Question

Fatal error: Call to a member function get_tax_class()出现null错误，该错误指向class-wc-cart-totals.php的230行。似乎购物车项目数据属性为null。我不确定为什么，希望对WooCommerce的胆量有更深入了解的人能为我指明正确的方向。

这里的设置有点独特，我创建了自定义API端点来处理来自客户端的大多数WooCommerce交互。

尝试更新商品数量时出现此错误。

/*Cart controls*/
function my_add_to_cart($request){
    $payload = $request->get_params();

    if ($payload['product_id']){
        $cart_item_key = WC()->cart->add_to_cart( $payload['product_id'], $payload['quantity'] );
    }

    return my_get_cart()[$cart_item_key];
}
function my_remove_cart_item($request){
    $payload = $request->get_params();

    if ($payload['cart_item_id']){
        $payload['success'] = WC()->cart->remove_cart_item( $payload['cart_item_id'] );
    } else {
        $payload['success'] = false;
    }

    return $payload;
}
function my_update_cart_item_quantity($request){

    $payload = $request->get_params();
    if ($payload['cart_item_id']){

        /*This is where the error is triggered in my API */
        $payload['success'] = WC()->cart->set_quantity( $payload['id'], $payload['quantity'], true );

    } else {
        $payload['success'] = false;
    }

    return $payload;
}

内部错误发生在这里：

get_items_from_cart(){
    $this->items = array();

    foreach ( $this->cart->get_cart() as $cart_item_key => $cart_item ) {
        $item                          = $this->get_default_item_props();
        $item->key                     = $cart_item_key;
        $item->object                  = $cart_item;
        $item->tax_class               = $cart_item['data']->get_tax_class();
        /*This line here*/
        $item->taxable                 = 'taxable' === $cart_item['data']->get_tax_status();
        $item->price_includes_tax      = wc_prices_include_tax();
        $item->quantity                = $cart_item['quantity'];
        $item->price                   = wc_add_number_precision_deep( $cart_item['data']->get_price() * $cart_item['quantity'] );
        $item->product                 = $cart_item['data'];
        $item->tax_rates               = $this->get_item_tax_rates( $item );
        $this->items[ $cart_item_key ] = $item;
    }
}

显然$cart_item['data']在这里没有正确实例化，但是我不明白为什么。

我现在有点不知所措。我希望我做过一些明显错误的事情，并且可以在我对开发人员进行可能的错误修复之前解决。.错误...

注意：通过我的API添加和删除项的操作就像一个超级按钮。

Answer 1

一个小时的调试和整个发布之后，我在35秒后发现参数不匹配：

   $payload['success'] = WC()->cart->set_quantity( $payload['id'], $payload['quantity'], true );

需要成为

   $payload['success'] = WC()->cart->set_quantity( $payload['cart_item_id'], $payload['quantity'], true );

WooCommerce-尝试更新数量时购物车项目数据为空

1 个答案: