Logging request params on exception

Debugging rails applications without the help of excellent tools such as airbrake can be a pain in the butt. While checking our logs we stumbled upon these kind of cryptic exceptions

 [#{timestamp}] FATAL Rails : 
TypeError (can't convert nil into String):
 # ... backtrace

We wanted to log the request parameters that led to this exception, fortunately we can invoke Rails.logger anywhere in our application and print something more useful

class ApplicationController < ActionController::Base
 around_filter :log_report

 protected

 def log_report
 yield
 rescue => e
 logger.fatal generate_report(e)
 yield 
 end

 def generate_report(exception)
 "\r
 Exception: `#{exception}`\r
 Action: `#{controller_name}##{action_name}`\r
 Request: `#{request.method} #{request.fullpath}`\r
 Referrer: `#{request.referrer}`\r
 Cookies: `#{request.cookies}`"
 end
end

#rails

#logger

#exception

#parameters