仅从一种自定义分类法限制购物车中的 WooCommerce 产品

Question

我试图限制我的 Woocommerce 商店的客户一次只能从 1 个“供应商”订购产品。我通过称为“供应商”的自定义分类法定义“供应商”。我正在尝试的代码只是出于某种原因限制了所有内容。

function filter_woocommerce_add_to_cart_validation( $passed, $product_id, $quantity, $variation_id = null, $variations = null ) {
// If passed
if ( $passed ) {
    
    // If cart is NOT empty when a product is added     
    if ( !WC()->cart->is_empty() ) {
        
        // Set vars
        $current_product_tag_ids = array();
        $in_cart_product_tag_ids = array();
        
        // Get current product categories via product_id
        $current_product_tag_ids = wc_get_product_term_ids( $product_id, 'supplier' );

        // Loop through cart items checking for product categories
        foreach ( WC()->cart->get_cart() as $cart_item ) {
            // Get product categories from product in cart via cart item product id
            $in_cart_product_tag_ids = array_merge( $in_cart_product_tag_ids, wc_get_product_term_ids( $cart_item['product_id'], 'product_cat' ) );
        }
        
        // Removes duplicate values
        $in_cart_product_tag_ids = array_unique( $in_cart_product_tag_ids, SORT_NUMERIC );
        
        // Compare
        $compare = array_diff( $current_product_tag_ids, $in_cart_product_tag_ids );
        
        // Result is NOT empty
        if ( !empty ( $compare ) ) {
            wc_add_notice( 'This product is with a different supplier. Please only order from 1 supplier at a time.', 'error' );
            $passed = false;
        }
    }
}

return $passed;
}
add_filter( 'woocommerce_add_to_cart_validation', 'filter_woocommerce_add_to_cart_validation', 10, 5 );

我并不是想将每个供应商限制为 1 个产品，我是想限制他们，以便他们每个订单只能从 1 个供应商处订购产品。例如，一旦他们将来自供应商“供应商 1”的产品添加到他们的购物车中，他们将无法添加来自“供应商 1”以外的任何其他供应商的产品。

我之前 post 尝试使用类别而不是自定义分类法，但我需要它们是分开的，所以我们不受类别的限制。这个 post 可以在这里找到：

Answer 1

以下仅允许将来自一个“供应商”的商品添加到购物车：

add_filter( 'woocommerce_add_to_cart_validation', 'only_one_supplier_by_order', 10, 2 );
function only_one_supplier_by_order( $passed, $product_id ) {
    if ( WC()->cart->is_empty() )  
        return $passed;
    
    $taxonomy = 'supplier';
    $term_ids = wp_get_post_terms( $product_id, $taxonomy, ['fields' => 'ids']);

    // Loop through cart items
    foreach ( WC()->cart->get_cart() as $cart_item ) {
        if( ! has_term( $term_ids, $taxonomy, $cart_item['product_id'] ) ) {
            // Displaying a custom notice
            wc_add_notice( __('This product is with a different supplier. Please only order from 1 supplier at a time.'), 'error' );
            return false; // Avoid add to cart
        }
    }
    return $passed;
}

现在要确保客户无法与购物车中的不同供应商结账，您可以添加：

// To be sure (avoiding checkout)
add_action( 'woocommerce_check_cart_items', 'only_one_supplier_by_order_check' );
function only_one_supplier_by_order_check() {
    $taxonomy   = 'supplier';
    $term_names = []; // Initializing

    // Loop through cart items
    foreach ( WC()->cart->get_cart() as $cart_item ) {
        $terms = wp_get_post_terms( $cart_item['product_id'], $taxonomy );
        if( ! empty($terms) ) {
            $term  = reset($terms);
            
            $term_names[$term->term_id] = $term->name;  
        }
    }

    // Allow only one supplier in cart (avoid checkout for more than one
    if( count( $term_names ) > 1 ) {

        // Displaying a custom notice
        wc_add_notice( __('Only items from one supplier at the time are allowed in cart'), 'error' );
    }
}

代码进入您的活动子主题（或活动主题）的 functions.php 文件。已测试并有效。

仅从一种自定义分类法限制购物车中的 WooCommerce 产品

Limit WooCommerce products in cart only from one custom taxonomy

php

wordpress

cart

custom-taxonomy

woocommerce