easy-going-rails/lib/monkey_patches/action_dispatch/middleware/debug_exceptions.rb

require 'action_dispatch/middleware/exception_wrapper'
require 'action_dispatch/routing/inspector'
require 'action_view'

module ActionDispatch
  module Middleware
    # THIS IS A HACK TO unwrap TagWrapError when detected!
    # TagWrapError contains a 'tag' for SemanticLogger and the cause itself
    class DebugExceptions
      private

      def render_exception(request, exception, wrapper)
        ## PVINCENT's ADDITION for TagWrapError
        log_error(request, wrapper)
        if exception.is_a?(Semantic::TagWrapError)
          backtrace_cleaner = request.get_header('action_dispatch.backtrace_cleaner')
          wrapper = ExceptionWrapper.new(backtrace_cleaner, exception.error)
        end
        ## HERE it was commented off
        # log_error(request, wrapper)
        ## END OF ADDITION

        raise exception unless request.get_header('action_dispatch.show_detailed_exceptions')

        begin
          content_type = request.formats.first
        rescue ActionDispatch::Http::MimeNegotiation::InvalidType
          content_type = Mime[:text]
        end
        if api_request?(content_type)
          render_for_api_request(content_type, wrapper)
        else
          render_for_browser_request(request, wrapper)
        end
      end
    end
  end
end