Improve lazyloading of term metadata in `WP_Query` loops.
[34529] introduced lazyloading for the metadata belonging to terms matching posts in the main `WP_Query`. The current changeset improves this technique in the following ways: * Term meta lazyloading is now performed on the results of all `WP_Query` queries, not just the main query. * Fewer global variable touches and greater encapsulation. * The logic for looping through posts to identify terms is now only performed once per `WP_Query`. Props dlh, boonebgorges. See #34047. Built from https://develop.svn.wordpress.org/trunk@34704 git-svn-id: http://core.svn.wordpress.org/trunk@34668 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -201,7 +201,6 @@ add_filter( 'pingback_ping_source_uri', 'pingback_ping_source_uri' );
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add_filter( 'xmlrpc_pingback_error', 'xmlrpc_pingback_error' );
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add_filter( 'title_save_pre', 'trim' );
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add_filter( 'get_comment_metadata', 'wp_lazyload_comment_meta', 10, 2 );
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add_filter( 'get_term_metadata', 'wp_lazyload_term_meta', 10, 2 );
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add_filter( 'http_request_host_is_external', 'allowed_http_request_hosts', 10, 2 );
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@ -1302,6 +1302,15 @@ class WP_Query {
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*/
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public $thumbnails_cached = false;
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/**
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* Whether the term meta cache for matched posts has been primed.
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*
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* @since 4.4.0
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* @access protected
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* @var bool
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*/
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public $updated_term_meta_cache = false;
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/**
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* Cached list of search stopwords.
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*
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@ -3541,6 +3550,11 @@ class WP_Query {
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if ( $this->posts )
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$this->posts = array_map( 'get_post', $this->posts );
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if ( $q['update_post_term_cache'] ) {
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add_action( 'get_term_metadata', array( $this, 'lazyload_term_meta' ), 10, 2 );
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}
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if ( ! $q['suppress_filters'] ) {
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/**
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* Filter the raw post results array, prior to status checks.
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@ -4722,6 +4736,86 @@ class WP_Query {
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$this->setup_postdata( $this->post );
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}
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}
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/**
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* Lazy-loads termmeta for located posts.
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*
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* As a rule, term queries (`get_terms()` and `wp_get_object_terms()`) prime the metadata cache for matched
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* terms by default. However, this can cause a slight performance penalty, especially when that metadata is
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* not actually used. In the context of a `WP_Query` instance, we're able to avoid this potential penalty.
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* `update_object_term_cache()`, called from `update_post_caches()`, does not 'update_term_meta_cache'.
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* Instead, the first time `get_term_meta()` is called from within a `WP_Query` loop, the current method
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* detects the fact, and then primes the metadata cache for all terms attached to all posts in the loop,
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* with a single database query.
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*
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* This method is public so that it can be used as a filter callback. As a rule, there is no need to invoke it
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* directly, from either inside or outside the `WP_Query` object.
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*
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* @since 4.4.0
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* @access public
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*
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* @param null $check The `$check` param passed from the 'pre_term_metadata' hook.
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* @param int $term_id ID of the term whose metadata is being cached.
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* @return mixed In order not to short-circuit `get_metadata()`. Generally, this is `null`, but it could be
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* another value if filtered by a plugin.
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*/
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public function lazyload_term_meta( $check, $term_id ) {
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/*
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* We only do this once per `WP_Query` instance.
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* Can't use `remove_action()` because of non-unique object hashes.
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*/
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if ( $this->updated_term_meta_cache ) {
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return $check;
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}
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// We can only lazyload if the entire post object is present.
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$posts = array();
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foreach ( $this->posts as $post ) {
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if ( $post instanceof WP_Post ) {
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$posts[] = $post;
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}
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}
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$_p = array();
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foreach ( $posts as $post ) {
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$_p[] = $post->ID;
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}
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if ( ! empty( $posts ) ) {
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// Fetch cached term_ids for each post. Keyed by term_id for faster lookup.
