Update default scaffold templates to set 303 (See Other) as status code on redirect for the update action

XHR requests other than GET or POST have issues when using 302
(e.g browsers trying to follow the redirect using the
original request method resulting in double PATCH/PUT)

This should be reverted when / if
https://github.com/rails/rails/pull/45393 is merged

railties/CHANGELOG.md

@@ -1,3 +1,10 @@
+*   Update default scaffold templates to set 303 (See Other) as status code
+    on redirect for the update action for XHR requests other than GET or POST
+    to avoid issues (e.g browsers trying to follow the redirect using the
+    original request method resulting in double PATCH/PUT)
+
+    *Guillermo Iguaran*
+
 *   The new `config.autoload_lib_once` is similar to `config.autoload_lib`,
     except that it adds `lib` to `config.autoload_once_paths` instead.
 

railties/lib/rails/generators/rails/scaffold_controller/templates/controller.rb.tt

@@ -34,7 +34,7 @@ class <%= controller_class_name %>Controller < ApplicationController
   # PATCH/PUT <%= route_url %>/1
   def update
     if @<%= orm_instance.update("#{singular_table_name}_params") %>
-      redirect_to <%= redirect_resource_name %>, notice: <%= %("#{human_name} was successfully updated.") %>
+      redirect_to <%= redirect_resource_name %>, notice: <%= %("#{human_name} was successfully updated.") %>, status: :see_other
     else
       render :edit, status: :unprocessable_entity
     end

railties/test/generators/scaffold_controller_generator_test.rb

@@ -41,6 +41,7 @@ def test_controller_skeleton_is_created
 
       assert_instance_method :update, content do |m|
         assert_match(/@user\.update\(user_params\)/, m)
+        assert_match(/status: :see_other/, m)
       end
 
       assert_instance_method :destroy, content do |m|