log_subscriber

app/controllers/scores_controller.rb

@@ -5,6 +5,7 @@ class ScoresController < ApplicationController
   before_action :set_score, only: %i[show edit update destroy]
 
   def index
+    logger.info('inside controller')
     @q = Score.all.ransack(q_params)
     @pagy, @scores = pagy(@q.result)
   end

config/environments/development.rb

@@ -88,6 +88,7 @@ Rails.application.configure do # rubocop:disable Metrics/BlockLength
     end
   elsif Rails.application.server?
     config.after_initialize do
+      Semantic::LogSubscriber.new # force loading
       Semantic::DevLoader.new
     end
   end

lib/semantic/dev_loader.rb

@@ -2,7 +2,10 @@ module Semantic
   # use the Zeitwerk autoloader to reattach_appender for development autoreloading feature
   class DevLoader
     def initialize
-      Rails.autoloaders.main.on_load('ApplicationController') { append_ansi_formatter }
+      Rails.autoloaders.main.on_load('ApplicationController') do
+        append_ansi_formatter
+        append_subscriber_once
+      end
       append_ansi_formatter
     end
 
@@ -15,5 +18,13 @@ module Semantic
                                   formatter:,
                                   filter: ->(log) { !formatter.reject(log) })
     end
+
+    def append_subscriber_once
+      return unless @previous_subscribe.nil?
+
+      @previous_subscribe = ActiveSupport::Notifications.subscribe 'start_processing.action_controller' do |event|
+        Semantic::LogSubscriber.new.start_processing(event)
+      end
+    end
   end
 end

lib/semantic/log_subscriber.rb

@@ -0,0 +1,7 @@
+module Semantic
+  class LogSubscriber < ActiveSupport::LogSubscriber
+    def start_processing(event)
+      logger.warn("MyStarted #{event.payload[:controller]} - #{event.payload[:action]}", event.payload[:request])
+    end
+  end
+end