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Split shared taxonomy terms on term update.

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When updating an existing taxonomy term that shares its `term_id` with
another term, we generate a new row in `wp_terms` and associate the updated
term_taxonomy_id with the new term. This separates the terms, such that
updating the name of one term does not change the name of any others.

In cases where a plugin or theme stores term IDs in the database, term splitting
can cause backward compatibility issues. The current changeset introduces
two utilities to aid developers with the transition. The `'split_shared_term'`
action fires when the split takes place, and should be used to catch changes in
term_id. In cases where `'split_shared_term'` cannot be used, the
`wp_get_split_term()` function gives developers access to data about terms
that have previously been split. Documentation for these functions, with
examples, can be found in the Plugin Developer Handbook. WordPress itself
stores term IDs in this way in two places; `_wp_check_split_default_terms()`
and `_wp_check_split_terms_in_menus()` are hooked to `'split_shared_term'` to
perform the necessary cleanup.

See [30241] for a previous attempt at the split. It was reverted in [30585]
for 4.1.0.

Props boonebgorges, mboynes.
See #5809.
Built from https://develop.svn.wordpress.org/trunk@31418


git-svn-id: http://core.svn.wordpress.org/trunk@31399 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Boone Gorges 2015-02-11 19:42:25 +00:00
parent 35f4e719b2
commit 44ac816aed
3 changed files with 204 additions and 1 deletions
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4
wp-includes/default-filters.php
View File

@ -306,6 +306,10 @@ add_filter( 'authenticate', 'wp_authenticate_spam_check', 99 );
add_filter( 'determine_current_user', 'wp_validate_auth_cookie' );
add_filter( 'determine_current_user', 'wp_validate_logged_in_cookie', 20 );
// Split term updates.
add_action( 'split_shared_term', '_wp_check_split_default_terms', 10, 4 );
add_action( 'split_shared_term', '_wp_check_split_terms_in_menus', 10, 4 );
/**
* Filters formerly mixed into wp-includes
*/

199
wp-includes/taxonomy.php
View File

@ -3430,6 +3430,12 @@ function wp_update_term( $term_id, $taxonomy, $args = array() ) {
$tt_id = $wpdb->get_var( $wpdb->prepare( "SELECT tt.term_taxonomy_id FROM $wpdb->term_taxonomy AS tt INNER JOIN $wpdb->terms AS t ON tt.term_id = t.term_id WHERE tt.taxonomy = %s AND t.term_id = %d", $taxonomy, $term_id) );
// Check whether this is a shared term that needs splitting.
$_term_id = _split_shared_term( $term_id, $tt_id );
if ( ! is_wp_error( $_term_id ) ) {
$term_id = $_term_id;
}
/**
* Fires immediately before the given terms are edited.
*
@ -4091,6 +4097,199 @@ function _update_generic_term_count( $terms, $taxonomy ) {
}
}
/**
* Create a new term for a term_taxonomy item that currently shares its term with another term_taxonomy.
*
* @since 4.2.0
* @access private
*
* @param int $term_id ID of the shared term.
* @param int $term_taxonomy_id ID of the term_taxonomy item to receive a new term.
* @return int|WP_Error When the current term does not need to be split (or cannot be split on the current database
* schema), `$term_id` is returned. When the term is successfully split, the new term_id is
* returned. A `WP_Error` is returned for miscellaneous errors.
*/
function _split_shared_term( $term_id, $term_taxonomy_id ) {
global $wpdb;
// Don't try to split terms if database schema does not support shared slugs.
$current_db_version = get_option( 'db_version' );
if ( $current_db_version < 30133 ) {
return $term_id;
}
// If there are no shared term_taxonomy rows, there's nothing to do here.
$shared_tt_count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_taxonomy tt WHERE tt.term_id = %d AND tt.term_taxonomy_id != %d", $term_id, $term_taxonomy_id ) );
if ( ! $shared_tt_count ) {
return $term_id;
}
// Pull up data about the currently shared slug, which we'll use to populate the new one.
$shared_term = $wpdb->get_row( $wpdb->prepare( "SELECT t.* FROM $wpdb->terms t WHERE t.term_id = %d", $term_id ) );
$new_term_data = array(
'name' => $shared_term->name,
'slug' => $shared_term->slug,
'term_group' => $shared_term->term_group,
);
if ( false === $wpdb->insert( $wpdb->terms, $new_term_data ) ) {
return new WP_Error( 'db_insert_error', __( 'Could not split shared term.' ), $wpdb->last_error );
}
$new_term_id = (int) $wpdb->insert_id;
// Update the existing term_taxonomy to point to the newly created term.
$wpdb->update( $wpdb->term_taxonomy,
array( 'term_id' => $new_term_id ),
array( 'term_taxonomy_id' => $term_taxonomy_id )
);
// Reassign child terms to the new parent.
$term_taxonomy = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->term_taxonomy WHERE term_taxonomy_id = %d", $term_taxonomy_id ) );
$children_tt_ids = $wpdb->get_col( $wpdb->prepare( "SELECT term_taxonomy_id FROM $wpdb->term_taxonomy WHERE taxonomy = %s AND parent = %d", $term_taxonomy->taxonomy, $term_id ) );
if ( ! empty( $children_tt_ids ) ) {
foreach ( $children_tt_ids as $child_tt_id ) {
$wpdb->update( $wpdb->term_taxonomy,
array( 'parent' => $new_term_id ),
array( 'term_taxonomy_id' => $child_tt_id )
);
clean_term_cache( $term_id, $term_taxonomy->taxonomy );
}
} else {
// If the term has no children, we must force its taxonomy cache to be rebuilt separately.
clean_term_cache( $new_term_id, $term_taxonomy->taxonomy );
}
// Clean the cache for term taxonomies formerly shared with the current term.
$shared_term_taxonomies = $wpdb->get_row( $wpdb->prepare( "SELECT taxonomy FROM $wpdb->term_taxonomy WHERE term_id = %d", $term_id ) );
if ( $shared_term_taxonomies ) {
foreach ( $shared_term_taxonomies as $shared_term_taxonomy ) {
clean_term_cache( $term_id, $shared_term_taxonomy );
}
}
// Keep a record of term_ids that have been split, keyed by old term_id. See {@see wp_get_split_term()}.
$split_term_data = get_option( '_split_terms', array() );
if ( ! isset( $split_term_data[ $term_id ] ) ) {
$split_term_data[ $term_id ] = array();
}
$split_term_data[ $term_id ][ $term_taxonomy->taxonomy ] = $new_term_id;
update_option( '_split_terms', $split_term_data );
/**
* Fires after a previously shared taxonomy term is split into two separate terms.
*
* @since 4.2.0
*
* @param int $term_id ID of the formerly shared term.
* @param int $new_term_id ID of the new term created for the $term_taxonomy_id.
* @param int $term_taxonomy_id ID for the term_taxonomy row affected by the split.
* @param string $taxonomy Taxonomy for the split term.
*/
do_action( 'split_shared_term', $term_id, $new_term_id, $term_taxonomy_id, $term_taxonomy->taxonomy );
return $new_term_id;
}
/**
* Check default categories when a term gets split to see if any of them need to be updated.
*
* @since 4.2.0
* @access private
*
* @param int $term_id ID of the formerly shared term.
* @param int $new_term_id ID of the new term created for the $term_taxonomy_id.
* @param int $term_taxonomy_id ID for the term_taxonomy row affected by the split.
* @param string $taxonomy Taxonomy for the split term.
*/
function _wp_check_split_default_terms( $term_id, $new_term_id, $term_taxonomy_id, $taxonomy ) {
if ( 'category' != $taxonomy ) {
return;
}
foreach ( array( 'default_category', 'default_link_category', 'default_email_category' ) as $option ) {
if ( $term_id == get_option( $option, -1 ) ) {
update_option( $option, $new_term_id );
}
}
}
/**
* Check menu items when a term gets split to see if any of them need to be updated.
*
* @since 4.2.0
* @access private
*
* @param int $term_id ID of the formerly shared term.
* @param int $new_term_id ID of the new term created for the $term_taxonomy_id.
* @param int $term_taxonomy_id ID for the term_taxonomy row affected by the split.
* @param string $taxonomy Taxonomy for the split term.
*/
function _wp_check_split_terms_in_menus( $term_id, $new_term_id, $term_taxonomy_id, $taxonomy ) {
global $wpdb;
$post_ids = $wpdb->get_col( $wpdb->prepare(
"SELECT m1.post_id
FROM {$wpdb->postmeta} AS m1
INNER JOIN {$wpdb->postmeta} AS m2 ON ( m2.post_id = m1.post_id )
INNER JOIN {$wpdb->postmeta} AS m3 ON ( m3.post_id = m1.post_id )
WHERE ( m1.meta_key = '_menu_item_type' AND m1.meta_value = 'taxonomy' )
AND ( m2.meta_key = '_menu_item_object' AND m2.meta_value = '%s' )
AND ( m3.meta_key = '_menu_item_object_id' AND m3.meta_value = %d )",
$taxonomy,
$term_id
) );
if ( $post_ids ) {
foreach ( $post_ids as $post_id ) {
update_post_meta( $post_id, '_menu_item_object_id', $new_term_id, $term_id );
}
}
}
/**
* Get data about terms that previously shared a single term_id, but have since been split.
*
* @since 4.2.0
*
* @param int $old_term_id Term ID. This is the old, pre-split term ID.
* @return array Array of new term IDs, keyed by taxonomy.
*/
function wp_get_split_terms( $old_term_id ) {
$split_terms = get_option( '_split_terms', array() );
$terms = array();
if ( isset( $split_terms[ $old_term_id ] ) ) {
$terms = $split_terms[ $old_term_id ];
}
return $terms;
}
/**
* Get the new term ID corresponding to a previously split term.
*
* @since 4.2.0
*
* @param int $old_term_id Term ID. This is the old, pre-split term ID.
* @param string $taxonomy Taxonomy that the term belongs to.
* @return bool|int If a previously split term is found corresponding to the old term_id and taxonomy, the new term_id
* will be returned. If no previously split term is found matching the parameters, returns false.
*/
function wp_get_split_term( $old_term_id, $taxonomy ) {
$split_terms = wp_get_split_terms( $old_term_id );
$term_id = false;
if ( isset( $split_terms[ $taxonomy ] ) ) {
$term_id = (int) $split_terms[ $taxonomy ];
}
return $term_id;
}
/**
* Generate a permalink for a taxonomy term archive.
*

2
wp-includes/version.php
View File

@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '4.2-alpha-31417';
$wp_version = '4.2-alpha-31418';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.