我想做什么
为一篇文章分配多个类别，使其出现在每个类别模板中，而URL中没有一个主类别。
为一篇文章选择多个类别时，WP的默认行为是将文章分配给ID最低的类别。
例如：如果；苹果公司；类别的ID为6和；桃子“；类别的ID为4。如果帖子被添加到Apple类别中，那么永久链接将是/苹果/帖子标题（相当永久链接）。如果将帖子添加到Apple和Peach类别，则永久链接将是/Peach/帖子标题。
约束必须出现在permalink中，如果添加了其他类别，Permalinks将无法更改。首先，我创建了一个名为；跨类别；。这将允许我创建与主类别同名的第二组类别。这样我就可以选择苹果作为分类，桃子作为；跨类别"E；
function crosspromote_taxonomies() {
$crosscatlabels = array(
\'name\' => _x( \'Cross Promote Categories\', \'taxonomy general name\' ),
\'singular_name\' => _x( \'Cross Promote Category\', \'taxonomy singular name\' ),
\'search_items\' => __( \'Search Cross Promote Categories\' ),
\'popular_items\' => __( \'Popular Cross Promote Categories\' ),
\'all_items\' => __( \'All Cross Promote Categories\' ),
\'parent_item\' => __( \'Parent Cross Promote Category\' ),
\'parent_item_colon\' => __( \'Parent Cross Promote Category:\' ),
\'edit_item\' => __( \'Edit Cross Promote Category\' ),
\'update_item\' => __( \'Update Cross Promote Category\' ),
\'add_new_item\' => __( \'Add New Cross Promote Category\' ),
\'new_item_name\' => __( \'New Cross Promote Category\' ),
);
register_taxonomy(
\'crosscategory\',
array(
\'post\'
),
array(
\'hierarchical\' => true,
\'labels\' => $crosscatlabels,
\'show_ui\' => true,
\'query_var\' => true,
\'rewrite\' => false,
)
);
}
现在我需要创建一个只在类别上运行的过滤器。php模板。如果我导航到/苹果/我需要查看苹果类别中的所有帖子，以及其他类别中的任何帖子，这些帖子在苹果也有交叉推广。
function cross_category_filter($query){
// only run this filter on the actual category page
if ( is_admin() || $query->is_home() || !$query->is_main_query() || $query->is_singular || !$query->is_category )
return;
$category_name = $query->query_vars[\'category_name\'];
// Required to include posts from category-x used for cross-promoting posts in other categories without changing the URL
$query->set(
\'tax_query\',
array(
\'relation\' => \'OR\',
array(
\'taxonomy\' => \'crosscategory\',
\'field\' => \'slug\',
\'terms\' => array($category_name),
\'operator\' => \'IN\'
)
)
);
}
add_action( \'pre_get_posts\', \'cross_category_filter\', 1 );
The Problem
这似乎根本不起作用。当我导航到/apple时，我要么看到标签页（而不是类别模板——不知道为什么），要么根本看不到帖子。标题。php，侧栏。php和页脚。php会加载，但帖子应该是空的，就像has\\u posts（）没有帖子一样。
$查询对象的输出如下所示：
WP_Query Object
(
[query_vars] => Array
(
[category_name] => apple
[error] =>
[m] => 0
[p] => 0
[post_parent] =>
[subpost] =>
[subpost_id] =>
[attachment] =>
[attachment_id] => 0
[name] =>
[static] =>
[pagename] =>
[page_id] => 0
[second] =>
[minute] =>
[hour] =>
[day] => 0
[monthnum] => 0
[year] => 0
[w] => 0
[tag] =>
[cat] =>
[tag_id] =>
[author_name] =>
[feed] =>
[tb] =>
[paged] => 0
[comments_popup] =>
[meta_key] =>
[meta_value] =>
[preview] =>
[s] =>
[sentence] =>
[fields] =>
[menu_order] =>
[category__in] => Array
(
)
[category__not_in] => Array
(
)
[category__and] => Array
(
)
[post__in] => Array
(
)
[post__not_in] =>
[tag__in] => Array
(
)
[tag__not_in] => Array
(
)
[tag__and] => Array
(
)
[tag_slug__in] => Array
(
)
[tag_slug__and] => Array
(
)
[tax_query] => Array
(
[relation] => OR
[0] => Array
(
[taxonomy] => crosscategory
[field] => slug
[terms] => Array
(
[0] => apple
)
[operator] => IN
)
)
)
[tax_query] => WP_Tax_Query Object
(
[queries] => Array
(
[0] => Array
(
[taxonomy] => category
[terms] => Array
(
[0] => apple
)
[include_children] => 1
[field] => slug
[operator] => IN
)
)
[relation] => AND
)
[meta_query] =>
[post_count] => 0
[current_post] => -1
[in_the_loop] =>
[comment_count] => 0
[current_comment] => -1
[found_posts] => 0
[max_num_pages] => 0
[max_num_comment_pages] => 0
[is_single] =>
[is_preview] =>
[is_page] =>
[is_archive] => 1
[is_date] =>
[is_year] =>
[is_month] =>
[is_day] =>
[is_time] =>
[is_author] =>
[is_category] => 1
[is_tag] =>
[is_tax] =>
[is_search] =>
[is_feed] =>
[is_comment_feed] =>
[is_trackback] =>
[is_home] =>
[is_404] =>
[is_comments_popup] =>
[is_paged] =>
[is_admin] =>
[is_attachment] =>
[is_singular] =>
[is_robots] =>
[is_posts_page] =>
[is_post_type_archive] =>
[query_vars_hash] => 47f5cb8591c9e310161e42fa4bffbf43
[query_vars_changed] =>
[thumbnails_cached] =>
[query] => Array
(
[category_name] => apple
)
)
我正在使用pre\\u get\\u posts来减少查询的数量，并以正确的方式进行查询。
它应该可以找到苹果类别中的所有帖子，以及苹果跨类别中的所有帖子。我假设即使跨类别Apple中没有帖子，它也应该在Apple类别中找到帖子。
这两件事都没有发生，我在这一点上被难住了。
