From 98e6bd8cd7822689bb7f74647025d87c88937c9b Mon Sep 17 00:00:00 2001
From: Mike Dalessio <mike@37signals.com>
Date: Thu, 26 Jun 2025 15:04:03 -0400
Subject: [PATCH] Point Action Cable at the slugged cable endpoint

I proposed this upstream in https://github.com/rails/rails/pull/55250,
but it's not clear if the presence of script_name should _always_
prefix generated URLs, so for now it's local to Fizzy.
---
 app/helpers/tenanting_helper.rb         | 7 +++++++
 app/views/layouts/shared/_head.html.erb | 1 +
 2 files changed, 8 insertions(+)
 create mode 100644 app/helpers/tenanting_helper.rb

diff --git a/app/helpers/tenanting_helper.rb b/app/helpers/tenanting_helper.rb
new file mode 100644
index 000000000..762e12fa0
--- /dev/null
+++ b/app/helpers/tenanting_helper.rb
@@ -0,0 +1,7 @@
+module TenantingHelper
+  def tenanted_action_cable_meta_tag
+    tag "meta",
+        name: "action-cable-url",
+        content: [ request.script_name, ActionCable.server.config.mount_path ].join("/")
+  end
+end
diff --git a/app/views/layouts/shared/_head.html.erb b/app/views/layouts/shared/_head.html.erb
index 90f80df4e..4b342fd70 100644
--- a/app/views/layouts/shared/_head.html.erb
+++ b/app/views/layouts/shared/_head.html.erb
@@ -15,6 +15,7 @@
   <%= stylesheet_link_tag :app, "data-turbo-track": "reload" %>
   <%= javascript_importmap_tags %>
 
+  <%= tenanted_action_cable_meta_tag %>
   <%= yield :head %>
 
   <link rel="manifest" href="/manifest.json">