Index: src/wp-includes/meta.php IDEA additional info: Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP <+>UTF-8 =================================================================== --- src/wp-includes/meta.php (revision 3d31284c5e658f1fd31b5758b4a18a27778001cb) +++ src/wp-includes/meta.php (date 1589305922314) @@ -205,7 +205,7 @@ // Compare existing value to new value if no prev value given and the key exists only once. if ( empty( $prev_value ) ) { - $old_value = get_metadata( $meta_type, $object_id, $meta_key ); + $old_value = get_metadata( $meta_type, $object_id, $meta_key, false, true ); if ( count( $old_value ) == 1 ) { if ( $old_value[0] === $meta_value ) { return false; @@ -476,6 +476,7 @@ * Retrieves metadata for the specified object. * * @since 2.9.0 + * @since 5.5.0 Added the `$unfiltered` parameter. * * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', * or any other object type with an associated meta table. @@ -484,9 +485,10 @@ * the specified object. Default empty. * @param bool $single Optional. If true, return only the first value of the specified meta_key. * This parameter has no effect if meta_key is not specified. Default false. + * @param bool $unfiltered Optional. Whether to apply filters. Default false. * @return mixed Single metadata value, or array of values */ -function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false ) { +function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false, $unfiltered = false ) { if ( ! $meta_type || ! is_numeric( $object_id ) ) { return false; } @@ -543,13 +545,60 @@ } } - if ( $single ) { - return ''; - } else { - return array(); - } -} + if ( $unfiltered ) { + if ( $single ) { + return ''; + } else { + return array(); + } + } + return get_metadata_default( $meta_type, $meta_key, $single, $object_id ); +} + +/** + * Retrieve metadata data default for the specified object. + * + * @since 5.5.0 + * + * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). + * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for + * the specified object. + * @param bool $single Optional, default is false. + * If true, return only the first value of the specified meta_key. + * This parameter has no effect if meta_key is not specified. + * @param int $object_id Optional, default is 0. + * ID of the object metadata is for + * @return mixed Single metadata value, or array of values + */ +function get_metadata_default( $meta_type, $meta_key, $single = false, $object_id = 0 ) { + if ( $single ) { + $value = ''; + } else { + $value = array(); + } + + /** + * Filter the default value a specified object. + * + * @since 5.5.0 + * + * @param array|string $value The value should return - a single metadata value, + * or an array of values. + * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). + * @param string $meta_key Meta key. + * @param bool $single Whether to return only the first value of the specified $meta_key. + * @param int $object_id Object ID. + */ + $value = apply_filters( "default_{$meta_type}_metadata", $value, $meta_type, $meta_key, $single, $object_id ); + + if ( ! $single && ! wp_is_numeric_array( $value ) ) { + $value = array( $value ); + } + + return $value; +} + /** * Determines if a meta key is set for a given object. * @@ -1139,6 +1188,7 @@ * @type string $type The type of data associated with this meta key. * Valid values are 'string', 'boolean', 'integer', 'number', 'array', and 'object'. * @type string $description A description of the data attached to this meta key. + * @type mixed $default Default value when calling `get_metadata()`. * @type bool $single Whether the meta key has one value per object, or an array of values per object. * @type string $sanitize_callback A function or method to call when sanitizing `$meta_key` data. * @type string $auth_callback Optional. A function or method to call when performing edit_post_meta, @@ -1165,6 +1215,7 @@ 'object_subtype' => '', 'type' => 'string', 'description' => '', + 'default' => '', 'single' => false, 'sanitize_callback' => null, 'auth_callback' => null, @@ -1202,6 +1253,7 @@ * @param string $meta_key Meta key. */ $args = apply_filters( 'register_meta_args', $args, $defaults, $object_type, $meta_key ); + unset( $defaults['default'] ); $args = wp_parse_args( $args, $defaults ); // Require an item schema when registering array meta. @@ -1241,6 +1293,13 @@ } } + if ( array_key_exists( 'default', $args ) ) { + if ( false === $args['single'] && ! wp_is_numeric_array( $args['default'] ) ) { + $args['default'] = array( $args['default'] ); + } + add_filter( "default_{$object_type}_metadata", 'filter_default_metadata', 10, 5 ); + } + // Global registry only contains meta keys registered with the array of arguments added in 4.6.0. if ( ! $has_old_auth_cb && ! $has_old_sanitize_cb ) { unset( $args['object_subtype'] ); @@ -1473,3 +1532,48 @@ */ return apply_filters( "get_object_subtype_{$object_type}", $object_subtype, $object_id ); } + +/** + * Filter into default_{$object_type}_metadata and add in default value. + * + * @since 5.5.0 + * + * @param mixed $value Current value passed to filter. + * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). + + * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for + * the specified object. + * @param bool $single Optional, default is false. + * If true, return only the first value of the specified meta_key. + * This parameter has no effect if meta_key is not specified. + * @param int $object_id ID of the object metadata is for + * + * @return mixed