WP_REST_Meta_Fields::update_value( array $meta, int $object_id ): null|WP_Error

142	public function update_value( $meta, $object_id ) {143		$fields = $this->get_registered_fields();144		$error  = new WP_Error();145 146		foreach ( $fields as $meta_key => $args ) {147			$name = $args['name'];148			if ( ! array_key_exists( $name, $meta ) ) {149				continue;150			}151 152			$value = $meta[ $name ];153 154			/*155			 * A null value means reset the field, which is essentially deleting it156			 * from the database and then relying on the default value.157			 *158			 * Non-single meta can also be removed by passing an empty array.159			 */160			if ( is_null( $value ) || ( array() === $value && ! $args['single'] ) ) {161				$args = $this->get_registered_fields()[ $meta_key ];162 163				if ( $args['single'] ) {164					$current = get_metadata( $this->get_meta_type(), $object_id, $meta_key, true );165 166					if ( is_wp_error( rest_validate_value_from_schema( $current, $args['schema'] ) ) ) {167						$error->add(168							'rest_invalid_stored_value',169							/* translators: %s: Custom field key. */170							sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ),171							array( 'status' => 500 )172						);173						continue;174					}175				}176 177				$result = $this->delete_meta_value( $object_id, $meta_key, $name );178				if ( is_wp_error( $result ) ) {179					$error->merge_from( $result );180				}181				continue;182			}183 184			if ( ! $args['single'] && is_array( $value ) && count( array_filter( $value, 'is_null' ) ) ) {185				$error->add(186					'rest_invalid_stored_value',187					/* translators: %s: Custom field key. */188					sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ),189					array( 'status' => 500 )190				);191				continue;192			}193 194			$is_valid = rest_validate_value_from_schema( $value, $args['schema'], 'meta.' . $name );195			if ( is_wp_error( $is_valid ) ) {196				$is_valid->add_data( array( 'status' => 400 ) );197				$error->merge_from( $is_valid );198				continue;199			}200 201			$value = rest_sanitize_value_from_schema( $value, $args['schema'] );202 203			if ( $args['single'] ) {204				$result = $this->update_meta_value( $object_id, $meta_key, $name, $value );205			} else {206				$result = $this->update_multi_meta_value( $object_id, $meta_key, $name, $value );207			}208 209			if ( is_wp_error( $result ) ) {210				$error->merge_from( $result );211				continue;212			}213		}214 215		if ( $error->has_errors() ) {216			return $error;217		}218 219		return null;220	}