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I am developing a theme and trying to send custom vars to a twig menu template (since it pulls data from config) and have a loop to add variables in preprocess:

foreach($attributes as $attribute => $values){ $variables[$element . '_attributes']->SetAttribute( $attribute, $values ); // Also tried: $variables[$element]['#attributes'][$attribute][] = $values; }

This function passes data to the template $variables as confirmed by kint, but SetAttribute returns a protected class property instead of the render array, while pushing to ['#attributes'] returns the attribute keys correctly but the arrays are empty...

How can I render the Attribute array in a menu?!

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The issue was accessing variables inside of the menu {%macro%}... to pass variables to a menu you need to pass $variables['name'] to the menu before the macro and add a parameter to the macro, i.e.:

// preprocess $variables['custom_attributes'] = array( 'class' => ['myclass'] ); 
//template.html.twig {{ menus.menu_links(items, attributes, 0, custom_attributes) }} {% macro menu_links(items, attributes, menu_level, twigvars) %} {{dump(twigvars.class)}}
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