Attempt to fix OPTIONS bug possible only in Rails 8.1.

Author: gregschmit

lib/rest_framework/utils.rb

@@ -56,6 +56,12 @@ def self.get_skipped_builtin_actions(controller_class, singular)
 
   # Get the first route pattern which matches the given request.
   def self.get_request_route(application_routes, request)
+    # Prefer the route already resolved by the router, since `recognize` may fail for non-anchored
+    # routes (e.g., OPTIONS) whose `path_info` has been modified during dispatch.
+    if route = request.env["action_dispatch.route"]
+      return route
+    end
+
     application_routes.router.recognize(request) { |route, _| return route }
   end
 

test/test/controllers/api/options_test.rb

@@ -0,0 +1,32 @@
+require "test_helper"
+
+class Api::OptionsTest < ActionDispatch::IntegrationTest
+  def test_api_options
+    options "/api"
+    assert_response(:success)
+  end
+
+  def test_plain_api_options
+    options "/api/plain"
+    assert_response(:success)
+
+    options "/api/plain", as: :json
+    assert_response(:success)
+
+    options "/api/plain", as: :xml
+    assert_response(:success)
+  end
+
+  def test_demo_api_options
+    options "/api/demo"
+    assert_response(:success)
+  end
+
+  def test_test_api_options
+    options "/api/test"
+    assert_response(:success)
+
+    options "/api/test/users"
+    assert_response(:success)
+  end
+end