我有一个带有人员类型分类法的人员职位类型（例如“Staff”）。在Person Type Term Archive页面上，我想按“排序名称”自定义字段排序。为此，我使用pre_get_posts 电话：

<?php
function my_query_tweaks( $query ) {

    // stop immediately if we\'re in the admin or not working with the main query
    if( is_admin() || !$query->is_main_query() )
        return;

    // order people by sortname
    if( is_post_type_archive( \'ciswa_people\' ) || is_tax( \'ciswa_person_type\' ) ) {
        $query->set( \'meta_key\', \'cis_sort_name\' );
        $query->set( \'orderby\', \'meta_value\' );
        $query->set( \'order\', \'ASC\' );
    }

}
add_action( \'pre_get_posts\', \'my_query_tweaks\' );

然而，当我这样做时，术语归档页不会返回任何结果！注释掉meta_key line显示了正确的帖子，但当然是无序的。

当我查看WordPress正在生成的查询时，我认为问题在于WordPress也试图基于meta\\u键查询帖子，而不仅仅是按它排序。从…起$wp_query 在相关的空分类术语归档页面上：

["tax_query"]=>
  object(WP_Tax_Query)#343 (2) {
    ["queries"]=>
    array(1) {
      [0]=>
      array(5) {
        ["taxonomy"]=>
        string(17) "ciswa_person_type"
        ["terms"]=>
        array(1) {
          [0]=>
          string(5) "staff"
        }
        ["include_children"]=>
        bool(true)
        ["field"]=>
        string(4) "slug"
        ["operator"]=>
        string(2) "IN"
      }
    }
    ["relation"]=>
    string(3) "AND"
  }
  ["meta_query"]=>
  object(WP_Meta_Query)#344 (2) {
    ["queries"]=>
    array(1) {
      [0]=>
      array(1) {
        ["key"]=>
        string(13) "cis_sort_name"
      }
    }
    ["relation"]=>
    string(3) "AND"
  }

。。。和

["request"]=>
  string(498) "SELECT SQL_CALC_FOUND_ROWS  fi_posts.ID FROM fi_posts  INNER JOIN fi_term_relationships ON (fi_posts.ID = fi_term_relationships.object_id) INNER JOIN fi_postmeta ON (fi_posts.ID = fi_postmeta.post_id) WHERE 1=1  AND ( fi_term_relationships.term_taxonomy_id IN (6,10) ) AND fi_posts.post_type = \'ciswa_people\' AND (fi_posts.post_status = \'publish\' OR fi_posts.post_status = \'private\') AND (fi_postmeta.meta_key = \'cis_sort_name\' ) GROUP BY fi_posts.ID ORDER BY fi_postmeta.meta_value ASC LIMIT 0, 10"

function wpse105899_sort_posts_by_cis_sort_name( $a, $b ) {
    $a_cis_sort_name = get_post_meta( $a->ID, \'cis_sort_name\', true );
    $b_cis_sort_name = get_post_meta( $b->ID, \'cis_sort_name\', true );

    if ( $a_cis_sort_name === $b_cis_sort_name ) {
        return 0;
    } else if ( $a_cis_sort_name > $b_cis_sort_name ) {
        return 1;
    } else {
        return -1;
    }
}

usort( $query->posts, \'wpse105899_sort_posts_by_cis_sort_name\' );

function wpse105899_sort_posts_by_cis_sort_name( $a, $b ) {
    $a_cis_sort_name = get_post_meta( $a->ID, \'cis_sort_name\', true );
    $b_cis_sort_name = get_post_meta( $b->ID, \'cis_sort_name\', true );

    return $a_cis_sort_name === $b_cis_sort_name ? 0 : ( $a_cis_sort_name > $b_cis_sort_name ) ? 1 : -1;
}