feat: customized page 404

app/controllers/application_controller.rb

@@ -419,6 +419,17 @@ class ApplicationController < ActionController::Base
     prepend_view_path "app/custom_views"
   end
 
+  def try_nav_bar_profile_from_referrer
+    # detect context from referer, simple (no detection when refreshing the page)
+    params = Rails.application.routes.recognize_path(request&.referer)
+
+    controller_class = "#{params[:controller].camelize}Controller".safe_constantize
+    return if controller_class.nil?
+
+    controller_instance = controller_class.new
+    controller_instance.try(:nav_bar_profile)
+  end
+
   # Extract a value from params based on the "path"
   #
   # params: { dossiers: { champs_public_attributes: { 1234 => { value: "hello" } } } }

app/controllers/errors_controller.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class ErrorsController < ApplicationController
+  def nav_bar_profile = try_nav_bar_profile_from_referrer
+
+  def not_found
+    render(status: 404)
+  end
+end

app/controllers/release_notes_controller.rb

@@ -21,16 +21,7 @@ class ReleaseNotesController < ApplicationController
     render "scrollable_list" if params[:page].present?
   end
 
-  def nav_bar_profile
-    # detect context from referer, simple (no detection when refreshing the page)
-    params = Rails.application.routes.recognize_path(request&.referer)
-
-    controller_class = "#{params[:controller].camelize}Controller".safe_constantize
-    return if controller_class.nil?
-
-    controller_instance = controller_class.new
-    controller_instance.try(:nav_bar_profile)
-  end
+  def nav_bar_profile = try_nav_bar_profile_from_referrer
 
   private