Ticket #45677: 45677.12.diff

src/wp-includes/class-wp-post-type.php

@@ -343 +343 @@
          * @since 5.3.0
          * @var WP_REST_Controller $rest_controller
          */
-        private $rest_controller;
+        public $rest_controller;
 
         /**
          * Constructor.
@@ -722 +722 @@
                         $this->rest_controller = new $class( $this->name );
                 }
 
+                if ( ! ( $this->rest_controller instanceof $class ) ) {
+                        return null;
+                }
+
                 return $this->rest_controller;
         }
 }

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

@@ -15 +15 @@
  * @see WP_REST_Controller
  */
 class WP_REST_Posts_Controller extends WP_REST_Controller {
-
-        /**
-         * Instances of post type controllers keyed by post type.
-         *
-         * @since 5.3.0
-         * @var WP_REST_Controller[]
-         */
-        private static $post_type_controllers = array();
-
         /**
          * Post type.
          *

tests/phpunit/tests/rest-api/rest-posts-controller.php

@@ -4616 +4616 @@
                 );
         }
 
+        /**
+         * @ticket 45677
+         */
+        public function test_get_for_post_type_returns_null_for_invalid_provided_controller() {
+                register_post_type(
+                        'test',
+                        array(
+                                'show_in_rest'    => true,
+                                'rest_controller' => new \stdClass(),
+                        )
+                );
+
+                $this->assertNull( get_post_type_object( 'test' )->get_rest_controller() );
+        }
+
+        /**
+         * @ticket 45677
+         */
+        public function test_get_for_post_type_returns_null_for_controller_class_mismatch() {
+                register_post_type(
+                        'test',
+                        array(
+                                'show_in_rest'          => true,
+                                'rest_controller_class' => WP_REST_Posts_Controller::class,
+                                'rest_controller'       => new WP_REST_Terms_Controller( 'category' ),
+                        )
+                );
+
+                $this->assertNull( get_post_type_object( 'test' )->get_rest_controller() );
+        }
+
         public function tearDown() {
                 _unregister_post_type( 'private-post' );
                 _unregister_post_type( 'youseeme' );