_access_token'
app/controllers/sessions_controller.rb:30:in `create'
actionpack (3.2.11) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.11) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.11) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.11) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.11) lib/active_support/callbacks.rb:414:in `_run__3108124736639590412__process_action__2258996443485139522__callbacks'
activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.11) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.11) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.11) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.11) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.11) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.11) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.11) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.11) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.11) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.11) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.11) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.11) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.11) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.11) lib/action_dispatch/routing/route_set.rb:601:in `call'
omniauth (1.1.1) lib/omniauth/strategy.rb:394:in `call_app!'
omniauth (1.1.1) lib/omniauth/strategy.rb:356:in `callback_phase'
omniauth-oauth2 (1.1.1) lib/omniauth/strategies/oauth2.rb:77:in `callback_phase'
omniauth (1.1.1) lib/omniauth/strategy.rb:219:in `callback_call'
omniauth (1.1.1) lib/omniauth/strategy.rb:175:in `call!'
omniauth (1.1.1) lib/omniauth/strategy.rb:157:in `call'
omniauth (1.1.1) lib/omniauth/builder.rb:48:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.4) lib/rack/etag.rb:23:in `call'
rack (1.4.4) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.4) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.4) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.11) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.11) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `_run__2408988688759615157__call__236505231918019627__callbacks'
activesupport (3.2.11) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.11) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.11) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.11) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.11) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.11) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.11) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.11) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.4) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.4) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.11) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.4) lib/rack/lock.rb:15:in `call'
actionpack (3.2.11) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.11) lib/rails/engine.rb:479:in `call'
railties (3.2.11) lib/rails/application.rb:223:in `call'
rack (1.4.4) lib/rack/content_length.rb:14:in `call'
railties (3.2.11) lib/rails/rack/log_tailer.rb:17:in `call'
thin (1.5.0) lib/thin/connection.rb:81:in `block in pre_process'
thin (1.5.0) lib/thin/connection.rb:79:in `catch'
thin (1.5.0) lib/thin/connection.rb:79:in `pre_process'
thin (1.5.0) lib/thin/connection.rb:54:in `process'
thin (1.5.0) lib/thin/connection.rb:39:in `receive_data'
eventmachine (1.0.0) lib/eventmachine.rb:187:in `run_machine'
eventmachine (1.0.0) lib/eventmachine.rb:187:in `run'
thin (1.5.0) lib/thin/backends/base.rb:63:in `start'
thin (1.5.0) lib/thin/server.rb:159:in `start'
rack (1.4.4) lib/rack/handler/thin.rb:13:in `run'
rack (1.4.4) lib/rack/server.rb:268:in `start'
railties (3.2.11) lib/rails/commands/server.rb:70:in `start'
railties (3.2.11) lib/rails/commands.rb:55:in `block in <top (required)>'
railties (3.2.11) lib/rails/commands.rb:50:in `tap'
railties (3.2.11) lib/rails/commands.rb:50:in `<top (required)>'
script/rails:6:in `require'
script/rails:6:in `<main>'

class Identity < ActiveRecord::Base
  self.skip_time_zone_conversion_for_attributes = [:expires_at]
end