# What are Cacher & GarbageCollector for? **URL:** \ **Category:** Rails\ **Created:** [April 30, 2007, 8:47pm UTC](https://www.ruby-forum.com/t/what-are-cacher-garbagecollector-for/103015 "2007-04-30T20:47:22Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![jmay](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e8c25b/32.png) [@jmay](https://www.ruby-forum.com/u/jmay)\ **Post date:** [April 30, 2007, 8:47pm UTC](https://www.ruby-forum.com/t/what-are-cacher-garbagecollector-for/103015/1 "2007-04-30T20:47:22Z")
In the default environment.rb that is created with a new Rails app, the following line is commented out: # config.active\_record.observers = :cacher, :garbage\_collector What are these two observers for? I can’t find documentation for these anywhere. Thanks, -Jason ---
**Author:** ![jmay](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e8c25b/32.png) [@jmay](https://www.ruby-forum.com/u/jmay)\ **Post date:** [May 1, 2007, 1:53am UTC](https://www.ruby-forum.com/t/what-are-cacher-garbagecollector-for/103015/2 "2007-05-01T01:53:10Z")
On 4/30/07, jmay [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > In the default environment.rb that is created with a new Rails app, > the following line is commented out: > > # config.active\_record.observers = :cacher, :garbage\_collector > > What are these two observers for? I can’t find documentation for > these anywhere. Those aren’t real. That line is used as an example. If anything, they’re real observers for someone’s app. I mean, if you were going to make them up, why not use something like: # config.active\_record.observers = :flux\_capacitor – Rick O. [http://lighthouseapp.com](http://lighthouseapp.com) [http://weblog.techno-weenie.net](http://weblog.techno-weenie.net) [http://mephistoblog.com](http://mephistoblog.com)