Single metadata default, or array of defaults + */ +function filter_default_metadata( $value, $meta_type, $meta_key, $single, $object_id ) { + if ( wp_installing() ) { + return $value; + } + + $metadata = get_registered_meta_keys( $meta_type ); + + if ( ! isset( $metadata[ $meta_key ] ) ) { + $sub_type = get_object_subtype( $meta_type, $object_id ); + $metadata = get_registered_meta_keys( $meta_type, $sub_type ); + if ( ! isset( $metadata[ $meta_key ] ) ) { + return $value; + } + } + + if ( $single ) { + if ( $metadata[ $meta_key ]['single'] ) { + $value = $metadata[ $meta_key ]['default']; + } else { + $value = $metadata[ $meta_key ]['default'][0]; + } + } else { + $value = $metadata[ $meta_key ]['default']; + } + + return $value; +} Index: tests/phpunit/tests/meta/registerMeta.php IDEA additional info: Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP <+>UTF-8 =================================================================== --- tests/phpunit/tests/meta/registerMeta.php (revision 3d31284c5e658f1fd31b5758b4a18a27778001cb) +++ tests/phpunit/tests/meta/registerMeta.php (date 1588804851205) @@ -504,6 +504,51 @@ $this->assertSame( 'even', $subtype_for_4 ); } + /** + * @ticket 43941 + * @dataProvider data_get_default_data + */ + public function test_get_default_value( $args, $single, $expected ) { + + $object_type = 'post'; + $meta_key = 'registered_key1'; + register_meta( + $object_type, + $meta_key, + $args + ); + + $object_property_name = $object_type . '_id'; + $object_id = self::$$object_property_name; + $default_value = get_metadata_default( $object_type, $meta_key, $single, $object_id ); + $this->assertSame( $default_value, $expected ); + + // Check for default value. + $value = get_metadata( $object_type, $object_id, $meta_key, $single ); + $this->assertSame( $value, $expected ); + + // Set value to check default is not being returned by mistake. + $meta_value = 'dibble'; + update_metadata( $object_type, $object_id, $meta_key, $meta_value ); + $value = get_metadata( $object_type, $object_id, $meta_key, true ); + $this->assertSame( $value, $meta_value ); + + // Delete meta, make sure the default is returned. + delete_metadata( $object_type, $object_id, $meta_key ); + $value = get_metadata( $object_type, $object_id, $meta_key, $single ); + $this->assertSame( $value, $expected ); + + // Set other meta key, to make sure other keys are not effects. + $meta_value = 'hibble'; + $meta_key = 'unregistered_key1'; + $value = get_metadata( $object_type, $object_id, $meta_key, true ); + $this->assertSame( $value, '' ); + update_metadata( $object_type, $object_id, $meta_key, $meta_value ); + $value = get_metadata( $object_type, $object_id, $meta_key, true ); + $this->assertSame( $value, $meta_value ); + + } + public function filter_get_object_subtype_for_customtype( $subtype, $object_id ) { if ( 1 === ( $object_id % 2 ) ) { return 'odd'; @@ -512,6 +557,183 @@ return 'even'; } + public function data_get_default_data() { + return array( + array( + array( + 'single' => true, + 'default' => 'wibble', + ), + true, + 'wibble', + ), + array( + array( + 'single' => true, + 'default' => 'wibble', + ), + false, + array( 'wibble' ), + ), + array( + array( + 'single' => true, + 'default' => array( 'wibble' ), + ), + true, + array( 'wibble' ), + ), + array( + array( + 'single' => true, + 'default' => array( 'wibble' ), + ), + false, + array( 'wibble' ), + ), + array( + array( + 'single' => false, + 'default' => 'wibble', + ), + true, + 'wibble', + ), + array( + array( + 'single' => false, + 'default' => 'wibble', + ), + false, + array( 'wibble' ), + ), + array( + array( + 'single' => false, + 'default' => array( 'wibble' ), + ), + true, + 'wibble', + ), + array( + array( + 'single' => false, + 'default' => array( 'wibble' ), + ), + false, + array( 'wibble' ), + ), + array( + array( + 'single' => true, + 'object_subtype' => 'page', + 'default' => 'wibble', + ), + true, + 'wibble', + ), + array( + array( + 'single' => true, + 'object_subtype' => 'page', + 'default' => 'wibble', + ), + false, + array( 'wibble' ), + ), + array( + array( + 'single' => true, + 'object_subtype' => 'page', + 'default' => array( 'wibble' ), + ), + true, + array( 'wibble' ), + ), + array( + array( + 'single' => true, + 'object_subtype' => 'page', + 'default' => array( 'wibble' ), + ), + false, + array( 'wibble' ), + ), + array( + array( + 'single' => true, + 'object_subtype' => 'post', + 'default' => 'wibble', + ), + true, + '', + ), + array( + array( + 'single' => true, + 'object_subtype' => 'post', + 'default' => 'wibble', + ), + false, + array(), + ), + array( + array( + 'single' => true, + 'object_subtype' => 'post', + 'default' => array( 'wibble' ), + ), + true, + '', + ), + array( + array( + 'single' => true, + 'object_subtype' => 'post', + 'default' => array( 'wibble' ), + ), + false, + array(), + ), + array( + array( + 'single' => true, + 'default' => array( 'wibble' => 'dibble' ), + ), + true, + array( 'wibble' => 'dibble' ), + ), + array( + array( + 'single' => true, + 'default' => array( 'wibble' => 'dibble' ), + ), + false, + array( + array( 'wibble' => 'dibble' ), + ), + ), + array( + array( + 'single' => false, + 'default' => array( 'wibble' => 'dibble' ), + ), + true, + array( 'wibble' => 'dibble' ), + ), + array( + array( + 'single' => false, + 'default' => array( 'wibble' => 'dibble' ), + ), + false, + array( + array( 'wibble' => 'dibble' ), + ), + ), + ); + } + public function data_get_types_and_subtypes() { return array( array( 'post', 'page' ),