在 Woocommerce 中一次只允许购物车中的一个产品类别

Question

我将如何 go 关于配置 Woocommerce 购物车一次只允许一种产品类别类型？

Answer 1

以下代码将允许仅将来自一个产品类别的商品添加到购物车，从而避免添加到购物车并显示自定义通知：

add_filter( 'woocommerce_add_to_cart_validation', 'only_one_product_category_allowed', 20, 3 );
function only_one_product_category_allowed( $passed, $product_id, $quantity) {

    // Getting the product categories term slugs in an array for the current product
    $term_slugs   = wp_get_post_terms( $product_id, 'product_cat', array('fields' => 'slugs') );

    // Loop through cart items
    foreach (WC()->cart->get_cart() as $cart_item_key => $cart_item ){

        // Check if the product category of the current product don't match with a cart item
        if( ! has_term( $term_slugs, 'product_cat', $cart_item['product_id'] ) ){

            // Displaying a custom notice
            wc_add_notice( __('Only items from one product category are allowed in cart'), 'error' );

            // Avoid add to cart
            return false; // exit
        }
    }
    return $passed;
}

代码位于活动子主题（或活动主题）的 function.php 文件中。 测试和工作。

---

添加（更新） - 相同但仅适用于父产品类别：

add_filter( 'woocommerce_add_to_cart_validation', 'only_one_product_category_allowed', 20, 3 );
function only_one_product_category_allowed( $passed, $product_id, $quantity) {
    $parent_term_ids = $item_parent_term_ids = array(); // Initializing

    // Loop through the current product category terms to get only parent main category term
    foreach( get_the_terms( $product_id, 'product_cat' ) as $term ){
        if( $term->parent > 0 ){
            $parent_term_ids[] = $term->parent; // Set the parent product category
        }
    }

    // Loop through cart items
    foreach (WC()->cart->get_cart() as $cart_item_key => $cart_item ){
        // Loop through the cart item product category terms to get only parent main category term
        foreach( get_the_terms( $cart_item['product_id'], 'product_cat' ) as $term ){
            if( $term->parent > 0 ){
                $item_parent_term_ids[] = $term->parent; // Set the parent product category
            }
        }

        // Check if parent product categories don't match
        if( ! array_intersect( $parent_term_ids, $item_parent_term_ids ) ){

            // Displaying a custom notice
            wc_add_notice( __('Only items from one product category are allowed in cart'), 'error' );

            // Avoid add to cart
            return false; // exit
        }
    }
    return $passed;
}

代码位于活动子主题（或活动主题）的 function.php 文件中。 测试和工作。

Answer 2

@LoicTheAztec 如果我只想允许添加某个类别中的产品以在结帐时添加，该怎么办。 我的情况是，我有一些可预订的产品和实物产品，它们都有不同的运费。 所以我想要一个案例，如果有人订购可预订产品，他们将无法将任何实物产品添加到购物车，除非他们在单独的订单上这样做。 谢谢

Answer 3

感谢LoicTheAztec提供了很好的答案！
但是，父产品类别版本不适合我的情况。
LoicTheAztec的版本在产品的类别没有父类别时返回 false，即使这些产品具有相同的类别。
这是处理上述情况的修改。

add_filter( 'woocommerce_add_to_cart_validation', 'only_one_product_category_allowed', 20, 3 );
function only_one_product_category_allowed( $passed, $product_id, $quantity) {
    $parent_term_ids = $item_parent_term_ids = array(); // Initializing

    // Loop through the current product category terms to get the parent main category term if any.
    // Otherwise we get the current product's own category.
    foreach( get_the_terms( $product_id, 'product_cat' ) as $term ){
        if ( $term->parent > 0 ){
            $parent_term_ids[] = $term->parent; // Set the parent product category
        } else {
            $parent_term_ids[] = $term->term_id; // Set the category itself of the current product for later comparison
        }
    }

    // Loop through cart items
    foreach (WC()->cart->get_cart() as $cart_item_key => $cart_item ){
        // Loop through the cart item product category terms to get the parent main category term if any.
        // Otherwise we get the cart item's own category.
        foreach( get_the_terms( $cart_item['product_id'], 'product_cat' ) as $term ){
            if ( $term->parent > 0 ){
                $item_parent_term_ids[] = $term->parent; // Set the parent product category
            } else {
                $item_parent_term_ids[] = $term->term_id; // Set the category itself of the cart item for later comparison
            }
        }

        // Check if parent product categories don't match
        if( ! array_intersect( $parent_term_ids, $item_parent_term_ids ) ){

            // Displaying a custom notice
            wc_add_notice( __('Only items from one product category are allowed in cart'), 'error' );

            // Avoid add to cart
            return false; // exit
        }
    }
    return $passed;
}