問題描述
我建立了一個自定義的帖子型別,並附加了一些自定義欄位。現在,我希望作者可以在自定義帖子列表螢幕 (在管理員後端) 中執行的搜尋,也可以在後設資料檔案上執行,而不僅僅是像往常一樣檢視標題和內容。
我在哪裡可以結束通話哪些程式碼?
示例影像
斯特凡諾
最佳解決方案
我解決了透過在 postmeta 表上新增 join 來更改 where 子句來過濾查詢。過濾 WHERE 子句的提示 (通常需要正規表示式搜尋和替換) 是 here on codex:
add_filter('posts_join', 'segnalazioni_search_join' );
function segnalazioni_search_join ($join){
global $pagenow, $wpdb;
// I want the filter only when performing a search on edit page of Custom Post Type named "segnalazioni"
if ( is_admin() && $pagenow=='edit.php' && $_GET['post_type']=='segnalazioni' && $_GET['s'] != '') {
$join .='LEFT JOIN '.$wpdb->postmeta. ' ON '. $wpdb->posts . '.ID = ' . $wpdb->postmeta . '.post_id ';
}
return $join;
}
add_filter( 'posts_where', 'segnalazioni_search_where' );
function segnalazioni_search_where( $where ){
global $pagenow, $wpdb;
// I want the filter only when performing a search on edit page of Custom Post Type named "segnalazioni"
if ( is_admin() && $pagenow=='edit.php' && $_GET['post_type']=='segnalazioni' && $_GET['s'] != '') {
$where = preg_replace(
"/(s*".$wpdb->posts.".post_titles+LIKEs*('[^']+')s*)/",
"(".$wpdb->posts.".post_title LIKE $1) OR (".$wpdb->postmeta.".meta_value LIKE $1)", $where );
}
return $where;
}
次佳解決方案
這將工作,
function custom_search_query( $query ) {
$custom_fields = array(
// put all the meta fields you want to search for here
"rg_first_name",
"rg_1job_designation"
);
$searchterm = $query->query_vars['s'];
// we have to remove the "s" parameter from the query, because it will prevent the posts from being found
$query->query_vars['s'] = "";
if ($searchterm != "") {
$meta_query = array('relation' => 'OR');
foreach($custom_fields as $cf) {
array_push($meta_query, array(
'key' => $cf,
'value' => $searchterm,
'compare' => 'LIKE'
));
}
$query->set("meta_query", $meta_query);
};
}
add_filter( "pre_get_posts", "custom_search_query");
第三種解決方案
斯特凡諾的答案是偉大的,但它缺乏一個獨特的條款:
function segnalazioni_search_distinct( $where ){
global $pagenow, $wpdb;
if ( is_admin() && $pagenow=='edit.php' && $_GET['post_type']=='segnalazioni' && $_GET['s'] != '') {
return "DISTINCT";
}
return $where;
}
add_filter( 'posts_distinct', 'segnalazioni_search_distinct' );
新增上面的程式碼更新它,它將不會重複。
參考文獻
注:本文內容整合自 Google/Baidu/Bing 輔助翻譯的英文資料結果。如果您對結果不滿意,可以加入我們改善翻譯效果:薇曉朵技術論壇。
