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<title>[37589] trunk: Allow term meta lazy-loading to be selectively disabled in `WP_Query`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/37589">37589</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/37589","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>boonebgorges</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-05-28 03:09:09 +0000 (Sat, 28 May 2016)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Allow term meta lazy-loading to be selectively disabled in `WP_Query`.

The process of lazy-loading can be resource intensive for object that have
terms in large numbers of taxonomies and are running a persistent object cache.
This new parameter allows the feature to be disabled in these cases.

Props DBrumbaugh10Up.
See <a href="https://core.trac.wordpress.org/ticket/36953">#36953</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesqueryphp">trunk/src/wp-includes/query.php</a></li>
<li><a href="#trunktestsphpunitteststermmetaphp">trunk/tests/phpunit/tests/term/meta.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesqueryphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/query.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/query.php   2016-05-27 19:19:12 UTC (rev 37588)
+++ trunk/src/wp-includes/query.php     2016-05-28 03:09:09 UTC (rev 37589)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1468,7 +1468,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 4.5.0 Removed the `$comments_popup` parameter.
</span><span class="cx" style="display: block; padding: 0 10px">         *              Introduced the `$comment_status` and `$ping_status` parameters.
</span><span class="cx" style="display: block; padding: 0 10px">         *              Introduced `RAND(x)` syntax for `$orderby`, which allows an integer seed value to random sorts.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         * @since 4.6.0 Added 'post_name__in' support for `$orderby`.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+  * @since 4.6.0 Added 'post_name__in' support for `$orderby`. Introduced `$lazy_load_term_meta`.
</ins><span class="cx" style="display: block; padding: 0 10px">          * @access public
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @param string|array $query {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1567,6 +1567,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">         *     @type string       $title                   Post title.
</span><span class="cx" style="display: block; padding: 0 10px">         *     @type bool         $update_post_meta_cache  Whether to update the post meta cache. Default true.
</span><span class="cx" style="display: block; padding: 0 10px">         *     @type bool         $update_post_term_cache  Whether to update the post term cache. Default true.
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         *     @type bool         $lazy_load_term_meta     Whether to lazy-load term meta. Setting to false will
+        *                                                 disable cache priming for term meta, so that each
+        *                                                 get_term_meta() call will hit the database.
+        *                                                 Defaults to the value of `$update_post_term_cache`.
</ins><span class="cx" style="display: block; padding: 0 10px">          *     @type int          $w                       The week number of the year. Default empty. Accepts numbers 0-53.
</span><span class="cx" style="display: block; padding: 0 10px">         *     @type int          $year                    The four-digit year. Default empty. Accepts any four-digit year.
</span><span class="cx" style="display: block; padding: 0 10px">         * }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2545,6 +2549,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                if ( !isset($q['update_post_term_cache']) )
</span><span class="cx" style="display: block; padding: 0 10px">                        $q['update_post_term_cache'] = true;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                if ( ! isset( $q['lazy_load_term_meta'] ) ) {
+                       $q['lazy_load_term_meta'] = $q['update_post_term_cache'];
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 if ( !isset($q['update_post_meta_cache']) )
</span><span class="cx" style="display: block; padding: 0 10px">                        $q['update_post_meta_cache'] = true;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3782,7 +3790,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->posts = array();
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( $q['update_post_term_cache'] ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( $q['lazy_load_term_meta'] ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         wp_queue_posts_for_term_meta_lazyload( $this->posts );
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunktestsphpunitteststermmetaphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/term/meta.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/term/meta.php   2016-05-27 19:19:12 UTC (rev 37588)
+++ trunk/tests/phpunit/tests/term/meta.php     2016-05-28 03:09:09 UTC (rev 37589)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -150,6 +150,61 @@
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        /**
+        * @ticket 36593
+        */
+       public function test_lazy_load_term_meta_should_fall_back_on_update_post_term_cache() {
+               $q = new WP_Query( array(
+                       'update_post_term_cache' => true,
+               ) );
+
+               $this->assertTrue( $q->get( 'lazy_load_term_meta' ) );
+
+               $q = new WP_Query( array(
+                       'update_post_term_cache' => false,
+               ) );
+
+               $this->assertFalse( $q->get( 'lazy_load_term_meta' ) );
+       }
+
+       /**
+        * @ticket 36593
+        */
+       public function test_lazy_load_term_meta_false() {
+               global $wpdb;
+
+               $p = self::factory()->post->create( array( 'post_status' => 'publish' ) );
+
+               register_taxonomy( 'wptests_tax', 'post' );
+               $terms = self::factory()->term->create_many( 3, array( 'taxonomy' => 'wptests_tax' ) );
+               wp_set_object_terms( $p, $terms, 'wptests_tax' );
+               foreach ( $terms as $t ) {
+                       add_term_meta( $t, 'foo', 'bar' );
+               }
+
+               $q = new WP_Query( array(
+                       'cache_results' => true,
+                       'update_post_term_cache' => true,
+                       'lazy_load_term_meta' => false,
+               ) );
+
+               if ( $q->have_posts() ) {
+                       while ( $q->have_posts() ) {
+                               $q->the_post();
+
+                               // Requests will hit the database.
+                               $num_queries = $wpdb->num_queries;
+                               $this->assertSame( 'bar', get_term_meta( $terms[0], 'foo', true ) );
+                               $num_queries++;
+                               $this->assertSame( $num_queries, $wpdb->num_queries );
+
+                               $this->assertSame( 'bar', get_term_meta( $terms[1], 'foo', true ) );
+                               $num_queries++;
+                               $this->assertSame( $num_queries, $wpdb->num_queries );
+                       }
+               }
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         public function test_adding_term_meta_should_bust_get_terms_cache() {
</span><span class="cx" style="display: block; padding: 0 10px">                $terms = self::factory()->term->create_many( 2, array( 'taxonomy' => 'wptests_tax' ) );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre>
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