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<title>[BuddyPress][7296] branches/1.8: Tell BP_Group_Member_Query queries to order by FIELD()</title>
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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://buddypress.trac.wordpress.org/changeset/7296">7296</a></dd>
<dt>Author</dt> <dd>boonebgorges</dd>
<dt>Date</dt> <dd>2013-07-23 17:31:39 +0000 (Tue, 23 Jul 2013)</dd>
</dl>

<h3>Log Message</h3>
<pre>Tell BP_Group_Member_Query queries to order by FIELD()

BP_Group_Member_Query works by first querying for a list of group members
that match the query params, sorted by date_modified. Then, it feeds those ids
to the BP_User_Query parent class. In order to maintain the proper
date_modified sort, we have to override BP_User_Query's ORDER BY param, and
replace it with ORDER BY FIELD(), using the user ids from the first query.

This fixes a regression in BP 1.8, where the default sort order for
bp_group_has_members() was inadvertantly changed to user_id DESC, rather than
the legacy date_modified that existed before the introduction of
BP_Group_Member_Query.

Fixes <a href="http://buddypress.trac.wordpress.org/ticket/5106">#5106</a></pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches18bpgroupsbpgroupsclassesphp">branches/1.8/bp-groups/bp-groups-classes.php</a></li>
<li><a href="#branches18teststestcasesgroupstemplatephp">branches/1.8/tests/testcases/groups/template.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="branches18bpgroupsbpgroupsclassesphp"></a>
<div class="modfile"><h4>Modified: branches/1.8/bp-groups/bp-groups-classes.php (7295 => 7296)</h4>
<pre class="diff"><span>
<span class="info">--- branches/1.8/bp-groups/bp-groups-classes.php     2013-07-23 15:35:17 UTC (rev 7295)
+++ branches/1.8/bp-groups/bp-groups-classes.php        2013-07-23 17:31:39 UTC (rev 7296)
</span><span class="lines">@@ -966,6 +966,14 @@
</span><span class="cx">  */
</span><span class="cx"> class BP_Group_Member_Query extends BP_User_Query {
</span><span class="cx">  /**
</span><ins>+        * Array of group member ids, cached to prevent redundant lookups
+        *
+        * @var null|array Null if not yet defined, otherwise an array of ints
+        * @since BuddyPress (1.8.1)
+        */
+       protected $group_member_ids;
+
+       /**
</ins><span class="cx">    * Set up action hooks
</span><span class="cx">   *
</span><span class="cx">   * @since BuddyPress (1.8)
</span><span class="lines">@@ -978,6 +986,9 @@
</span><span class="cx">                  $this->query_vars_raw['type'] = 'last_modified';
</span><span class="cx">          }
</span><span class="cx"> 
</span><ins>+               // Set the sort order
+               add_action( 'bp_pre_user_query', array( $this, 'set_orderby' ) );
+
</ins><span class="cx">           // Set up our populate_extras method
</span><span class="cx">          add_action( 'bp_user_query_populate_extras', array( $this, 'populate_group_member_extras' ), 10, 2 );
</span><span class="cx">  }
</span><span class="lines">@@ -1028,6 +1039,10 @@
</span><span class="cx">  protected function get_group_member_ids() {
</span><span class="cx">          global $wpdb;
</span><span class="cx"> 
</span><ins>+               if ( is_array( $this->group_member_ids ) ) {
+                       return $this->group_member_ids;
+               }
+
</ins><span class="cx">           $bp  = buddypress();
</span><span class="cx">          $sql = array(
</span><span class="cx">                  'select'  => "SELECT user_id FROM {$bp->groups->table_name_members}",
</span><span class="lines">@@ -1106,10 +1121,34 @@
</span><span class="cx">          $sql['order']   = "DESC";
</span><span class="cx"> 
</span><span class="cx">          /** LIMIT clause ******************************************************/
