从未遇到过这样的事情。运行自定义帖子类型的简单查询，只显示当前用户是作者的帖子类型，并按自定义元字段对其进行排序。

global $current_user;
$user = wp_get_current_user();

$args = array(
    \'post_type\'              => \'order\',
    \'post_status\'            => \'publish\',
    \'author\'                 => $current_user->ID,   
    \'posts_per_page\'         => \'-1\',
    \'meta_query\'             => array(
                                    array(
                                        \'key\' => \'completed\',
                                        \'value\' => \'\'
                                    )
                                ),
   

);


$query = new WP_Query( $args );

这将返回结果。当我加载项时

\'order\'          => \'ASC\',

查询不返回任何结果。对我来说完全没有意义。

仅供参考，以下是整个部分。

// ========== ORDERS QUERY CODE ==========

$orders = \'\';

global $current_user;
$user = wp_get_current_user();

    $args = array(
    \'post_type\'              => \'order\',
    \'post_status\'            => \'publish\',
    \'author\'                 => $current_user->ID,   
    \'posts_per_page\'         => \'-1\',
    \'meta_query\'             => array(
                                    array(
                                        \'key\' => \'completed\',
                                        \'value\' => \'\'
                                    )
                                ),
    \'meta_key\'               => \'delivery_date\',
    \'order\'                  => \'ASC\',
);


$query = new WP_Query( $args );



if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();

        $thePostID = get_the_ID();
        $shortDesc = wordwrap(substr(get_the_content(), 0, 100), 99, \'...\');
        $quantity = get_post_meta( $thePostID, \'order_quantity\', true );
        
        $orders .= \'<div class="order-single order-\'.$thePostID.\'">
                        <div class="row">
                            <div class="col-4">
                                <div class="single-cal">
                                    <div class="month">\'.date_i18n(\'F\', strtotime(get_post_meta( $thePostID, \'delivery_date\', true ))).\'</div>
                                    <div class="day">\'.date_i18n(\'j\', strtotime(get_post_meta( $thePostID, \'delivery_date\', true ))).\'</div>
                                </div>
                            </div>
                            <div class="col-8">
                                <a class="order-customer"  href="\'.get_the_permalink().\'">
                                    \'.get_the_title().\'
                                </a>
                                <div class="order-desc">
                                    <div class="qty"><strong>Quantity:</strong> \'.$quantity.\'</div>
                                    \'.$shortDesc.\'
                                </div>
                            </div>
                        </div>
                    </div>\';
        
    }
} else {
    $orders .= \'No Orders Found.  <a href="/add">Click Here</a> to enter your first Order!\';
}

wp_reset_postdata();

更新01：已安装插件。不知道如何使用它，但看起来这是该调用的SQL。

SELECT wp_y77uhd4169_posts.*
FROM wp_y77uhd4169_posts
INNER JOIN wp_y77uhd4169_postmeta
ON ( wp_y77uhd4169_posts.ID = wp_y77uhd4169_postmeta.post_id )
INNER JOIN wp_y77uhd4169_postmeta AS mt1
ON ( wp_y77uhd4169_posts.ID = mt1.post_id )
WHERE 1=1
AND wp_y77uhd4169_posts.post_name = \'asc\'
AND wp_y77uhd4169_posts.post_author IN (1)
AND ( wp_y77uhd4169_postmeta.meta_key = \'delivery_date\'
AND ( ( mt1.meta_key = \'completed\'
AND mt1.meta_value = \'\' ) ) )
AND wp_y77uhd4169_posts.post_type = \'order\'
AND ((wp_y77uhd4169_posts.post_status = \'publish\'))
GROUP BY wp_y77uhd4169_posts.ID
ORDER BY wp_y77uhd4169_posts.post_date ASC