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$term_ids = array();
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foreach ( $posts as $post ) {
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$taxonomies = get_object_taxonomies( $post->post_type );
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foreach ( $taxonomies as $taxonomy ) {
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// Term cache should already be primed by 'update_post_term_cache'.
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$terms = get_object_term_cache( $post->ID, $taxonomy );
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if ( false !== $terms ) {
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foreach ( $terms as $term ) {
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if ( ! isset( $term_ids[ $term->term_id ] ) ) {
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$term_ids[ $term->term_id ] = 1;
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}
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}
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}
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}
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}
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/*
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* Only update the metadata cache for terms belonging to these posts if the term_id passed
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* to `get_term_meta()` matches one of those terms. This prevents a single call to
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* `get_term_meta()` from priming metadata for all `WP_Query` objects.
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*/
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if ( isset( $term_ids[ $term_id ] ) ) {
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update_termmeta_cache( array_keys( $term_ids ) );
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$this->updated_term_meta_cache = true;
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}
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}
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// If no terms were found, there's no need to run this again.
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if ( empty( $term_ids ) ) {
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$this->updated_term_meta_cache = true;
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}
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return $check;
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}
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}
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/**
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@ -1588,63 +1588,6 @@ function update_termmeta_cache( $term_ids ) {
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return update_meta_cache( 'term', $term_ids );
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}
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/**
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* Lazy-loads termmeta when inside of a `WP_Query` loop.
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*
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* As a rule, term queries (`get_terms()` and `wp_get_object_terms()`) prime the metadata cache for matched terms by
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* default. However, this can cause a slight performance penalty, especially when that metadata is not actually used.
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* In the context of a `WP_Query` loop, we're able to avoid this potential penalty. `update_object_term_cache()`,
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* called from `update_post_caches()`, does not 'update_term_meta_cache'. Instead, the first time `get_term_meta()` is
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* called from within a `WP_Query` loop, the current function detects the fact, and then primes the metadata cache for
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* all terms attached to all posts in the loop, with a single database query.
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*
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* @since 4.4.0
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*
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* @param null $check The `$check` param passed from the 'pre_term_metadata' hook.
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* @param int $term_id ID of the term whose metadata is being cached.
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* @return null In order not to short-circuit `get_metadata()`.
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*/
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function wp_lazyload_term_meta( $check, $term_id ) {
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global $wp_query;
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if ( $wp_query instanceof WP_Query && ! empty( $wp_query->posts ) && $wp_query->get( 'update_post_term_cache' ) ) {
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// We can only lazyload if the entire post object is present.
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$posts = array();
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foreach ( $wp_query->posts as $post ) {
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if ( $post instanceof WP_Post ) {
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$posts[] = $post;
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}
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}
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if ( empty( $posts ) ) {
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return;
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}
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// Fetch cached term_ids for each post. Keyed by term_id for faster lookup.
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$term_ids = array();
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foreach ( $posts as $post ) {
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$taxonomies = get_object_taxonomies( $post->post_type );
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foreach ( $taxonomies as $taxonomy ) {
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// No extra queries. Term cache should already be primed by 'update_post_term_cache'.
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$terms = get_object_term_cache( $post->ID, $taxonomy );
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if ( false !== $terms ) {
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foreach ( $terms as $term ) {
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if ( ! isset( $term_ids[ $term->term_id ] ) ) {
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$term_ids[ $term->term_id ] = 1;
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}
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}
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}
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}
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}
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if ( $term_ids ) {
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update_termmeta_cache( array_keys( $term_ids ) );
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}
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}
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return $check;
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}
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/**
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* Check if Term exists.
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*
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@ -4,7 +4,7 @@
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*
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* @global string $wp_version
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*/
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$wp_version = '4.4-alpha-34703';
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$wp_version = '4.4-alpha-34704';
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/**
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* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
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