</span><ins>+               $this->group_member_ids = $wpdb->get_col( "{$sql['select']} {$sql['where']} {$sql['orderby']} {$sql['order']} {$sql['limit']}" );
</ins><span class="cx"> 
</span><del>-               $ids = $wpdb->get_col( "{$sql['select']} {$sql['where']} {$sql['orderby']} {$sql['order']} {$sql['limit']}" );
</del><ins>+                return $this->group_member_ids;
+       }
</ins><span class="cx"> 
</span><del>-               return $ids;
</del><ins>+        /**
+        * Tell BP_User_Query to order by the order of our query results
+        *
+        * This implementation assumes the 'last_modified' sort order
+        * hardcoded in BP_Group_Member_Query::get_group_member_ids().
+        *
+        * @param object $query BP_User_Query object
+        */
+       public function set_orderby( $query ) {
+               $gm_ids = $this->get_group_member_ids();
+               if ( empty( $gm_ids ) ) {
+                       $gm_ids = array( 0 );
+               }
+
+               // The first param in the FIELD() clause is the sort column id
+               $gm_ids = array_merge( array( 'u.id' ), wp_parse_id_list( $gm_ids ) );
+               $gm_ids_sql = implode( ',', $gm_ids );
+
+               $query->uid_clauses['orderby'] = "ORDER BY FIELD(" . $gm_ids_sql . ")";
+
+               // Prevent this filter from running on future BP_User_Query
+               // instances on the same page
+               remove_action( 'bp_pre_user_query', array( $this, 'set_orderby' ) );
</ins><span class="cx">   }
</span><span class="cx"> 
</span><span class="cx">  /**
</span></span></pre></div>
<a id="branches18teststestcasesgroupstemplatephp"></a>
<div class="modfile"><h4>Modified: branches/1.8/tests/testcases/groups/template.php (7295 => 7296)</h4>
<pre class="diff"><span>
<span class="info">--- branches/1.8/tests/testcases/groups/template.php 2013-07-23 15:35:17 UTC (rev 7295)
+++ branches/1.8/tests/testcases/groups/template.php    2013-07-23 17:31:39 UTC (rev 7296)
</span><span class="lines">@@ -351,4 +351,44 @@
</span><span class="cx">          $this->assertEquals( array( $u1, $u2, ), $ids );
</span><span class="cx">  }
</span><span class="cx"> 
</span><ins>+       /**
+        * Default sort order should be the joined date
+        *
+        * @tickett BP5106
+        * @group bp_group_has_members
+        */
+       public function test_bp_group_has_members_default_order() {
+               $u1 = $this->create_user( array(
+                       'last_activity' => gmdate( 'Y-m-d H:i:s', time() - 60 ),
+               ) );
+               $u2 = $this->create_user( array(
+                       'last_activity' => gmdate( 'Y-m-d H:i:s', time() - 600 ),
+               ) );
+               $u3 = $this->create_user( array(
+                       'last_activity' => gmdate( 'Y-m-d H:i:s', time() - 6000 ),
+               ) );
+
+
+               $g = $this->factory->group->create( array(
+                       'creator_id' => $u1,
+               ) );
+
+               $this->add_user_to_group( $u2, $g, array(
+                       'date_modified' => gmdate( 'Y-m-d H:i:s', time() - 60*60*24 ),
+               ) );
+
+               $this->add_user_to_group( $u3, $g, array(
+                       'date_modified' => gmdate( 'Y-m-d H:i:s', time() - 60*60*12 ),
+               ) );
+
+               global $members_template;
+               bp_group_has_members( array(
+                       'group_id' => $g,
+                       'exclude_banned' => 0,
+                       'exclude_admins_mods' => false,
+               ) );
+
+               $ids = wp_parse_id_list( wp_list_pluck( $members_template->members, 'user_id' ) );
+               $this->assertEquals( array( $u1, $u3, $u2, ), $ids );
+       }
</ins><span class="cx"> }
</span></span></pre>
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