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<title>[BuddyPress][8224] trunk: When prefetching group data for an activity loop, avoid the query when there's nothing to fetch</title>
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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://buddypress.trac.wordpress.org/changeset/8224">8224</a></dd>
<dt>Author</dt> <dd>boonebgorges</dd>
<dt>Date</dt> <dd>2014-03-31 21:27:11 +0000 (Mon, 31 Mar 2014)</dd>
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<h3>Log Message</h3>
<pre>When prefetching group data for an activity loop, avoid the query when there's nothing to fetch

When there are no uncached_ids, don't attempt to query. There's nothing to get,
and it will result in an invalidly formatted SQL query.

Fixes <a href="http://buddypress.trac.wordpress.org/ticket/5503">#5503</a></pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkbpgroupsbpgroupsactivityphp">trunk/bp-groups/bp-groups-activity.php</a></li>
<li><a href="#trunkteststestcasesgroupscachephp">trunk/tests/testcases/groups/cache.php</a></li>
</ul>

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<div id="patch">
<h3>Diff</h3>
<a id="trunkbpgroupsbpgroupsactivityphp"></a>
<div class="modfile"><h4>Modified: trunk/bp-groups/bp-groups-activity.php (8223 => 8224)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/bp-groups/bp-groups-activity.php   2014-03-31 20:15:00 UTC (rev 8223)
+++ trunk/bp-groups/bp-groups-activity.php      2014-03-31 21:27:11 UTC (rev 8224)
</span><span class="lines">@@ -143,11 +143,13 @@
</span><span class="cx">                  }
</span><span class="cx">          }
</span><span class="cx"> 
</span><del>-               global $wpdb, $bp;
-               $uncached_ids_sql = implode( ',', wp_parse_id_list( $uncached_ids ) );
-               $groups = $wpdb->get_results( "SELECT * FROM {$bp->groups->table_name} WHERE id IN ({$uncached_ids_sql})" );
-               foreach ( $groups as $group ) {
-                       wp_cache_set( $group->id, $group, 'bp_groups' );
</del><ins>+                if ( ! empty( $uncached_ids ) ) {
+                       global $wpdb, $bp;
+                       $uncached_ids_sql = implode( ',', wp_parse_id_list( $uncached_ids ) );
+                       $groups = $wpdb->get_results( "SELECT * FROM {$bp->groups->table_name} WHERE id IN ({$uncached_ids_sql})" );
+                       foreach ( $groups as $group ) {
+                               wp_cache_set( $group->id, $group, 'bp_groups' );
+                       }
</ins><span class="cx">           }
</span><span class="cx">  }
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkteststestcasesgroupscachephp"></a>
<div class="modfile"><h4>Modified: trunk/tests/testcases/groups/cache.php (8223 => 8224)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/tests/testcases/groups/cache.php   2014-03-31 20:15:00 UTC (rev 8223)
+++ trunk/tests/testcases/groups/cache.php      2014-03-31 21:27:11 UTC (rev 8224)
</span><span class="lines">@@ -101,4 +101,57 @@
</span><span class="cx">          $this->assertFalse( wp_cache_get( $g, 'bp_groups' ) );
</span><span class="cx">  }
</span><span class="cx"> 
</span><ins>+       /**
+        * @group bp_groups_prefetch_activity_object_data
+        */
+       public function test_bp_groups_prefetch_activity_object_data_all_cached() {
+               $g = $this->factory->group->create();
+
+               // Prime cache
+               groups_get_group( array( 'group_id' => $g ) );
+
+               // fake an activity
+               $a = new stdClass;
+               $a->component = buddypress()->groups->id;
+               $a->item_id = $g;
+               $activities = array(
+                       $a,
+               );
+
+               bp_groups_prefetch_activity_object_data( $activities );
+
+               // This assertion is not really necessary - just checks to see
+               // whether a fatal error has occurred above
+               $this->assertNotEmpty( wp_cache_get( $g, 'bp_groups' ) );
+       }
+
+       /**
+        * @group bp_groups_prefetch_activity_object_data
+        */
+       public function test_bp_groups_prefetch_activity_object_data_some_cached() {
+               $g1 = $this->factory->group->create();
+               $g2 = $this->factory->group->create();
+
+               // Prime cache
+               groups_get_group( array( 'group_id' => $g1 ) );
+
+               // fake activities
+               $a1 = new stdClass;
+               $a1->component = buddypress()->groups->id;
+               $a1->item_id = $g1;
+
+               $a2 = new stdClass;
+               $a2->component = buddypress()->groups->id;
+               $a2->item_id = $g2;
+
+               $activities = array(
+                       $a1,
+                       $a2,
+               );
+
+               bp_groups_prefetch_activity_object_data( $activities );
+
+               $this->assertNotEmpty( wp_cache_get( $g1, 'bp_groups' ) );
+               $this->assertNotEmpty( wp_cache_get( $g2, 'bp_groups' ) );
+       }
</ins><span class="cx"> }
</span></span></pre>
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