Configure form_with_generates_remote_forms in its own initializer

This configuration is not present in ActionView::Base so we can't let
the action_view.set_configs initializer set it.

Also add tests to make sure this config works.

Fixes #28824

1 files changed, 7 insertions, 0 deletions

diff --git a/actionview/lib/action_view/railtie.rb b/actionview/lib/action_view/railtie.rb
index 0939584786..bc474f453e 100644
--- a/actionview/lib/action_view/railtie.rb
+++ b/actionview/lib/action_view/railtie.rb
@@ -17,6 +17,13 @@ module ActionView
       end
     end
 
+    initializer "action_view.form_with_generates_remote_forms" do |app|
+      ActiveSupport.on_load(:action_view) do
+        ActionView::Helpers::FormHelper.form_with_generates_remote_forms =
+          app.config.action_view.delete(:form_with_generates_remote_forms)
+      end
+    end
+
     initializer "action_view.logger" do
       ActiveSupport.on_load(:action_view) { self.logger ||= Rails.logger }
     end