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Introduce metadata for taxonomy terms.

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Adds a new table to the database schema (`wp_termmeta`), and a set of
`*_term_meta()` API functions. `get_terms()` and `wp_get_object_terms()`
now also support 'meta_query' parameters, with syntax identical to other
uses of `WP_Meta_Query`.

When fetching terms via `get_terms()` or `wp_get_object_terms()`, metadata for
matched terms is preloaded into the cache by default. Disable this behavior
by setting the new `$update_term_meta_cache` paramater to `false`.

To maximize performance, within `WP_Query` loops, the termmeta cache is *not*
primed by default. Instead, we use a lazy-loading technique: metadata for all
terms belonging to posts in the loop is loaded into the cache the first time
that `get_term_meta()` is called within the loop.

Props boonebgorges, sirzooro.
See #10142.

git-svn-id: https://develop.svn.wordpress.org/trunk@34529 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Boone Gorges
2015-09-25 03:58:59 +00:00
parent a98ca8b314
commit 3425177325
9 changed files with 528 additions and 8 deletions
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11
src/wp-admin/includes/schema.php
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@@ -57,7 +57,16 @@ function wp_get_db_schema( $scope = 'all', $blog_id = null ) {
$max_index_length = 191;
// Blog specific tables.
$blog_tables = "CREATE TABLE $wpdb->terms (
$blog_tables = "CREATE TABLE $wpdb->termmeta (
meta_id bigint(20) unsigned NOT NULL auto_increment,
term_id bigint(20) unsigned NOT NULL default '0',
meta_key varchar(255) default NULL,
meta_value longtext,
PRIMARY KEY (meta_id),
KEY term_id (term_id),
KEY meta_key (meta_key($max_index_length))
) $charset_collate;
CREATE TABLE $wpdb->terms (
term_id bigint(20) unsigned NOT NULL auto_increment,
name varchar(200) NOT NULL default '',
slug varchar(200) NOT NULL default '',