Heroku newrelic_rpm：未定义的方法`保存之前'；对于#<；类别：0x00000004a28b28>；

自从我在Heroku应用程序上将newrelic_rpm gem从3.5.8.72更新到3.6.1.88后，我注意到newrelic正在我的rake任务中加载，给了我奇怪的错误：

rake aborted!
undefined method `before_save' for #<Class:0x00000003d2f908>
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/dynamic_matchers.rb:55:in `method_missing'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/session_store.rb:90:in `<class:Session>'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/session_store.rb:79:in `<class:SessionStore>'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/session_store.rb:53:in `<module:ActiveRecord>'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/session_store.rb:3:in `<top (required)>'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application/configuration.rb:138:in `session_store'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application.rb:273:in `block in default_middleware_stack'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application.rb:237:in `tap'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application.rb:237:in `default_middleware_stack'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/engine.rb:469:in `app'
...

rake中止！
未定义的“保存前”方法#
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active\u record/dynamic\u matchers.rb:55:in'method\u missing'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active\u record/session\u store.rb:90:in`'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active\u record/session\u store.rb:79:in`'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active\u record/session\u store.rb:53:in`'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active\u record/session\u store.rb:3:in`'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application/configuration.rb:138:在“会话商店”中
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application.rb:273:in`block in default\u middleware\u stack'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application.rb:237:in'tap'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/application.rb:237:in'default\u middleware\u stack'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.13/lib/rails/engine.rb:469:in'app'
...

我知道问题肯定来自newrelic_rpm，所以我想知道如何在rake任务中禁用它

我尝试设置一个ENV变量，但它也会为webapp禁用newrelic。有没有一种方法可以为我所有的rake任务设置ENV var，但只能在rake上设置，而不能在web服务器上设置

---

非常感谢

最佳解决方案取决于您如何运行rake任务。例如，如果您是从cronjob运行此命令，那么您可以将

NEWRELIC\u ENABLE=false

预先添加到rake任务的cron条目中

否则，如果手动运行rake任务，则应将以下内容添加到newrelic.yml文件中

autostart.blacklist_可执行文件：rake

---

这将防止代理在可执行文件名为rake的任何实例中启动。请注意，如果您有其他可执行文件希望阻止New Relic在其中启动，则此列表也可以是逗号分隔的列表。

非常感谢。我正在使用cronjobs，我希望避免在每个条目中添加NEWRELIC_ENABLE=false（将来可能会很棘手）。因此，文件newrelic.yml的行是完美的！