From b65700a88f6663ea798a11e2fa35046573684fc6 Mon Sep 17 00:00:00 2001
From: Christian Sutter <git@doublesignal.com>
Date: Thu, 23 Jan 2025 12:17:50 +0000
Subject: [PATCH] Create `Current` model as attributes singleton

This uses `ActiveSupport::CurrentAttributes` to track the current user
across the request.
---
 app/controllers/concerns/authentication.rb      | 11 +++++++++--
 app/controllers/recommended_links_controller.rb |  2 +-
 app/helpers/application_helper.rb               |  4 ++--
 app/models/current.rb                           |  3 +++
 4 files changed, 15 insertions(+), 5 deletions(-)
 create mode 100644 app/models/current.rb

diff --git a/app/controllers/concerns/authentication.rb b/app/controllers/concerns/authentication.rb
index 584ce457..33f533a7 100644
--- a/app/controllers/concerns/authentication.rb
+++ b/app/controllers/concerns/authentication.rb
@@ -1,10 +1,17 @@
-# Requires a user to be logged in through GDS SSO for any action.
+# Requires a user to be logged in through GDS SSO for any action, and keeps track of the current
+# user through `Current`.
 module Authentication
   extend ActiveSupport::Concern
 
   included do
     include GDS::SSO::ControllerMethods
 
-    before_action :authenticate_user!
+    before_action :authenticate_user!, :set_current
+  end
+
+private
+
+  def set_current
+    Current.user = current_user
   end
 end
diff --git a/app/controllers/recommended_links_controller.rb b/app/controllers/recommended_links_controller.rb
index 4ccccb99..e479244e 100644
--- a/app/controllers/recommended_links_controller.rb
+++ b/app/controllers/recommended_links_controller.rb
@@ -59,6 +59,6 @@ def set_recommended_link
   def recommended_link_params
     params
       .expect(recommended_link: %i[link title description keywords comment])
-      .merge(user_id: current_user.id)
+      .merge(user_id: Current.user.id)
   end
 end
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 7bbeb06f..a9b9137c 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1,6 +1,6 @@
 module ApplicationHelper
   def navigation_items
-    return [] unless current_user
+    return [] unless Current.user
 
     [
       {
@@ -9,7 +9,7 @@ def navigation_items
         active: controller.controller_name == "recommended_links",
       },
       {
-        text: current_user.name,
+        text: Current.user.name,
         href: Plek.new.external_url_for("signon"),
       },
       {
diff --git a/app/models/current.rb b/app/models/current.rb
new file mode 100644
index 00000000..73a9744b
--- /dev/null
+++ b/app/models/current.rb
@@ -0,0 +1,3 @@
+class Current < ActiveSupport::CurrentAttributes
+  attribute :user
+end