Wordpress - 过滤搜索查询以排除 postmeta 值

Question

在我的 wordpress 网站中，我使用pre_get_posts 过滤器来自定义我的网站搜索查询。在函数文件中，我有以下内容。

现在我的问题是，我使用 FieldManager 添加了一个名为 hide_from_search_results 的自定义元字段，该字段现在包含在我的 wp_postmeta 表中，值为 0 或 1 整数。但是，并非所有帖子/页面都会设置此字段。我需要添加条件以不显示任何将此设置为 1 的内容。

首先我加入了wp_posts 和wp_postmeta 表，如下所示：

function cf_search_join( $join ) {
    global $wpdb;

    if ( is_search() && !is_admin() ) {
        $join .=' LEFT JOIN '.$wpdb->postmeta. ' ON '. $wpdb->posts . '.ID = ' . $wpdb->postmeta . '.post_id ';
    }

    return $join;
}
add_filter('posts_join', 'cf_search_join' );

然后我按帖子 ID 对结果进行分组：

function cf_posts_groupby($groupby) {
    global $wpdb;

    if (is_search() && !is_admin()) {
        return $wpdb->posts . '.' . 'ID';
    }

    return $groupby;
}
add_filter( 'posts_groupby', 'cf_posts_groupby' );

使用posts_where 修改搜索查询，例如从结果中排除图片：

function cf_search_where( $where ) {
    global $pagenow, $wpdb;

    if ( is_search() && !is_admin() ) {
        $where = preg_replace(
            "/\(\s*".$wpdb->posts.".post_title\s+LIKE\s*(\'[^\']+\')\s*\)/",
            "(".$wpdb->posts.".post_title LIKE $1) OR (".$wpdb->postmeta.".meta_value LIKE $1)", $where );
        
        $where .= ' AND ' . $wpdb->posts . '.post_mime_type != "image/jpeg"';
    }

    return $where;
}
add_filter( 'posts_where', 'cf_search_where' );

我最后使用pre_get_posts 更改查询以包含某些帖子类型并仅显示已发布：

function cf_posts_query( $query ) {
    if ( is_search() && !is_admin() ) {

        if (isset($_GET['post_types'])) {
            $query->set('post_type', $_GET['post_types']);
        } else {
            $query->set('post_type', ['page']);
        }

        $query->set( 'post_status', array( 'publish', 'inherit' ) );
      
    }

   return $query;
}
add_filter( 'pre_get_posts', 'cf_posts_query' );

我尝试将以下内容添加到我的cf_posts_query

    $query->set( 'meta_query', array(
        array(
          'key' => 'hide_from_search_results',
          'compare' => '!=',
          'value' => 1
        )
      ));

但是得到以下错误：

WordPress database error: [Not unique table/alias: 'wp_postmeta']
SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) LEFT JOIN wp_postmeta ON wp_posts.ID = wp_postmeta.post_id WHERE 1=1 AND wp_posts.ID NOT IN (4440,4436) AND (((wp_posts.post_title LIKE '%coron%') OR (wp_postmeta.meta_value LIKE '%coron%') OR (wp_posts.post_excerpt LIKE '%coron%') OR (wp_posts.post_content LIKE '%coron%'))) AND ( ( wp_postmeta.meta_key = 'hide_from_search_results' AND wp_postmeta.meta_value != '1' ) ) AND wp_posts.post_type = 'page' AND ((wp_posts.post_status = 'publish' OR wp_posts.post_status = 'inherit')) AND wp_posts.post_mime_type != "image/jpeg" GROUP BY wp_posts.ID ORDER BY wp_posts.post_title LIKE '%coron%' DESC, wp_posts.post_date DESC LIMIT 0, 20

WordPress database error: [Not unique table/alias: 'wp_postmeta']
SELECT wp_posts.* FROM wp_posts INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) LEFT JOIN wp_postmeta ON wp_posts.ID = wp_postmeta.post_id WHERE 1=1 AND wp_posts.post_name IN ('search') AND wp_posts.ID NOT IN (4440,4436) AND ( 0 = 1 ) AND ( ( wp_postmeta.meta_key = 'hide_from_search_results' AND wp_postmeta.meta_value != '1' ) ) AND wp_posts.post_type = 'page' AND ((wp_posts.post_status = 'publish' OR wp_posts.post_status = 'inherit')) AND wp_posts.post_mime_type != "image/jpeg" GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC

