如何在WP_Query中获得“出售”Woocommerce变量产品

Question

My variable products does not display on On Sale Category, just the simple products. I tried several methods but I did not succeed. How can resolve that?

<?php

$on_sale = array(
    'post_type'      => 'product',
    'posts_per_page' => get_theme_mod('products_onsell_number_of_products',8),
    'tax_query' => array(
        array(
            'taxonomy' => 'product_visibility',
            'field' => 'name',
            'terms' => 'exclude-from-catalog',
            'operator'  =>  'NOT IN'
        )
    ),
    'meta_query'     => array(
        'relation' => 'OR',
        array( // Simple products type
            'key'           => '_sale_price',
            'value'         => 0,
            'compare'       => '>',
            'type'          => 'numeric'
        ),
        array( // Variable products type
            'key'           => '_min_variation_sale_price',
            'value'         => 0,
            'compare'       => '>',
            'type'          => 'numeric'
        ),

    )
);

$query = new WP_Query($on_sale);
if($query->have_posts()) { while($query->have_posts()) { $query->the_post();