#active_support

While building a Gem or API or any rubyish, the [active_support](http://rubygems.org/gems/activesupport) library comes in so handy. So, listing here some usages as a reminder for me (maybe for you too). 1. https://github.com/gocardless/gocardless-ruby/pull/4/files 2. [Mongoid Indifferent Access](https://github.com/mindscratch/mongoid-indifferent-access/blob/master/lib/mongoid_indifferent_access.rb) 3. [Ruby on Rails3 Tutorial Book Ref](http://books.google.com.np/books?id=8BZsP_rT5HQC&pg=PT1493&lpg=PT1493&dq=how+to+add+activesupport+hash+with+indifferent+access+in+ruby+library&source=bl&ots=kuQg_DuUQu&sig=Wk7JtlxtE_7GbQGDnN9ppmmrWsA&hl=en&sa=X&ei=phleUJDKAZG0iQfDsoGYAg&redir_esc=y#v=onepage&q&f=false) 4. http://rubydoc.info/docs/rails/Hash#except!-instance_method 5. http://guides.rubyonrails.org/active_support_core_extensions.html I'll be updating this list as I find its other use-cases or you can add on the comments and I'll update this.

ActiveSupport::Notifications is a powerful, under-utilized library which makes it easy to instrument and monitor your code. Rails exposes a tons of performance information which is easy to access and you can create your own events with a single line of code. This talk explores the basics of ActiveSupport::Notifications and gets into powerful techniques you can use to super-charge your monitoring and instrumentation.