Ticket #45677: 45677.diff

src/wp-includes/rest-api.php

@@ -210 +210 @@
                 }
 
                 if ( 'attachment' !== $post_type->name ) {
-                        $autosaves_controller = new WP_REST_Autosaves_Controller( $post_type->name );
+                        $autosaves_controller = new WP_REST_Autosaves_Controller( $post_type->name, $controller );
                         $autosaves_controller->register_routes();
                 }
         }

src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php

@@ -52 +52 @@
          * Constructor.
          *
          * @since 5.0.0
+     * @since 5.3.0 Added $parent_controller parameter.
          *
-         * @param string $parent_post_type Post type of the parent.
-         */
-        public function __construct( $parent_post_type ) {
+     * @param string                  $parent_post_type  Post type of the parent.
+     * @param WP_REST_Controller|null $parent_controller Controller for the Posts endpoint.
+     */
+        public function __construct( $parent_post_type, $parent_controller = null ) {
                 $this->parent_post_type = $parent_post_type;
                 $post_type_object       = get_post_type_object( $parent_post_type );
 
-                // Ensure that post type-specific controller logic is available.
-                $parent_controller_class = ! empty( $post_type_object->rest_controller_class ) ? $post_type_object->rest_controller_class : 'WP_REST_Posts_Controller';
+                if ( ! $parent_controller instanceof WP_REST_Controller ) {
+                        // Ensure that post type-specific controller logic is available.
+                        $parent_controller_class = ! empty( $post_type_object->rest_controller_class ) ? $post_type_object->rest_controller_class : 'WP_REST_Posts_Controller';
+                        $parent_controller       = new $parent_controller_class( $post_type_object->name );
+                }
 
-                $this->parent_controller    = new $parent_controller_class( $post_type_object->name );
+                $this->parent_controller    = $parent_controller;
                 $this->revisions_controller = new WP_REST_Revisions_Controller( $parent_post_type );
                 $this->rest_namespace       = 'wp/v2';
                 $this->rest_base            = 'autosaves';