wordpresstax_query，其中分类法为空

Question

我使用多个分类查询来获取相关帖子

    $tax_query[] = array(
        'taxonomy' => 'transfer_type',
        'field'    => 'id',
        'terms'     => $page_terms['type_term'],
        'include_children' => false
    );


    $tax_query[] = array(
        'taxonomy' => 'area',
        'field'    => 'id',
        'terms'     => $page_terms['area_term'],
        'include_children' => false
    );

    $args = array(
        'post_type' => 'category_description',
        'tax_query' => $tax_query
    );

$description_post = get_posts($args);

当帖子被标记为transfer_type和区域时没有问题， 但是，当一篇文章仅用其中一个标记时，结果是错误的。

我基本上(在某些情况下)想要排除所有具有“区域”或“transfer_type”的帖子，而只获取那些与其他帖子相遇的帖子。

这可能吗？

Answer 1

弄清楚了......(不知道这是否是最好的，但它仍然是一个解决方案)

如果其中一个分类为空，我会对整个分类术语使用“NOT IN”运算符

        $terms = get_terms("transfer_type");
        foreach($terms as $term){
            $not_in_type[] = $term->term_id; 
        }

        $terms = get_terms("area");
        foreach($terms as $term){
            $not_in_area[] = $term->term_id; 
        }


        $tax_query[] = array(
            'taxonomy'         => 'transfer_type',
            'field'            => 'id',
            'terms'            => $page_terms['type_term'] ? $page_terms['type_term'] : $not_in_type,
            'include_children' => false,
            'operator'         => $page_terms['type_term'] ? 'IN' : 'NOT IN'
        );

        $tax_query[] = array(
            'taxonomy'         => 'area',
            'field'            => 'id',
            'terms'            => $page_terms['area_term'] ? $page_terms['area_term'] : $not_in_area,
            'include_children' => false,
            'operator'         => $page_terms['area_term'] ? 'IN' : 'NOT IN'
        );