如果购物车包含特定类别(WooCommerce)，则阻止添加到购物车 [英] Prevent add to cart if cart contains a specific category (WooCommerce)

问题描述

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.

I have a store containing 5 categories. It's multivendor and due to shipping complications, I can only sell products from one specific category ('paint') when they are alone in the cart. So I need to prevent add to cart of any non-paint products when the cart contains paint, and display an error message, and I need to prevent paint products being added to a cart containing any other categories, and disaply an error message.

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.

I've tried to cobble together this code from snippets I've found lying around on Stackoverflow and elsewhere. The logic seems to work in my brain, but when I try to implement the code (through functions.php) it prevents any product from being added to the cart unless the cart is empty.

这是我的代码:

//*** Prevent mixture of paint and other prods in same cart ***//
function dont_add_paint_to_cart_containing_other() {

// Set flag false until we find a product in cat paint
$cat_check = false;

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

    $product = $cart_item['data'];

    if ( has_term( 'paint', 'product_cat', $product->id ) ) {
                $cat_check = true;
        // break because we only need one "true" to matter here
        break;
        }
}
// Return true if cart empty
if ( WC()->cart->get_cart_contents_count() == 0 ) {
    return true;
    }
    // If cart contains paint and product to be added is not paint, display error message and return false.
    elseif ( $cat_check && get_queried_object()->term_id != '245778522') {
        wc_add_notice( 'Sorry, you can only purchase paint products on their own. To purchase this product, please checkout your current cart or empty your cart and try again' , 'error' );
        return false;
    }
    // If cart contains a product that is not paint and product to be added is paint, display error message and return false.
    elseif (!$cat_check && get_queried_object()->term_id = '245778522') {
        wc_add_notice( 'Sorry, you can only purchase paint products on their own. To purchase this product, please checkout your current cart or empty your cart and try again' , 'error' );
        return false;
    }
    // Otherwise, return true.
    return true;
}

add_filter( 'woocommerce_add_to_cart_validation', 'dont_add_paint_to_cart_containing_other' );

推荐答案

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

// Set flag false until we find a product in cat paint
    $cart_has_paint = false;

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

        $product = $cart_item['data'];

        if (has_term('paint', 'product_cat', $product->id)) {
            $cart_has_paint = true;
            // break because we only need one "true" to matter here
            break;
        }
    }

    $product_is_paint = false;
    if (has_term('paint', 'product_cat', $product_id)) {
        $product_is_paint = true;
    }

// Return true if cart empty
    if (!WC()->cart->get_cart_contents_count() == 0) {
        // If cart contains paint and product to be added is not paint, display error message and return false.
        if ($cart_has_paint && !$product_is_paint) {
            wc_add_notice('Sorry, you can only purchase paint products on their own. To purchase this product, please checkout your current cart or empty your cart and try again', 'error');
            $validation = false;
        }
        // If cart contains a product that is not paint and product to be added is paint, display error message and return false.
        elseif (!$cart_has_paint && $product_is_paint) {
            wc_add_notice('Sorry, you can only purchase paint 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_paint_to_cart_containing_other', 10, 2);

改成这个

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