如何在自定义查询中根据最大变化价格对 WooCommerce 可变产品进行排序

Question

我正在尝试从最大变化价格中对 WooCommerce 可变产品进行排序（我的网站包含简单和可变产品）。

下面我的自定义查询是按价格对产品进行排序，但问题是它从可变产品中获取最小变化价格。有什么方法可以按最大变化价格对它们进行排序吗？

function products_load_more() { 
    $size = $_POST['size'];
    $count = $_POST['count'];
    $strength = $_POST['strength'];
    $country = $_POST['country'];
    $taxonomy_id = $_POST['taxonomy_id'];
    $category = $_POST['category'];
    $amount1 = (int) $_POST['amount1'];
    $amount2 = (int) $_POST['amount2'];
    $sorting = $_POST['sorting'];
    $range_slider_array = array(0=>0,1=>100,2=>200,3=>300,4=>400,5=>500,6=>600,7=>700,8=>800,9=>900,10=>1000,11=>1500,12=>2000,13=>2500,14=>3000,15=>3500,16=>4000,17=>4500,18=>5000);
    
    if($sorting == "h_t_l"){
        $order = "DESC";
    }
    else{
        $order = "ASC";
    } 
    $args = array(
        'post_type' => 'product',
        'posts_per_page' => 8,
        'orderby' => 'date',
        'order' => 'DESC',
        'paged' => $_POST['paged'],
        'tax_query' => array( array(
            'taxonomy' => 'product_cat',
            'field' => 'term_id',
            'terms' => $taxonomy_id
        ) )
    );  
    
    // price
    if(isset($_POST['amount1']) && isset($_POST['amount2'])){
        if(trim($amount1) != "" && trim($amount2) != ""){
            if($range_slider_array[$amount2] == 5000){
                $args['meta_query'][] = array(
                    'key' => '_price',
                    'value' => $range_slider_array[$amount1],
                    'compare' => '>=',
                    'type' => 'NUMERIC'  
                );
            } 
            else{
                $args['meta_query'][] = array(
                    'key' => '_price',
                    'value' => array($range_slider_array[$amount1], $range_slider_array[$amount2]),
                    'compare' => 'BETWEEN',
                    'type' => 'NUMERIC'
                );
            }
        }
    }
    
    $args['orderby'] = 'meta_value_num';
    $args['order'] = 'DESC';
    $args['meta_key'] = '_price';
    
    $ajaxposts = new WP_Query($args);
    $count = $ajaxposts->found_posts;
    $response = '';

    if($ajaxposts->have_posts()) {
        while($ajaxposts->have_posts()) : $ajaxposts->the_post();
            include get_stylesheet_directory()."/inc/product.php";
        endwhile;
    } else {
        $response = 0;
    }
    echo $response;
    exit;
}
add_action('wp_ajax_products_load_more', 'products_load_more');
add_action('wp_ajax_nopriv_products_load_more', 'products_load_more');

Answer 1

    function sort_products_by_max_variation_price($query) {
    if (is_admin() || !$query->is_main_query() || !is_shop()) {
        return;
    }

    global $wpdb;

    $query->set('meta_query', array(
        'relation' => 'OR',
        array(
            'key' => '_min_variation_price',
            'compare' => 'EXISTS',
        ),
        array(
            'key' => '_price',
            'compare' => 'EXISTS',
        ),
    ));

    $query->set('orderby', 'meta_value_num');
    $query->set('order', 'DESC');

    $query->set('meta_key', 'max_price');

    // Add a join clause to include maximum variation prices
    add_filter('posts_join', function($join) use ($wpdb) {
        $join .= " LEFT JOIN (
            SELECT post_parent, MAX(meta_value+0) as max_price
            FROM {$wpdb->postmeta}
            WHERE meta_key = '_price'
            GROUP BY post_parent
        ) as max_price_table ON {$wpdb->posts}.ID = max_price_table.post_parent";
        return $join;
    });

    // Add a select clause to include maximum variation prices in the query
    add_filter('posts_fields', function($fields) use ($wpdb) {
        $fields .= ", max_price_table.max_price as max_price";
        return $fields;
    });

    // Add an orderby clause to sort by maximum variation prices
    add_filter('posts_orderby', function($orderby) use ($wpdb) {
        $orderby = "max_price DESC, {$wpdb->posts}.post_date DESC";
        return $orderby;
    });
} 
add_action('pre_get_posts', 'sort_products_by_max_variation_price');