Monkey patch airbrake to include response from Facebook API calls, when Facebook throws a 400 or 500 (RestClient::BadRequest)

airbrake_filters.rb

# When FB throws a 400 (e.g. while calling Graph API), the real error is inside the response body.
# This initializer intends to report that to Airbrake in a way that this response doesn't get lost.
# params would include __rest_client key that contains JSON-parsed response body of the error
# Also, error message would include the actual error message from FB, instead of just a boring "400: Bad Request"

module Airbrake
  class Notifier
    def send_notice_with_extra_logging(*args)
      exception = args[0]
      params = args[1]
      if exception.is_a?(RestClient::Exception)
        params[:__rest_client] = JSON.parse(exception.response) rescue nil
      end
      send_notice_without_extra_logging(*args)
    end
    alias_method_chain :send_notice, :extra_logging
  end
end

Airbrake.add_filter do |notice|
  # Add custom key and value if specified error class
  if err = notice[:errors].find { |error| error[:type] == 'RestClient::BadRequest' || errors[:type] == 'RestClient::InternalServerError' }
    rc = notice[:params][:__rest_client]
    if rc
      rc_message = rc.try(:[], 'error').try(:[], 'message')
      if rc_message
        err[:message] += ": #{rc_message}"
      end
    end
  end
end