排序我的自定義文章中的產品中的ACF字段在Wordpress中

Question

請問如何根據ACF中的字段（參見圖片）對我的產品（這是我的自定義帖子類型）進行排序？

這裏是我的自定義字段代碼：

/*******   *******/ 
/* CUSTOM POST TYPE  */ 
/*******   *******/ 

// Custom Post Type - product 
function register_post_product() { 
    $labels = array(
    'name'    => __('Products', '_tk'), 
    'singular_name'  => __('Product', '_tk'), 
    'add_new'   => __('Add product', '_tk'), 
    'add_new_item'  => __('Add New product', '_tk'), 
    'edit_item'   => __('Edit product', '_tk'), 
    'new_item'   => __('New product', '_tk'), 
    'all_items'   => __('All products', '_tk'), 
    'view_item'   => __('View product', '_tk'), 
    'search_items'  => __('Search product', '_tk'), 
    'not_found'   => __('No product found', '_tk'), 
    'not_found_in_trash' => __('No product found in the Trash', '_tk'), 
    'parent_item_colon' => '', 
    'menu_name'   => __('Products', '_tk'), 
); 
    $args = array(
    'labels'   => $labels, 
    'hierarchical'  => true, 
    'supports'   => array('title', 'editor', 'page-attributes', 'thumbnail'), 
    'public'   => true, 
    'show_ui'   => true, 
    'show_in_menu'  => true, 
    'show_in_nav_menus' => true, 
    'publicly_queryable' => true, 
    'exclude_from_search' => false, 
    'has_archive'  => true, 
    'rewrite'   => array('slug' => 'produkty','with_front' => false), 
    'menu_position'  => 6, 
    'menu_icon'   => 'dashicons-hammer' 
); 
    register_post_type('product', $args); 
} 
add_action('init', 'register_post_product'); 

我做在谷歌一些搜索，我想這樣的排序是：

add_filter('pre_get_posts', 'my_get_posts'); 
function my_get_posts($query) { 
     $query->set('orderby', 'meta_value_num'); 
     $query->set('order', 'ASC'); 
     $query->set('meta_query','capacity'); 

     return $query; 
} 

，但沒有結果。

Answer 1

在WordPress

<?php 
add_filter('pre_get_posts', 'my_get_posts'); 
function my_get_posts($query) { 

    $query->set('post_type', 'product'); 
    $query->set('meta_key', 'capacity'); 
    $query->set('orderby', 'meta_value'); // meta_value_num or meta_value 
    $query->set('order', 'ASC'); 


    return $query; 
} 
?> 

試試這個下面功能pre_get_posts

Answer 2

最有可能的問題是$query->set('meta_query','capacity');

meta_query應該是一個數組，像

array(array('key' => 'capacity', 
      'value' => array(0, 1000), 
      'compare' => 'BETWEEN', 
      'type' => 'numeric', 
    )); 

https://codex.wordpress.org/Class_Reference/WP_Query