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<title>[44452] trunk: Query: Standardize treatment of 'orderby' values `post__in`, `post_parent__in`, and `post_name__in`.</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/44452">44452</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/44452","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>2019-01-08 03:32:04 +0000 (Tue, 08 Jan 2019)</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'>Query: Standardize treatment of 'orderby' values `post__in`, `post_parent__in`, and `post_name__in`.

Ordering by `post__in` was introduced in <a href="https://core.trac.wordpress.org/changeset/21776">[21776]</a>, but the code assumed that
`post__in` would be a comma-separated string listing post IDs. When an array
of post IDs was passed to the `post__in` query var, 'orderby=post__in' was
not respected. This changeset changes this behavior by handling
'orderby=post__in' in the same way as most other values of 'orderby',
which ensures that arrays as well as strings can be properly parsed.

The same treatment is given to the similar `post_name__in` and
`post_parent__in` options of 'orderby', so that most query generation for
orderby clauses happens in the same place, instead of in special cases.

A slight change in the resulting SQL (related to the whitespace around
parentheses and commas) necessitates a change to an existing REST API test
that does a string comparison against the SQL query.

Props mgibbs189, kelvink.
Fixes <a href="https://core.trac.wordpress.org/ticket/38034">#38034</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpqueryphp">trunk/src/wp-includes/class-wp-query.php</a></li>
<li><a href="#trunktestsphpunittestspostqueryphp">trunk/tests/phpunit/tests/post/query.php</a></li>
<li><a href="#trunktestsphpunittestsrestapirestpostscontrollerphp">trunk/tests/phpunit/tests/rest-api/rest-posts-controller.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpqueryphp"></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/class-wp-query.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-query.php  2019-01-08 03:28:15 UTC (rev 44451)
+++ trunk/src/wp-includes/class-wp-query.php    2019-01-08 03:32:04 UTC (rev 44452)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1546,6 +1546,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        'menu_order',
</span><span class="cx" style="display: block; padding: 0 10px">                        'comment_count',
</span><span class="cx" style="display: block; padding: 0 10px">                        'rand',
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        'post__in',
+                       'post_parent__in',
+                       'post_name__in',
</ins><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">                $primary_meta_key   = '';
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1576,6 +1579,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        return false;
</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">+                $orderby_clause = '';
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 switch ( $orderby ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        case 'post_name':
</span><span class="cx" style="display: block; padding: 0 10px">                        case 'post_author':
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1603,6 +1608,23 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        case 'meta_value_num':
</span><span class="cx" style="display: block; padding: 0 10px">                                $orderby_clause = "{$primary_meta_query['alias']}.meta_value+0";
</span><span class="cx" style="display: block; padding: 0 10px">                                break;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        case 'post__in':
+                               if ( ! empty( $this->query_vars['post__in'] ) ) {
+                                       $orderby_clause = "FIELD({$wpdb->posts}.ID," . implode( ',', array_map( 'absint', $this->query_vars['post__in'] ) ) . ')';
+                               }
+                               break;
+                       case 'post_parent__in':
+                               if ( ! empty( $this->query_vars['post_parent__in'] ) ) {
+                                       $orderby_clause = "FIELD( {$wpdb->posts}.post_parent," . implode( ', ', array_map( 'absint', $this->query_vars['post_parent__in'] ) ) . ' )';
+                               }
+                               break;
+                       case 'post_name__in':
+                               if ( ! empty( $this->query_vars['post_name__in'] ) ) {
+                                       $post_name__in = array_map( 'sanitize_title_for_query', $this->query_vars['post_name__in'] );
+                                       $post_name__in_string = "'" . implode( "','", $post_name__in ) . "'";
+                                       $orderby_clause = "FIELD( {$wpdb->posts}.post_name," . $post_name__in_string . ' )';
+                               }
+                               break;
</ins><span class="cx" style="display: block; padding: 0 10px">                         default:
</span><span class="cx" style="display: block; padding: 0 10px">                                if ( array_key_exists( $orderby, $meta_clauses ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                        // $orderby corresponds to a meta_query clause.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2239,6 +2261,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $q['order'] = $rand ? '' : $this->parse_order( $q['order'] );
</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">+                // These values of orderby should ignore the 'order' parameter.
+               $force_asc = array( 'post__in', 'post_name__in', 'post_parent__in' );
+               if ( isset( $q['orderby'] ) && in_array( $q['orderby'], $force_asc, true ) ) {
+                       $q['order'] = '';
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 // Order by.
</span><span class="cx" style="display: block; padding: 0 10px">                if ( empty( $q['orderby'] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        /*
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2252,12 +2280,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px">                } elseif ( 'none' == $q['orderby'] ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $orderby = '';
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                } elseif ( $q['orderby'] == 'post__in' && ! empty( $post__in ) ) {
-                       $orderby = "FIELD( {$wpdb->posts}.ID, $post__in )";
-               } elseif ( $q['orderby'] == 'post_parent__in' && ! empty( $post_parent__in ) ) {
-                       $orderby = "FIELD( {$wpdb->posts}.post_parent, $post_parent__in )";
-               } elseif ( $q['orderby'] == 'post_name__in' && ! empty( $post_name__in ) ) {
-                       $orderby = "FIELD( {$wpdb->posts}.post_name, $post_name__in )";
</del><span class="cx" style="display: block; padding: 0 10px">                 } else {
</span><span class="cx" style="display: block; padding: 0 10px">                        $orderby_array = array();
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( is_array( $q['orderby'] ) ) {
</span></span></pre></div>
<a id="trunktestsphpunittestspostqueryphp"></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/post/query.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/post/query.php  2019-01-08 03:28:15 UTC (rev 44451)
+++ trunk/tests/phpunit/tests/post/query.php    2019-01-08 03:32:04 UTC (rev 44452)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -174,6 +174,38 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertSame( $ordered, wp_list_pluck( $q->posts, 'ID' ) );
</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 38034
+        */
+       public function test_orderby_post__in_array() {
+               $posts = self::factory()->post->create_many( 4 );
+
+               $ordered = array( $posts[2], $posts[0], $posts[3] );
+
+               $q = new WP_Query( array(
+                       'post_type' => 'any',
+                       'post__in' => $ordered,
+                       'orderby' => array( 'post__in' => 'ASC' ),
+               ) );
+               $this->assertSame( $ordered, wp_list_pluck( $q->posts, 'ID' ) );
+       }
+
+       /**
+        * @ticket 38034
+        */
+       public function test_orderby_post__in_array_with_implied_order() {
+               $posts = self::factory()->post->create_many( 4 );
+
+               $ordered = array( $posts[2], $posts[0], $posts[3] );
+
+               $q = new WP_Query( array(
+                       'post_type' => 'any',
+                       'post__in' => $ordered,
+                       'orderby' => 'post__in',
+               ) );
+               $this->assertSame( $ordered, wp_list_pluck( $q->posts, 'ID' ) );
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         function test_post__in_attachment_ordering() {
</span><span class="cx" style="display: block; padding: 0 10px">                $post_id    = self::factory()->post->create();
</span><span class="cx" style="display: block; padding: 0 10px">                $att_ids    = array();
</span></span></pre></div>
<a id="trunktestsphpunittestsrestapirestpostscontrollerphp"></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/rest-api/rest-posts-controller.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/rest-api/rest-posts-controller.php      2019-01-08 03:28:15 UTC (rev 44451)
+++ trunk/tests/phpunit/tests/rest-api/rest-posts-controller.php        2019-01-08 03:32:04 UTC (rev 44452)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -291,7 +291,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $data     = $response->get_data();
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( 2, count( $data ) );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $id1, $data[0]['id'] );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->assertPostsOrderedBy( "FIELD( {posts}.ID, $id1,$id3 )" );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $this->assertPostsOrderedBy( "FIELD({posts}.ID,$id1,$id3)" );
</ins><span class="cx" style="display: block; padding: 0 10px">                 // Invalid include should error
</span><span class="cx" style="display: block; padding: 0 10px">                $request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
</span><span class="cx" style="display: block; padding: 0 10px">                $request->set_param( 'include', 'invalid' );
</span></span></pre>
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