或者，我尝试在我的 cf_search_where 函数中添加这个

$where .= ' AND (' . $wpdb->postmeta . '.meta_key != "hide_from_search_results") OR (' . $wpdb->postmeta . '.meta_key == "hide_from_search_results" AND ' . $wpdb->postmeta . '.meta_value == 1)';

但是得到：

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '== "hide_from_search_results" AND wp_postmeta.meta_value == "1") AND wp_posts.po' at line 1]
SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts LEFT JOIN wp_postmeta ON wp_posts.ID = wp_postmeta.post_id WHERE 1=1 AND wp_posts.ID NOT IN (4440,4436) AND (((wp_posts.post_title LIKE '%coron%') OR (wp_postmeta.meta_value LIKE '%coron%') OR (wp_posts.post_excerpt LIKE '%coron%') OR (wp_posts.post_content LIKE '%coron%'))) AND wp_posts.post_type = 'page' AND ((wp_posts.post_status = 'publish' OR wp_posts.post_status = 'inherit')) AND (wp_postmeta.meta_key != "hide_from_search_results") OR (wp_postmeta.meta_key == "hide_from_search_results" AND wp_postmeta.meta_value == "1") AND wp_posts.post_mime_type != "image/jpeg" GROUP BY wp_posts.ID ORDER BY wp_posts.post_title LIKE '%coron%' DESC, wp_posts.post_date DESC LIMIT 0, 20

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '== "hide_from_search_results" AND wp_postmeta.meta_value == "1") AND wp_posts.po' at line 3]
SELECT wp_posts.* FROM wp_posts LEFT JOIN wp_postmeta ON wp_posts.ID = wp_postmeta.post_id WHERE 1=1 AND wp_posts.post_name IN ('search') AND wp_posts.ID NOT IN (4440,4436) AND ( 0 = 1 ) AND wp_posts.post_type = 'page' AND ((wp_posts.post_status = 'publish' OR wp_posts.post_status = 'inherit')) AND (wp_postmeta.meta_key != "hide_from_search_results") OR (wp_postmeta.meta_key == "hide_from_search_results" AND wp_postmeta.meta_value == "1") AND wp_posts.post_mime_type != "image/jpeg" GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC

Answer 1

不知道为什么要编写自己的sql 语句和查询。我会尽可能避免编写自己的sql 查询，因为这些自定义sql 查询可能会使您容易受到slq 攻击。在您确实必须编写自己的sql 查询的情况下，请考虑使用$wpdb->prepare。但是，我总是使用wp_query。

也不确定您是否将meta_values 存储为整数或字符串。我假设它们是字符串。

话虽如此，您可以通过多种方式设置meta_query：

例如，如果您为所有 posts 和 pages 设置了此值，您可以尝试这样做：

$query->set( 'meta_query', array(
 array(
   'key' => 'hide_from_search_results',
   'value' => '0'
 )
));

您可以尝试的另一种解决方案（这个解决方案有望解决您的问题）：

$query->set( 'meta_query', array(
 array(
   'key' => 'hide_from_search_results',
   'value'   => array( '1' ),
   'compare' => 'NOT IN'
 )
));

老实说，由于那些自定义的sql 查询，您的问题很难重现，而且您的meta_value 类型并不清楚它是整数还是字符串，因此您可能需要尝试meta_query 的不同组合。如果我的回答没有满足您的需求，那么以下链接将是开始尝试 meta_query 的不同组合的好地方：

meta_query documentation

---

更新
如果您的 meta_value 是一个整数，那么您必须从您的值中删除“引号”。

$query->set( 'meta_query', array(
 array(
   'key' => 'hide_from_search_results',
   'value'   => array( 1 ),
   'compare' => 'NOT IN'
 )
));

或者

$query->set( 'meta_query', array(
 array(
   'key' => 'hide_from_search_results',
   'value'   => 1,
   'compare' => '!=',
   'type'=>'numeric'
 )
));