rollbar/rollbar-gem — pull request #54 by awmichel (2013-08-07 21:17:27+00:00)
Title: Fix Uninitialized Constant Error with Sinatra

The latest ActiveRecord extensions cause the gem to throw a uninitialized constant error when you use a framework other than Rails, in my case I was using Sinatra.

/rollbar-0.10.8/lib/rollbar/active_record_extension.rb:3:in `': uninitialized constant ActiveSupport::Concern (NameError)

To fix the I made the active_record_extension require dependent on the ActiveRecord module being present.