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<title>[15982] trunk/wp-includes/query.php: Introduce 'fields'
  query var to WP_Query.</title>
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<div id="msg">
<dl>
<dt>Revision</dt> <dd><a href="http://trac.wordpress.org/changeset/15982">15982</a></dd>
<dt>Author</dt> <dd>scribu</dd>
<dt>Date</dt> <dd>2010-10-26 19:01:55 +0000 (Tue, 26 Oct 2010)</dd>
</dl>

<h3>Log Message</h3>
<pre>Introduce 'fields' query var to WP_Query. See <a href="http://trac.wordpress.org/ticket/14777">#14777</a></pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpincludesqueryphp">trunk/wp-includes/query.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkwpincludesqueryphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/query.php (15981 => 15982)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/query.php        2010-10-26 18:15:47 UTC (rev 15981)
+++ trunk/wp-includes/query.php        2010-10-26 19:01:55 UTC (rev 15982)
</span><span class="lines">@@ -1179,10 +1179,11 @@
</span><span class="cx">                         , 'preview'
</span><span class="cx">                         , 's'
</span><span class="cx">                         , 'sentence'
</span><ins>+                        , 'fields'
</ins><span class="cx">                 );
</span><span class="cx"> 
</span><span class="cx">                 foreach ( $keys as $key ) {
</span><del>-                        if ( !isset($array[$key]))
</del><ins>+                        if ( !isset($array[$key]) )
</ins><span class="cx">                                 $array[$key] = '';
</span><span class="cx">                 }
</span><span class="cx"> 
</span><span class="lines">@@ -1190,7 +1191,7 @@
</span><span class="cx">                         'tag__in', 'tag__not_in', 'tag__and', 'tag_slug__in', 'tag_slug__and');
</span><span class="cx"> 
</span><span class="cx">                 foreach ( $array_keys as $key ) {
</span><del>-                        if ( !isset($array[$key]))
</del><ins>+                        if ( !isset($array[$key]) )
</ins><span class="cx">                                 $array[$key] = array();
</span><span class="cx">                 }
</span><span class="cx">                 return $array;
</span><span class="lines">@@ -1640,7 +1641,7 @@
</span><span class="cx">                 $join = '';
</span><span class="cx">                 $search = '';
</span><span class="cx">                 $groupby = '';
</span><del>-                $fields = &quot;$wpdb-&gt;posts.*&quot;;
</del><ins>+                $fields = '';
</ins><span class="cx">                 $post_status_join = false;
</span><span class="cx">                 $page = 1;
</span><span class="cx"> 
</span><span class="lines">@@ -1721,6 +1722,17 @@
</span><span class="cx">                 else
</span><span class="cx">                         $q['no_found_rows'] = false;
</span><span class="cx"> 
</span><ins>+                switch ( $q['fields'] ) {
+                        case 'ids':
+                                $fields = &quot;$wpdb-&gt;posts.ID&quot;;
+                                break;
+                        case 'id=&gt;parent':
+                                $fields = &quot;$wpdb-&gt;posts.ID, $wpdb-&gt;posts.post_parent&quot;;
+                                break;
+                        default:
+                                $fields = &quot;$wpdb-&gt;posts.*&quot;;
+                }
+
</ins><span class="cx">                 // If a month is specified in the querystring, load that month
</span><span class="cx">                 if ( $q['m'] ) {
</span><span class="cx">                         $q['m'] = '' . preg_replace('|[^0-9]|', '', $q['m']);
</span><span class="lines">@@ -2257,6 +2269,7 @@
</span><span class="cx">                         $groupby = 'GROUP BY ' . $groupby;
</span><span class="cx">                 if ( !empty( $orderby ) )
</span><span class="cx">                         $orderby = 'ORDER BY ' . $orderby;
</span><ins>+
</ins><span class="cx">                 $found_rows = '';
</span><span class="cx">                 if ( !$q['no_found_rows'] &amp;&amp; !empty($limits) )
</span><span class="cx">                         $found_rows = 'SQL_CALC_FOUND_ROWS';
</span><span class="lines">@@ -2265,7 +2278,24 @@
</span><span class="cx">                 if ( !$q['suppress_filters'] )
</span><span class="cx">                         $this-&gt;request = apply_filters_ref_array('posts_request', array( $this-&gt;request, &amp;$this ) );
</span><span class="cx"> 
</span><ins>+                if ( 'ids' == $q['fields'] ) {
+                        $this-&gt;posts = $wpdb-&gt;get_col($this-&gt;request);
+
+                        return $this-&gt;posts;
+                }
+
+                if ( 'id=&gt;parent' == $q['fields'] ) {
+                        $this-&gt;posts = $wpdb-&gt;get_results($this-&gt;request);
+
+                        $r = array();
+                        foreach ( $this-&gt;posts as $post )
+                                $r[ $post-&gt;ID ] = $post-&gt;post_parent;
+
+                        return $r;
+                }
+
</ins><span class="cx">                 $this-&gt;posts = $wpdb-&gt;get_results($this-&gt;request);
</span><ins>+
</ins><span class="cx">                 // Raw results filter.  Prior to status checks.
</span><span class="cx">                 if ( !$q['suppress_filters'] )
</span><span class="cx">                         $this-&gt;posts = apply_filters_ref_array('posts_results', array( $this-&gt;posts, &amp;$this ) );
</span></span></pre>
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