Issue #3033766 by npralhad, jacklee0410: Notice: Array to string conversion in...

Issue #3033766 by npralhad, jacklee0410: Notice: Array to string conversion in Drupal\Core\Template\AttributeArray->__toString()

templates/navigation/menu--account.html.twig

@@ -36,7 +36,7 @@
           set classes = [
            'nav-link',
             item.in_active_trail ? 'active',
-            item.url.getOption('attributes').class ? item.url.getOption('attributes').class,
+            item.url.getOption('attributes').class ? item.url.getOption('attributes').class | join(' '),
           ]
         %}
         {{ link(item.title, item.url, {'class': classes}) }}

templates/navigation/menu--footer.html.twig

@@ -48,7 +48,7 @@
           set link_classes = [
             'nav-link',
             item.in_active_trail ? 'active',
-            item.url.getOption('attributes').class ? item.url.getOption('attributes').class,
+            item.url.getOption('attributes').class ? item.url.getOption('attributes').class | join(' '),
           ]
         %}
         {{ link(item.title, item.url, {'class': link_classes}) }}

templates/navigation/menu--main.html.twig

@@ -50,7 +50,7 @@
             not menu_level ? 'nav-link',
             item.in_active_trail ? 'active',
             item.below ? 'dropdown-toggle',
-            item.url.getOption('attributes').class ? item.url.getOption('attributes').class,
+            item.url.getOption('attributes').class ? item.url.getOption('attributes').class | join(' '),
           ]
         %}
         {% if item.below %}

templates/navigation/menu-local-task.html.twig

@@ -20,7 +20,7 @@
   set classes = [
     'nav-link',
     is_active ? 'active',
-    item.url.getOption('attributes').class ? item.url.getOption('attributes').class,
+    item.url.getOption('attributes').class ? item.url.getOption('attributes').class | join(' '),
   ]
 %}
 <li{{ attributes.addClass(is_active ? 'active', 'nav-item') }}>{{ link(item.text, item.url, {'class': classes}) }}</li>