Cover Rails 8.1

.github/workflows/ci.yml

@@ -15,11 +15,14 @@ jobs:
       fail-fast: false
       matrix:
         ruby: ['3.2', '3.3', '3.4']
-        rails: ['7.1.0', '7.2.0', '8.0.0']
+        rails: ['7.1.0', '7.2.0', '8.0.0', '8.1.0']
         activeadmin: ['3.2.0', '3.5.0']
         exclude:
+          # Active Admin 3.2 predates Rails 8 support.
           - rails: '8.0.0'
             activeadmin: '3.2.0'
+          - rails: '8.1.0'
+            activeadmin: '3.2.0'
     env:
       RAILS: ${{ matrix.rails }}
       AA: ${{ matrix.activeadmin }}

tasks/test.rake

@@ -2,7 +2,14 @@ desc 'Creates a test rails app for the specs to run against'
 task :setup do
   require 'rails/version'
 
+  # Rails 8.1 wires importmap-rails into the generated ApplicationController
+  # (stale_when_importmap_changes). This app runs on Sprockets, so that gem is
+  # absent and the controller raises NameError at boot, before any example.
+  # Skipping JavaScript stops the macro being generated; the Active Admin
+  # bundle the specs exercise comes from active_admin:install, not from
+  # rails new, so nothing the suite needs goes with it.
   rails_new_args = %w[
+    --skip-javascript
     --skip-turbolinks
     --skip-spring
     --skip-bootsnap