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<title>[27102] trunk: Regenerate the term hierarchy cache (`{taxonomy}_children`) when it is out of sync with the passed taxonomy's `last_changed` value.</title>
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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/27102">27102</a></dd>
<dt>Author</dt> <dd>wonderboymusic</dd>
<dt>Date</dt> <dd>2014-02-06 01:58:01 +0000 (Thu, 06 Feb 2014)</dd>
</dl>

<h3>Log Message</h3>
<pre>Regenerate the term hierarchy cache (`{taxonomy}_children`) when it is out of sync with the passed taxonomy's `last_changed` value.

Introduces `taxonomy_hierarchy_is_fresh()`, which is only called in `_get_term_hierarchy()`. The taxonomy's `last_changed` value is checked against the value of `wp_cache_get( 'hierarchy_last_changed', $taxonomy )`.

Adds a unit test - `Tests_Term:test_hierachy_invalidation()`.

See <a href="http://core.trac.wordpress.org/changeset/27101">[27101]</a>, which makes this type of cache invalidation possible.
Fixes <a href="http://core.trac.wordpress.org/ticket/14485">#14485</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludestaxonomyphp">trunk/src/wp-includes/taxonomy.php</a></li>
<li><a href="#trunktestsphpunitteststermphp">trunk/tests/phpunit/tests/term.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludestaxonomyphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/taxonomy.php (27101 => 27102)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/taxonomy.php       2014-02-06 01:40:05 UTC (rev 27101)
+++ trunk/src/wp-includes/taxonomy.php  2014-02-06 01:58:01 UTC (rev 27102)
</span><span class="lines">@@ -2948,7 +2948,10 @@
</span><span class="cx"> function _get_term_hierarchy($taxonomy) {
</span><span class="cx">  if ( !is_taxonomy_hierarchical($taxonomy) )
</span><span class="cx">          return array();
</span><del>-       $children = get_option("{$taxonomy}_children");
</del><ins>+        $children = false;
+       if ( taxonomy_hierarchy_is_fresh( $taxonomy ) ) {
+               $children = get_option("{$taxonomy}_children");
+       }
</ins><span class="cx"> 
</span><span class="cx">  if ( is_array($children) )
</span><span class="cx">          return $children;
</span><span class="lines">@@ -3521,6 +3524,7 @@
</span><span class="cx"> /**
</span><span class="cx">  * Determine if a post's cache for the passed taxonomy
</span><span class="cx">  *  is in sync.
</span><ins>+ * 
</ins><span class="cx">  * @since 3.9.0
</span><span class="cx">  *
</span><span class="cx">  * @param int $id
</span><span class="lines">@@ -3535,4 +3539,24 @@
</span><span class="cx">          return false;
</span><span class="cx">  }
</span><span class="cx">  return true;
</span><ins>+}
+
+/**
+ * Determine if a hierarchy's cache for the passed taxonomy
+ *  is in sync.
+ *
+ * @since 3.9.0
+ *
+ * @param int $id
+ * @param string $taxonomy
+ * @return boolean
+ */
+function taxonomy_hierarchy_is_fresh( $taxonomy ) {
+       $last_changed = get_taxonomy_last_changed( $taxonomy );
+       $hierarchy_last_changed = wp_cache_get( 'hierarchy_last_changed', $taxonomy );
+       if ( ! $hierarchy_last_changed || $last_changed !== $hierarchy_last_changed ) {
+               wp_cache_set( 'hierarchy_last_changed', $last_changed, $taxonomy );
+               return false;
+       }
+       return true;
</ins><span class="cx"> }
</span><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunktestsphpunitteststermphp"></a>
<div class="modfile"><h4>Modified: trunk/tests/phpunit/tests/term.php (27101 => 27102)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/tests/phpunit/tests/term.php       2014-02-06 01:40:05 UTC (rev 27101)
+++ trunk/tests/phpunit/tests/term.php  2014-02-06 01:58:01 UTC (rev 27102)
</span><span class="lines">@@ -585,7 +585,7 @@
</span><span class="cx">          $last_changed3 = get_taxonomy_last_changed( 'category' );
</span><span class="cx">          $this->assertNotEquals( $last_changed2, $last_changed3 );
</span><span class="cx">  }
</span><del>-       
</del><ins>+
</ins><span class="cx">   /**
</span><span class="cx">   * @ticket 22526
</span><span class="cx">   */
</span><span class="lines">@@ -634,4 +634,49 @@
</span><span class="cx">          $cats2 = get_the_category( $post->ID );
</span><span class="cx">          $this->assertNotEquals( $term->name, reset( $cats2 )->name );
</span><span class="cx">  }
</span><ins>+
+       function test_hierachy_invalidation() {
+               $tax = 'burrito';
+               register_taxonomy( $tax, 'post', array( 'hierarchical' => true ) );
+               $this->assertTrue( get_taxonomy( $tax )->hierarchical );
+
+               $step = 1;
+               $parent_id = 0;
+               $children = 0;
+
+               foreach ( range( 1, 99 ) as $i ) {
+                       switch ( $step ) {
+                       case 1:
+                               $parent = wp_insert_term( 'Parent' . $i, $tax );
+                               $parent_id = $parent['term_id'];
+                               break;
+                       case 2:
+                               $parent = wp_insert_term( 'Child' . $i, $tax, array( 'parent' => $parent_id ) );
+                               $parent_id = $parent['term_id'];
+                               $children++;
+                               break;
+                       case 3:
+                               wp_insert_term( 'Grandchild' . $i, $tax, array( 'parent' => $parent_id ) );
+                               $parent_id = 0;
+                               $children++;
+                               break;
+                       }
+
+                       $terms = get_terms( $tax, array( 'hide_empty' => false ) );
+                       $this->assertEquals( $i, count( $terms ) );
+                       if ( 1 < $i ) {
+                               $hierarchy = _get_term_hierarchy( $tax );
+                               $this->assertNotEmpty( $hierarchy );
+                               $this->assertEquals( $children, count( $hierarchy, COUNT_RECURSIVE ) - count( $hierarchy ) );
+                       }
+
+                       if ( $i % 3 === 0 ) {
+                               $step = 1;
+                       } else {
+                               $step++;
+                       }
+               }
+
+               _unregister_taxonomy( $tax );
+       }
</ins><span class="cx"> }
</span></span></pre>
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