Rails 7 API 仅不从 ActionController::RoutingError 中拯救

Question

In my Rails 7 API only mode, I'm trying to catch case when someone is trying to make a request into api/v1/mandate instead of api/v1/mandates (classic ActionController::RoutingError case). In such case it will render the 404 error with some build in stuff as JSON response. I want to customize that JSON error answer inside my BaseController. I was trying:

#base_controller.rb
module Api
  module V1
    class BaseController < ActionController::API
      rescue_from ActionController::RoutingError, with: :render_not_found_error

      private

      def render_not_found_error(exception)
        render json: { error: true, message: exception.message }, status: :not_found
      end
    end
  end
end

I've also have:

#config/environments/development.rb
config.consider_all_requests_local = true

But nothing changed, still doesn't get my JSON error.

Answer 1

You can't rescue routing errors in a controller because the exceptions occur in the routing layer, not the controller.

For missing routes, you need a "catch-all" route that can capture them and then forward that to a controller which performs your "exception" handling.

In practice this often shakes out as a NotFoundController with different actions depending on the type of route being handled.