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<title>[46456] trunk: REST API: Fix error in _fields filtering logic where only one of several requested sibling properties would be included.</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/46456">46456</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/46456","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>kadamwhite</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2019-10-10 17:16:44 +0000 (Thu, 10 Oct 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'>REST API: Fix error in _fields filtering logic where only one of several requested sibling properties would be included.

Props kadamwhite, TimothyBlynJacobs.
Fixes <a href="https://core.trac.wordpress.org/ticket/48266">#48266</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesrestapiphp">trunk/src/wp-includes/rest-api.php</a></li>
<li><a href="#trunktestsphpunittestsrestapiphp">trunk/tests/phpunit/tests/rest-api.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesrestapiphp"></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/rest-api.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/rest-api.php        2019-10-09 22:20:37 UTC (rev 46455)
+++ trunk/src/wp-includes/rest-api.php  2019-10-10 17:16:44 UTC (rev 46456)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -743,8 +743,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $parts = explode( '.', $field );
</span><span class="cx" style="display: block; padding: 0 10px">                $ref   = &$fields_as_keyed;
</span><span class="cx" style="display: block; padding: 0 10px">                while ( count( $parts ) > 1 ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $next         = array_shift( $parts );
-                       $ref[ $next ] = array();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $next = array_shift( $parts );
+                       if ( isset( $ref[ $next ] ) && true === $ref[ $next ] ) {
+                               // Skip any sub-properties if their parent prop is already marked for inclusion.
+                               break 2;
+                       }
+                       $ref[ $next ] = isset( $ref[ $next ] ) ? $ref[ $next ] : array();
</ins><span class="cx" style="display: block; padding: 0 10px">                         $ref          = &$ref[ $next ];
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px">                $last         = array_shift( $parts );
</span></span></pre></div>
<a id="trunktestsphpunittestsrestapiphp"></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.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/rest-api.php    2019-10-09 22:20:37 UTC (rev 46455)
+++ trunk/tests/phpunit/tests/rest-api.php      2019-10-10 17:16:44 UTC (rev 46456)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -561,6 +561,102 @@
</span><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">        /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Ensure that specifying a single top-level key in _fields includes that field and all children.
+        *
+        * @ticket 48266
+        */
+       public function test_rest_filter_response_fields_top_level_key() {
+               $response = new WP_REST_Response();
+
+               $response->set_data(
+                       array(
+                               'meta' => array(
+                                       'key1' => 1,
+                                       'key2' => 2,
+                               ),
+                       )
+               );
+               $request = array(
+                       '_fields' => 'meta',
+               );
+
+               $response = rest_filter_response_fields( $response, null, $request );
+               $this->assertEquals(
+                       array(
+                               'meta' => array(
+                                       'key1' => 1,
+                                       'key2' => 2,
+                               ),
+                       ),
+                       $response->get_data()
+               );
+       }
+
+       /**
+        * Ensure that a top-level key in _fields supersedes any specified children of that field.
+        *
+        * @ticket 48266
+        */
+       public function test_rest_filter_response_fields_child_after_parent() {
+               $response = new WP_REST_Response();
+
+               $response->set_data(
+                       array(
+                               'meta' => array(
+                                       'key1' => 1,
+                                       'key2' => 2,
+                               ),
+                       )
+               );
+               $request = array(
+                       '_fields' => 'meta,meta.key1',
+               );
+
+               $response = rest_filter_response_fields( $response, null, $request );
+               $this->assertEquals(
+                       array(
+                               'meta' => array(
+                                       'key1' => 1,
+                                       'key2' => 2,
+                               ),
+                       ),
+                       $response->get_data()
+               );
+       }
+
+       /**
+        * Ensure that specifying two sibling properties in _fields causes both to be included.
+        *
+        * @ticket 48266
+        */
+       public function test_rest_filter_response_fields_include_all_specified_siblings() {
+               $response = new WP_REST_Response();
+
+               $response->set_data(
+                       array(
+                               'meta' => array(
+                                       'key1' => 1,
+                                       'key2' => 2,
+                               ),
+                       )
+               );
+               $request = array(
+                       '_fields' => 'meta.key1,meta.key2',
+               );
+
+               $response = rest_filter_response_fields( $response, null, $request );
+               $this->assertEquals(
+                       array(
+                               'meta' => array(
+                                       'key1' => 1,
+                                       'key2' => 2,
+                               ),
+                       ),
+                       $response->get_data()
+               );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * @ticket 42094
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        public function test_rest_is_field_included() {
</span></span></pre>
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