默认情况下未在产品变体中选择 WooCommerce 属性

Question

当我在 Woocommerce 中为我的可变产品创建 2 个属性时，几乎所有东西都可以正常工作。 只有可变产品没有选择默认值。 （见图片） 我不明白如何让默认属性附加到我的可变产品名称上。有人有线索吗？ 数据是通过 Mariadb 查询选择的

        update_post_meta( $post_id, '_manage_stock', 'no');
    $parent_id = $post_id;
    $variation = array(
        'post_title'   =>  $descriptionnlstrip,
        'post_content' =>  $descriptionfull,
        'post_status'  => 'publish',
        'post_parent'  => $parent_id,
        'post_type'    => 'product_variation',
    );



    $sql2 = "SELECT DISTINCT `$col5`, `$col3` from `$exporttabel` WHERE `$col37`LIKE '$descriptionnlstrip%' ORDER BY `$col5`+0";
    $result2 = $conn->query($sql2);
    if ($result2->num_rows > 0) {
        $count2++;
        while($row2 = $result2->fetch_assoc()) {

            wp_set_object_terms( $parent_id, $row2["$col5"], 'pa_size', true );
            wp_set_object_terms( $parent_id, $row2["$col3"], 'pa_color', true );

            $thedata = Array(
                'pa_size' => Array(
                    'name'=>'pa_size',
                    'value'=>$row2["$col5"],
                    'postion'      => $count2,
                    'is_visible'   => '1',
                    'is_variation' => '1',
                    'is_taxonomy'  => '1',
                ),
                'pa_color' => Array(
                    'name'=>'pa_color',
                    'value'=>$row2["$col3"],
                    'postion'      => $count2,
                    'is_visible'   => '1',
                    'is_variation' => '1',
                    'is_taxonomy'  => '1',
                )
            );

            update_post_meta($parent_id,'_product_attributes',$thedata);

        }
    }


               $variation_id = wp_insert_post( $variation );
            update_post_meta( $variation_id, '_regular_price', $sellingprice );
            update_post_meta( $variation_id, '_price', $sellingprice );
            update_post_meta( $variation_id, '_sale_price', "" );
            update_post_meta( $variation_id, 'attribute_' . 'size', $size );
            update_post_meta( $variation_id, 'attribute_' . 'color', $color );
            update_post_meta( $variation_id, '_manage_stock', 'yes');
            update_post_meta( $variation_id, "_stock",  $availstock);
            update_post_meta( $variation_id, '_short_description',  $descriptionfull);
            update_post_meta( $variation_id, '_variation_description', $quality);
            update_post_meta( $variation_id, '_visibility', 'visible' );
            update_post_meta( $variation_id, '_stock_status', 'instock');
            update_post_meta( $variation_id, 'total_sales', '0');
            update_post_meta( $variation_id, '_downloadable', 'no');
            update_post_meta( $variation_id, '_virtual', 'no');
            update_post_meta( $variation_id, '_purchase_note', "bedankt voor de koop" );
            update_post_meta( $variation_id, '_featured', "no" );
            update_post_meta( $variation_id, '_weight', $weightinkg );
            update_post_meta( $variation_id, '_length', $length );
            update_post_meta( $variation_id, '_width', $width );
            update_post_meta( $variation_id, '_height', $height );
            update_post_meta( $variation_id, '_sku', $productcode);
            update_post_meta( $variation_id, '_product_attributes', array());
            update_post_meta( $variation_id, '_sale_price_dates_from', "" );
            update_post_meta( $variation_id, '_sale_price_dates_to', "" );
            update_post_meta( $variation_id, '_sold_individually', "" );
            update_post_meta( $variation_id, '_backorders', "no" );
            WC_Product_Variable::sync( $parent_id );

我尽可能地尝试了。尝试修复是 2 天。 试图将字段更改为 slug 或名称，我尝试了 pa_size 或 pa_color