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<title>[56426] branches/6.3: Editor: Fix error handling of converting classic to block menus.</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/56426">56426</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/56426","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>audrasjb</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2023-08-22 20:57:47 +0000 (Tue, 22 Aug 2023)</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'>Editor: Fix error handling of converting classic to block menus.

Fixes the error handling for when `WP_Classic_To_Block_Menu_Converter::convert()` returns an instance of `WP_Error`. 
`WP_Navigation_Fallback::create_classic_menu_fallback()` now checks for `is_wp_error()` and if `true`, returns the error. And the `@return` type is updated to 
`string|WP_Error`.

Also includes a fix in the return type in `WP_Classic_To_Block_Menu_Converter::convert()` to return an empty string instead of an array instead, i.e. when bailing 
out for no menu items returned by `wp_get_nav_menu_items()`. The return type is clearly documented as a string.

Follow-up to <a href="https://core.trac.wordpress.org/changeset/56052">[56052]</a>.

Props dlh, get_dave, antonvlasenko, hellofromTonya.
Reviewed by azaozz, audrasjb.
Merges <a href="https://core.trac.wordpress.org/changeset/56422">[56422]</a> to the 6.3 branch.
Fixes <a href="https://core.trac.wordpress.org/ticket/58823">#58823</a>.

 --Cette ligne, et les suivantes ci-dessous, seront 
ignorees--

_M   .
M    src/wp-includes/class-wp-classic-to-block-menu-converter.php
M    src/wp-includes/class-wp-navigation-fallback.php
M    tests/phpunit/tests/editor/classic-to-block-menu-converter.php</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches63srcwpincludesclasswpclassictoblockmenuconverterphp">branches/6.3/src/wp-includes/class-wp-classic-to-block-menu-converter.php</a></li>
<li><a href="#branches63srcwpincludesclasswpnavigationfallbackphp">branches/6.3/src/wp-includes/class-wp-navigation-fallback.php</a></li>
<li><a href="#branches63testsphpunittestseditorclassictoblockmenuconverterphp">branches/6.3/tests/phpunit/tests/editor/classic-to-block-menu-converter.php</a></li>
</ul>

<h3>Property Changed</h3>
<ul>
<li><a href="#branches63">branches/6.3/</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/6.3
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/6.3 2023-08-22 12:45:12 UTC (rev 56425)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/6.3  2023-08-22 20:57:47 UTC (rev 56426)
</ins><a id="branches63"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/6.3</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/5.0:43681-43682,43684-43688,43719-43720,43723,43726-43727,43729-43731,43734-43744,43747,43751-43754,43758,43760-43765,43767-43770,43772,43774-43781,43783,43785,43790-43806,43808-43821,43825,43828,43830-43834,43836-43843,43846-43863,43867-43889,43891-43894,43897-43905,43908-43909,43911-43929,43931-43942,43946-43947,43949-43956,43959-43964,43967-43969,43988,43994,44014,44017,44047,44183,44185,44187-44206,44208-44213,44231-44232,44235,44248,44284,44287-44288
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.5:49373-49379,49381
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.8:51889
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:56268,56272,56277,56279,56282,56284,56287,56290-56292,56296,56298,56300,56302,56309,56311,56315,56320,56327,56329,56332,56335,56337,56339,56341,56350,56358,56365,56417
</del><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:56268,56272,56277,56279,56282,56284,56287,56290-56292,56296,56298,56300,56302,56309,56311,56315,56320,56327,56329,56332,56335,56337,56339,56341,56350,56358,56365,56417,56422
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches63srcwpincludesclasswpclassictoblockmenuconverterphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/6.3/src/wp-includes/class-wp-classic-to-block-menu-converter.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/6.3/src/wp-includes/class-wp-classic-to-block-menu-converter.php 2023-08-22 12:45:12 UTC (rev 56425)
+++ branches/6.3/src/wp-includes/class-wp-classic-to-block-menu-converter.php   2023-08-22 20:57:47 UTC (rev 56426)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -20,7 +20,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 6.3.0
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @param WP_Term $menu The Menu term object of the menu to convert.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         * @return string the serialized and normalized parsed blocks.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+  * @return string|WP_Error The serialized and normalized parsed blocks on success,
+        *                         an empty string when there are no menus to convert,
+        *                         or WP_Error on invalid menu.
</ins><span class="cx" style="display: block; padding: 0 10px">          */
</span><span class="cx" style="display: block; padding: 0 10px">        public static function convert( $menu ) {
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -34,7 +36,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $menu_items = wp_get_nav_menu_items( $menu->term_id, array( 'update_post_term_cache' => false ) );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                if ( empty( $menu_items ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        return array();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 return '';
</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">                // Set up the $menu_item variables.
</span></span></pre></div>
<a id="branches63srcwpincludesclasswpnavigationfallbackphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/6.3/src/wp-includes/class-wp-navigation-fallback.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/6.3/src/wp-includes/class-wp-navigation-fallback.php     2023-08-22 12:45:12 UTC (rev 56425)
+++ branches/6.3/src/wp-includes/class-wp-navigation-fallback.php       2023-08-22 20:57:47 UTC (rev 56426)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -105,6 +105,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                // If there is a classic menu then convert it to blocks.
</span><span class="cx" style="display: block; padding: 0 10px">                $classic_nav_menu_blocks = WP_Classic_To_Block_Menu_Converter::convert( $classic_nav_menu );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                if ( is_wp_error( $classic_nav_menu_blocks ) ) {
+                       return $classic_nav_menu_blocks;
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 if ( empty( $classic_nav_menu_blocks ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        return new WP_Error( 'cannot_convert_classic_menu', __( 'Unable to convert Classic Menu to blocks.' ) );
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span></span></pre></div>
<a id="branches63testsphpunittestseditorclassictoblockmenuconverterphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/6.3/tests/phpunit/tests/editor/classic-to-block-menu-converter.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/6.3/tests/phpunit/tests/editor/classic-to-block-menu-converter.php       2023-08-22 12:45:12 UTC (rev 56425)
+++ branches/6.3/tests/phpunit/tests/editor/classic-to-block-menu-converter.php 2023-08-22 20:57:47 UTC (rev 56426)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -205,7 +205,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @ticket 58557
</span><span class="cx" style="display: block; padding: 0 10px">         * @covers WP_Classic_To_Block_Menu_Converter::convert
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        public function test_returns_empty_array_for_menus_with_no_items() {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ public function test_returns_empty_string_for_menus_with_no_items() {
</ins><span class="cx" style="display: block; padding: 0 10px">                 $menu_id = wp_create_nav_menu( 'Empty Menu' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $classic_nav_menu = wp_get_nav_menu_object( $menu_id );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -212,10 +212,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $blocks = WP_Classic_To_Block_Menu_Converter::convert( $classic_nav_menu );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->assertEmpty( $blocks, 'Result should be empty.' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $this->assertSame( '', $blocks, 'Result should be empty string.' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $this->assertIsArray( $blocks, 'Result should be empty array.' );
-
</del><span class="cx" style="display: block; padding: 0 10px">                 wp_delete_nav_menu( $menu_id );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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