Question

我正在尝试使用WP_Query和meta_query参数查询帖子：

$args = array(
    'post_type' => 'produkty',
    'meta_query' => array(
            'relation' => 'AND',
            array(
                    'key' => 'produkt_aktywny',
                    'value' => '1',
                    'compare' => '='),
            array(
                    'key' => 'produkt_dostepnosc',
                    'value' => '1',
                    'compare' => '=')
            )
);
$query = new WP_Query( $args );

我应该添加什么才能通过另外两个键（'produkt_kategoria'和'produkt_cena'）订购结果？ WP Codex中没有任何关于它的内容，但是：

"Do you know how to sort the query if the meta_value is an array? Write it here :)"

据此，我认为可以按多个元值进行排序。

Answer 1

我想显示自定义帖子类型的帖子。通过自定义字段对其进行排序，并添加一个参数，其他自定义字段是特定值，以仅显示一系列帖子。

例如。选择custom_posts，其中custom_field_a = xxxx，并按custom_field_b

排序

我花了一段时间才弄清楚，在搜索时，我一直在这个帖子上磕磕绊绊。因此，对于具有相同问题的所有人来说，这里是最终完成它的（简化）代码。

        $args = array(
            'post_type' => 'my_custom_post_type',
            'meta_key' => 'custom_field_b',
            'orderby' => 'meta_value_num',
            'order' => 'DESC',
            'meta_query' => array(
                    array(
                        'key' => 'custom_field_a',
                        'value' => get_post_meta(get_the_ID(),'other_field',true),
                        'compare' => '='
                    )                   

                ),

        ); 
        $loop2 = new WP_Query($args);

你看到这是一个循环循环，因此价值是动态的。当然，这也可能是硬编码的。

希望它有所帮助！

Answer 2

我相信你必须在主$ arg数组中使用'meta_key'。您可以通过该元值进行排序，但我认为没有内置的方式来按2个元值排序。您可以按第二个字段（此处为标题）排序，而不是第二个元值字段（据我所知）。

$args = array(
    'post_type' => 'produkty',
    'meta_key' => 'produkt_kategoria',
    'orderby' => 'meta_value title',
    'meta_query' => array(
            'relation' => 'AND',
            array(
                    'key' => 'produkt_aktywny',
                    'value' => '1',
                    'compare' => '='),
            array(
                    'key' => 'produkt_dostepnosc',
                    'value' => '1',
                    'compare' => '=')
            )
);

您可能需要编写一些SQL。向下滚动此页面：http://wpquestions.com/question/show/id/1916

这也可能有助于： https://wordpress.stackexchange.com/questions/10941/how-do-you-use-orderby-with-meta-query-in-wordpress-3-1

Answer 3

<h3>Doing request</h3>



    <?php
        $query = new WP_Query($args);
        unset($GLOBALS['wp_query']);
        $GLOBALS['wp_query'] = $query;
        ?>

<br />
<br />
<h3>Request done but without sorting, all we need from that request is difficult mysql query $query->request. Next lets get this,modificate and do again</h3>
Principle is simple: explode and add mysql string which is needed<br />

    <?php
//****************************************************************************************
    /* THIS IS REQUEST WHICH I WRITE BY HANDS TO ATCHIVE THAT I NEED. VERY USEFULL TO DO THIS BEFO PROGRAMMING!
     * 
     * SELECT wp_posts.ID FROM wp_posts 
     * INNER JOIN wp_postmeta ON (wp_posts.ID = wp_postmeta.post_id) 
     * INNER JOIN wp_postmeta featured ON (wp_posts.ID = featured.post_id) 
     * WHERE 1=1 
     * AND wp_posts.post_type = 'car' 
     * AND (wp_posts.post_status = 'publish') 
     * AND ( (wp_postmeta.meta_key = 'car_year' 
     * AND CAST(wp_postmeta.meta_value AS SIGNED) BETWEEN '1900' AND '2013') ) //DO NOT LOOK AT THIS, EXAMPLE
     * AND ( (featured.meta_key = 'car_is_featured') ) 
     * GROUP BY wp_posts.ID 
     * ORDER BY featured.meta_value ASC, wp_posts.post_modified_gmt DESC LIMIT 0, 20 
     */
//step 1
    $request = str_replace("SQL_CALC_FOUND_ROWS", "", $query->request); //remove unnecessary code
//step 2 - explode to insert mysql code for featured cars
    $tmp_request_array1 = explode('WHERE 1=1', $request);
    $tmp_request_array1[0].=" INNER JOIN $wpdb->postmeta featured ON ($wpdb->posts.ID = featured.post_id) ";
    $request = $tmp_request_array1[0] . " WHERE 1=1 " . $tmp_request_array1[1]; //assemble request again
//step 3 - explode assembled request to order by meta values
    $tmp_request_array1 = explode('ORDER BY', $request);
    $tmp_request_array2 = explode($order, $tmp_request_array1[1]);
    if ($orderby == 'post_modified_gmt') {
        $request = $tmp_request_array1[0] . ' ORDER BY ' . "featured.meta_value DESC, $wpdb->posts.post_modified_gmt $order" . $tmp_request_array2[1];
    } else {
        $request = $tmp_request_array1[0] . ' ORDER BY ' . "featured.meta_value DESC, $wpdb->postmeta.meta_value $order" . $tmp_request_array2[1];
    }
//step 4 - explode assembled request again to say that featured.meta_key is  =  'car_is_featured'
    $tmp_request_array1 = explode('GROUP BY', $request);
    $request = $tmp_request_array1[0] . " AND ( (featured.meta_key = 'car_is_featured') ) " . " GROUP BY " . $tmp_request_array1[1];
//**********************************************************
//step 5 - DO OUR NEW MYSQL REQUEST, AND GET CARS ORDER WE NEED
    $request_result = array();
    $tmp = $wpdb->get_results($request, ARRAY_N);
    foreach ($tmp as $value) {
        $request_result[] = $value[0];
    }
//***

    ?>

<br />
<br />

完整文章read here

WP_Query - 按多个元值过滤，并按其他元值排序

3 个答案: