如果购物车包含特定的 Woocommerce 产品类别，则阻止添加到购物车

Question

我的问题和代码直接基于这个问题 - ” 我有一个包含 5 个类别的商店。它是多供应商，由于运输的复杂性，当购物车中只有一个特定类别（“油漆”）的产品时，我只能销售它们。因此，当购物车包含油漆时，我需要防止将任何非油漆产品添加到购物车，并显示错误消息，我需要防止将油漆产品添加到包含任何其他类别的购物车，并显示错误消息。< /p>

我试图从我在 Stackoverflow 和其他地方发现的片段中拼凑出这段代码。该逻辑似乎在我的大脑中起作用，但是当我尝试实现代码（通过 functions.php）时，它会阻止任何产品添加到购物车，除非购物车是空的。”

问题链接 - Prevent add to cart if cart contains a specific category (WooCommerce)

我已经检查并修改了已接受的答案以满足我的需要，但是它似乎根本不起作用，因为我有相同的问题，只是与不同的类别（即气体而不是油漆）有关，据我所知，我会只需修改“has_term”函数即可使其正常工作，因为它只是指向特定类别的问题？

//*** Prevent mixture of gas and other prods in same cart ***//
function dont_add_gas_to_cart_containing_other($validation, $product_id) {

// Set flag false until we find a product in gas
    $cart_has_gas = false;

// Set $cat_check true if a cart item is in gas cat
    foreach (WC()->cart->get_cart() as $cart_item_key => $cart_item) {

        $product = $cart_item['data'];

        if (has_term('Gas', 'Gas Tanks & Accessories', $product->id)) {
            $cart_has_gas = true;
            // break because we only need one "true" to matter here
            break;
        }
    }

    $product_is_gas = false;
    if (has_term('Gas', 'Gas Tanks & Accessories', $product_id)) {
        $product_is_gas = true;
    }

// Return true if cart empty
    if (!WC()->cart->get_cart_contents_count() == 0) {
        // If cart contains gas and product to be added is not gas, display error message and return false.
        if ($cart_has_gas && !$product_is_gas) {
            wc_add_notice('Sorry, you can only purchase Helium Gas products on their own. To purchase this product, please checkout your current cart or empty your cart and try again', 'error');
            $validation = false;
        }
        // If cart contains a product that is not gas and product to be added is gas, display error message and return false.
        elseif (!$cart_has_gas && $product_is_gas) {
            wc_add_notice('Sorry, you can only purchase Helium Gas products on their own. To purchase this product, please checkout your current cart or empty your cart and try again', 'error');
            $validation = false;
        }
    }
    // Otherwise, return true.
    return $validation;
}

add_filter('woocommerce_add_to_cart_validation', 'dont_add_gas_to_cart_containing_other', 10, 2);

Answer 1

因为你给函数指定了类别名称，所以你必须给函数一个 slug，第二个参数应该是 'product_cat'，最后一个参数应该是 Product ID。

$product = $cart_item['data'];

if( has_term( 'gas', 'product_cat', $product->get_id() ) ) {
    ......
}