在WooCommerce中以编程方式自动将礼品产品变化添加到购物车? [英] Auto add to cart a Gift product variation programmatically in WooCommerce?

问题描述

当有人将商品添加到购物车时，我正在尝试为 woocommerce 创建一个买一送一的报价.下面的代码有效，但仅适用于简单的产品，我尝试将变体 ID 添加到变量中，但不起作用.有任何想法吗?感谢社区

I'm trying to create a buy one get one offer for woocommerce when someone adds a product to the cart. The code below works but only with simple products, I've tried adding the variation ID to the variable but it does not work. Any ideas? thanks to the community

add_action( 'template_redirect', 'bbloomer_add_gift_if_id_in_cart' );
 
function bbloomer_add_gift_if_id_in_cart() {
 
   if ( is_admin() ) return;
   if ( WC()->cart->is_empty() ) return;
 
   $product_bought_id = 421;
   $product_gifted_id = 1256;
 
   // see if product id in cart
   $product_bought_cart_id = WC()->cart->generate_cart_id( $product_bought_id );
   $product_bought_in_cart = WC()->cart->find_product_in_cart( $product_bought_cart_id );
 
   // see if gift id in cart
   $product_gifted_cart_id = WC()->cart->generate_cart_id( $product_gifted_id );
   $product_gifted_in_cart = WC()->cart->find_product_in_cart( $product_gifted_cart_id );
 
   // if not in cart remove gift, else add gift
   if ( ! $product_bought_in_cart ) {
      if ( $product_gifted_in_cart ) WC()->cart->remove_cart_item( $product_gifted_in_cart );
   } else {
      if ( ! $product_gifted_in_cart ) WC()->cart->add_to_cart( $product_gifted_id );
   }
}

推荐答案

要将产品变体添加到购物车，您需要父变量产品ID和产品变体ID(两者).

To add a product variation to cart you need the parent variable product id and the product variation Id (both).

现在，如果客户在购物车页面中更新购物车，并删除了必需的产品ID，则您正在使用的代码已过时，将无法使用.在这种情况下，礼品产品将在重新加载页面或跳转到另一页面后被删除.因此， template_redirect 不是要使用的正确钩子.

Now the code that you are using is obsolete and will not work if customer update cart in cart page, removing the required product id. In this case, the Gift product will be removed after reloading the page or jumping to another page. So template_redirect is not the right hook to be used.

尝试以下方法，它们也可以处理简单的产品和产品变体:

Try the following instead, that handle simple products and product variations too:

add_action( 'woocommerce_before_calculate_totals', 'wc_auto_add_gift_to_cart' );
function wc_auto_add_gift_to_cart( $cart ) {
    if (is_admin() && !defined('DOING_AJAX'))
        return;
    
    $required_product_id = 37; // The required product Id (or variation Id)
    $parent_gift_id      = 40; // The parent variable product Id (gift) for a product variation (set to zero for simple products)
    $product_gift_id     = 41; // the variation Id or the product Id (gift)
    
    $has_required = $gift_key = false; // Initializing
    
    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
        // Check if required product is in cart
        if( in_array( $required_product_id, array($cart_item['product_id'], $cart_item['variation_id']) ) ) {
           $has_required = true;
        }
        // Check if gifted product is already in cart
        if( $cart_item['data']->get_id() == $product_gift_id ) {
           $gift_key = $cart_item_key;
        }
    }
    
    // If gift is in cart, but not the required product: Remove gift from cart
    if ( ! $has_required && $gift_key ) {
        $cart->remove_cart_item( $gift_key );
    }
    // If gift is not in cart and the required product is in cart: Add gift to cart
    elseif ( $has_required && ! $gift_key ) {
        // For simple products
        if( $parent_gift_id == 0 ) {
            $cart->add_to_cart( $product_gift_id );
        } 
        // For product variations (of a variable product)
        else {
            $cart->add_to_cart( $parent_gift_id, 1, $product_gift_id );
        }
    }
}

代码进入您的活动子主题(或活动主题)的functions.php文件中.经过测试，可以正常工作.

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

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