wordpress - 错误 Woocommerce REST API 扩展订单 "line_items"响应

Question

我正在尝试为 Orders 端点中的 line_items 创建一个新值，但它显示了一个我不知道如何解决的错误!
代码来自:Woocommerce REST API extending order response
其他有用的链接:

https://developer.wordpress.org/reference/functions/register_rest_field/

https://francescocarlucci.com/woocommerce/woocommerce-api-custom-data-default-endpoints/

Is it possible to extend the woocommerce products rest endpoint?

代码

function get_product_order_image( $response, $object, $request ) {
 
    if( empty( $response->data ) )
        return $response;
    $order_pid= $response->data['line_items'][0]['product_id'];
     $l_w_product_meta = get_post_meta($response->data['line_items'][0]['product_id']);
    $order_imgUrl= wp_get_attachment_url( $l_w_product_meta['_thumbnail_id'][0], 'full' );

    $response->data['line_items'][0]['cover_image'] = $order_imgUrl;
 
    return $response;
} 

add_filter( "woocommerce_rest_prepare_shop_order_object", array( $this, "get_product_order_image"), 10, 3 );

错误:
由于文件 wp-content/themes/store-child/functions.php 的第 336 行出错，您的 PHP 代码更改已回滚。请修复并再次尝试保存。

Uncaught Error: Using $this when not in object context in wp-content/themes/store-child/functions.php:336
Stack trace:
#0 wp-settings.php(528): include()
#1 wp-config.php(89): require_once('/kunden/631823_...')
#2 wp-load.php(37): require_once('/kunden/631823_...')
#3 wp-admin/admin.php(34): require_once('/kunden/631823_...')
#4 wp-admin/theme-editor.php(10

谢谢!!

Answer 1

如果该函数需要添加到主题的 functions.php 而不是在类中，请尝试替换:

add_filter( "woocommerce_rest_prepare_shop_order_object", array( $this, "get_product_order_image"), 10, 3 );

和:

add_filter( "woocommerce_rest_prepare_shop_order_object", "get_product_order_image", 10, 3 );

它应该可以解决您发布的错误。