订单编辑页面中的WooCommerce自定义字段

问题描述：

// Display custom field Orders edit page
add_action('woocommerce_before_order_itemmeta', 'storage_location_of_order_items', 10, 3);
function storage_location_of_order_items($item_id, $item, $product)
{
    // Only on backend order edit pages
    if (!(is_admin() && $item->is_type('line_item'))) return;

// Get your '_laoriiul' value (replace the slug by yours below)
    $custom_ladu = get_post_meta($product->get_id(), '_laoriiul', true); //Error message: "Uncaught Error: Call to a member function get_id() on bool in functions.php:211"  - when product not aviable (line 211)
     if (isset($custom_ladu)) { // only show the custom SKU if it's set
        echo "<br>" . wp_kses_post("Laoriiul: $custom_ladu"); // change this line if needed
    }
    }

当不再有产品在商店时-当不再获得ID时，就会出现问题/错误.如何在获取ID之前控制是否存在产品ID?尝试过其他解决方案并没有帮助我.有人在帮助我吗?

The problem/error occurs when not product in shop anymore - when not get ID anymore. How to control if exist product id before get id? Have tried different solutions nothing helping me there. Anyone helping me in that?

答

我无法重现该错误，但从错误开始，我想您可以使用以下内容.

I'm not able to reproduce the error, but starting from the error I suppose you can use the following.

method_exists(混合$ object，字符串$ method_name):bool

检查给定对象中是否存在类方法.

Checks if the class method exists in the given object.

您碰巧使用了较早版本的WooCommerce或Wordpress吗?

Do you happen to use an older version of WooCommerce or Wordpress?

// Display custom field Orders edit page
function storage_location_of_order_items( $item_id, $item, $product ) { 
    // Only on backend order edit pages
    if (!(is_admin() && $item->is_type('line_item'))) return;

    // Checks if the class method exists
    if ( method_exists( $product, 'get_id' ) ) {
        // Get product id
        $product_id = $product->get_id();

        // Get your '_laoriiul' value (replace the slug by yours below)
        $custom_ladu = get_post_meta( $product_id, '_laoriiul', true);

        if ( isset( $custom_ladu ) ) { // only show the custom SKU if it's set
            echo "<br>" . wp_kses_post( $custom_ladu ); // change this line if needed
        }
    }
}
add_action('woocommerce_before_order_itemmeta', 'storage_location_of_order_items', 10, 3);

订单编辑页面中的WooCommerce自定义字段

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