WooCommerce购物车 - 条件商品类别验证

Posted 2021-03-26

我们有一个独家类别X和其他常规类别Y.我想要的：

• 当有人从X类订购任何东西时，其他类别的商品无法添加到购物车中，并应显示警告
• Y类产品不应与X混合使用。

我怎么能实现这一目标？

我从其他帖子得到了这个代码，但它过时且不尽如人意：

<?php

 // Enforce single parent category items in cart at a time based on first item in cart
function get_product_top_level_category ( $product_id ) {

    $product_terms            =  get_the_terms ( $product_id, 'product_cat' );
    $product_category         =  $product_terms[0]->parent;
    $product_category_term    =  get_term ( $product_category, 'product_cat' );
    $product_category_parent  =  $product_category_term->parent;
    $product_top_category     =  $product_category_term->term_id;

    while ( $product_category_parent  !=  0 ) {
            $product_category_term    =  get_term ( $product_category_parent, 'product_cat' );
            $product_category_parent  =  $product_category_term->parent;
            $product_top_category     =  $product_category_term->term_id;
    }

    return $product_top_category;
}

add_filter ( 'woocommerce_before_cart', 'restrict_cart_to_single_category' );
function restrict_cart_to_single_category() {
    global $woocommerce;
    $cart_contents    =  $woocommerce->cart->get_cart( );
    $cart_item_keys   =  array_keys ( $cart_contents );
    $cart_item_count  =  count ( $cart_item_keys );

    // Do nothing if the cart is empty
    // Do nothing if the cart only has one item
    if ( ! $cart_contents || $cart_item_count == 1 ) {
            return null;
    }

    // Multiple Items in cart
    $first_item                    =  $cart_item_keys[0];
    $first_item_id                 =  $cart_contents[$first_item]['product_id'];
    $first_item_top_category       =  get_product_top_level_category ( $first_item_id );
    $first_item_top_category_term  =  get_term ( $first_item_top_category, 'product_cat' );
    $first_item_top_category_name  =  $first_item_top_category_term->name;

    // Now we check each subsequent items top-level parent category
    foreach ( $cart_item_keys as $key ) {
            if ( $key  ==  $first_item ) {
                    continue;
            }
            else {
                    $product_id            =  $cart_contents[$key]['product_id'];
                    $product_top_category  =  get_product_top_level_category( $product_id );

                    if ( $product_top_category  !=  $first_item_top_category ) {
                            $woocommerce->cart->set_quantity ( $key, 0, true );
                            $mismatched_categories  =  1;
                    }
            }
    }

    // we really only want to display this message once for anyone, including those that have carts already prefilled
    if ( isset ( $mismatched_categories ) ) {
            echo '<p class="woocommerce-error">Only one category allowed in cart at a time.<br />You are currently allowed only <strong>'.$first_item_top_category_name.'</strong> items in your cart.<br />To order a different category empty your cart first.</p>';
    }
}
?>

谢谢

答案

更新时间（2019年）

就像所有东西都在扭转您的独家类别category X一样，您需要为此类别使用条件。

你有机会，因为有一个特殊的功能，你可以结合woocommerce产品类别使用。让我们说**cat_x**是你的独家类别的slug，你知道它product_cat是获得产品类别的论据。

因此，使用has_term ()条件函数，您将使用此：

if ( has_term ('cat_x', 'product_cat', $item_id ) ) { // or $product_id
    // doing something when product item has 'cat_x'
} else {
    // doing something when product item has NOT 'cat_x'
}

我们需要在foreach循环中运行购物车项目2次：

• 检测那辆车中是否有cat_x物品。
• 如果检测到购物车中的一个商品的cat_x并触发正确的消息，则删除其他商品。

在下面的代码中，我已经更改为更有用的钩子。此挂钩将检查您的购物车中有什么。想法是在购物车中添加“cat_x”项目时删除购物车中的其他类别项目。

代码评论很好。最后，您会发现触发的不同通知。您需要将真实文本放在每个文本中。

add_action( 'woocommerce_check_cart_items', 'checking_cart_items' );
function checking_cart_items() {
    // Set your product category slug
    $category = 'cat_x';

    $number_of_items = sizeof( WC()->cart->get_cart() );
    $found  = false; // Initializing
    $notice = ''; // Initializing

    if ( $number_of_items > 0 ) {

        // Loop through cart items
        foreach ( WC()->cart->get_cart() as $cart_item ) {
            $product = $cart_item['data'];
            $product_id = $cart_item['product_id'];

            // Detecting if the defined category is in cart
            if ( has_term( $category, 'product_cat', $product_id ) ) {
                $found = true;
                break; // Stop the loop
            }
        }

        // Re-loop through cart items
        foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
            $product = $cart_item['data'];
            $product_id = $cart_item['product_id'];

            if ( $found ) // If the defined product category is in cart
            { 
                if ( $number_of_items == 1 ) { // only one defined product category
                    if ( empty( $notice ) ){
                        $notice = '1';
                    }
                }
                if ( $number_of_items >= 2 ) { // The defined product category + other categories in cart

                    // removing other categories items from cart
                    if ( ! has_term( $category, 'product_cat', $product_id ) ) {
                        WC()->cart->remove_cart_item( $cart_item_key ); // removing item from cart
                        if ( empty( $notice ) || $notice == '1' ){
                            $notice = '2';
                        }
                    }
                }
            } else { // Only other categories items

                if ( empty( $notice ) ){
                    $notice = '3';
                }
            }
        }

        // Firing woocommerce notices
        if ( $notice == '1' ) { // message for an 'cat_x' item only (alone)
            wc_add_notice( sprintf( '<p class="woocommerce-error">bla bla bla one category X item in the cart</p>' ), 'success' );
        } elseif ( $notice == '2' ) { // message for an 'cat_x' item and other ones => removed other ones 
            wc_add_notice( sprintf( '<p class="woocommerce-error">bla bla bla ther is already category X in the cart => Other category items has been removed</p>' ), 'error' );
        } elseif ( $notice == '3' ) { // message for other categories items (if needed)
            wc_add_notice( sprintf( '<p class="woocommerce-error">bla bla bla NOT category X in the cart</p>' ), 'success' );
        }
    }
}       

我不可能真正测试这段代码（但它不会引发错误）......

---

@编辑

我们可以使用除通知之外的其他东西......一切皆有可能。但它是一个很好的起始解决方案，微调。

你需要用真正的类别slug替换'cat_x'（在开头）......