恐怕这是不可能的(还好吗?)。看到这个轨迹:http : //core.trac.wordpress.org/ticket/18106
同样,在分类管理页面上,帖子计数反映所有帖子类型。(我很确定也有相应的追踪票)
http://core.trac.wordpress.org/ticket/14084
另请参阅此相关文章。
新解决方案
在写完下面的内容后,我发布了一种更好的方法(从某种意义上讲,您可以做更多的事情)是使用get_terms()
通话中提供的过滤器。您可以创建使用get_terms
和(有条件地)添加过滤器以操纵SQL查询(以帖子类型限制)的包装器函数。
该函数采用与相同的参数get_terms($taxonomies, $args)
。$args
采用附加参数,post_types
该参数采用帖子类型的字符串。
但是我不能保证一切都“按预期”进行(我正在考虑增加计数)。仅使用默认的$args
for 似乎可以工作get_terms
。
function wpse57444_get_terms( $taxonomies, $args=array() ){
//Parse $args in case its a query string.
$args = wp_parse_args($args);
if( !empty($args['post_types']) ){
$args['post_types'] = (array) $args['post_types'];
add_filter( 'terms_clauses','wpse_filter_terms_by_cpt',10,3);
function wpse_filter_terms_by_cpt( $pieces, $tax, $args){
global $wpdb;
// Don't use db count
$pieces['fields'] .=", COUNT(*) " ;
//Join extra tables to restrict by post type.
$pieces['join'] .=" INNER JOIN $wpdb->term_relationships AS r ON r.term_taxonomy_id = tt.term_taxonomy_id
INNER JOIN $wpdb->posts AS p ON p.ID = r.object_id ";
// Restrict by post type and Group by term_id for COUNTing.
$post_types_str = implode(',',$args['post_types']);
$pieces['where'].= $wpdb->prepare(" AND p.post_type IN(%s) GROUP BY t.term_id", $post_types_str);
remove_filter( current_filter(), __FUNCTION__ );
return $pieces;
}
} // endif post_types set
return get_terms($taxonomies, $args);
}
用法
$args =array(
'hide_empty' => 0,
'post_types' =>array('country','city'),
);
$terms = wpse57444_get_terms('flag',$args);
原始解决方法
灵感来自上面的票,(经过测试,对我有用)
function wpse57444_filter_terms_by_cpt($taxonomy, $post_types=array() ){
global $wpdb;
$post_types=(array) $post_types;
$key = 'wpse_terms'.md5($taxonomy.serialize($post_types));
$results = wp_cache_get($key);
if ( false === $results ) {
$where =" WHERE 1=1";
if( !empty($post_types) ){
$post_types_str = implode(',',$post_types);
$where.= $wpdb->prepare(" AND p.post_type IN(%s)", $post_types_str);
}
$where .= $wpdb->prepare(" AND tt.taxonomy = %s",$taxonomy);
$query = "
SELECT t.*, COUNT(*)
FROM $wpdb->terms AS t
INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id
INNER JOIN $wpdb->term_relationships AS r ON r.term_taxonomy_id = tt.term_taxonomy_id
INNER JOIN $wpdb->posts AS p ON p.ID = r.object_id
$where
GROUP BY t.term_id";
$results = $wpdb->get_results( $query );
wp_cache_set( $key, $results );
}
return $results;
}
用法
$terms = wpse57444_filter_terms_by_cpt('flag',array('country','city'));
要么
$terms = wpse57444_filter_terms_by_cpt('flag','country');