| @@ -582,14 +582,15 @@ | ||
| 582 | 582 | register_meta( |
| 583 | 583 | 'post', |
| 584 | 584 | $key, |
| 585 | 585 | [ |
| 586 | - 'show_in_rest' => in_array( $key, $rest_keys, true ), | |
| 586 | + 'show_in_rest' => in_array( $key, $rest_keys, true ) | |
| 587 | + ? [ 'prepare_callback' => [ self::class, 'prepare_rest_meta_value' ] ] | |
| 588 | + : false, | |
| 587 | 589 | 'single' => true, |
| 588 | 590 | 'type' => 'string', |
| 589 | 591 | 'default' => '', |
| 590 | 592 | 'object_subtype' => $post_type, |
| 591 | - 'prepare_callback' => 'sanitize_text_field', | |
| 592 | 593 | 'sanitize_callback' => $sanitize_callback, |
| 593 | 594 | 'auth_callback' => static fn(): bool => current_user_can( 'edit_posts' ), |
| 594 | 595 | ] |
| 595 | 596 | ); |
| @@ -649,8 +650,20 @@ | ||
| 649 | 650 | |
| 650 | 651 | $response->set_data( $data ); |
| 651 | 652 | |
| 652 | 653 | return $response; |
| 654 | + } | |
| 655 | + | |
| 656 | + /** | |
| 657 | + * Serve legacy meta over REST as a string: scalars cast, anything else ''. | |
| 658 | + * | |
| 659 | + * Core's default serves non-strings as null, which the block editor echoes back and core | |
| 660 | + * then rejects; see doc/rest-meta-visibility.md. | |
| 661 | + * | |
| 662 | + * @param mixed $value The stored meta value. | |
| 663 | + */ | |
| 664 | + public static function prepare_rest_meta_value( $value ): string { | |
| 665 | + return is_scalar( $value ) ? (string) $value : ''; | |
| 653 | 666 | } |
| 654 | 667 | |
| 655 | 668 | /** |
| 656 | 669 | * Hide BeyondWords meta from the legacy "Custom Fields" panel. |
