限制购物车项目来自 WooCommerce 中的同一产品类别

Restricting cart items to be from the same product category in WooCommerce(限制购物车项目来自 WooCommerce 中的同一产品类别)

问题描述

当购物车中添加了具有特殊产品类别cat_x"的项目并显示一些不同的自定义通知时，我使用下面的代码从购物车中删除其他 WooCommerce 产品类别项目.代码来自这个线程并且可以正常工作嗯:

I am using the code below to remove other WooCommerce product category items from the cart when there is an item with a special product category 'cat_x' added in cart and display some different custom notices. The code came from this thread and just works well:

add_action( 'woocommerce_check_cart_items', 'checking_cart_items' );
function checking_cart_items() {
    $special = false;
    $catx = 'cat_x';
    $number_of_items = sizeof( WC()->cart->get_cart() );

    if ( $number_of_items > 0 ) {

        // Loop through all cart products
        foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
            $item = $values['data'];
            $item_id = $item->id;

            // detecting if 'cat_x' item is in cart
            if ( has_term( $catx, 'product_cat', $item_id ) ) {
                if (!$special)
                    $special = true;
            }
        }

        // Re-loop through all cart products
        foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
            $item = $values['data'];
            $item_id = $item->id;

            if ( $special ) // there is a 'cat_x' item in cart
            { 
                if ( $number_of_items == 1 ) { // only one 'cat_x' item in cart
                    if ( empty( $notice ) )
                        $notice = '1';
                }
                if ( $number_of_items >= 2 ) { // 'cat_x' item + other categories items in cart
            // removing other categories items from cart
                    if ( !has_term( $catx, 'product_cat', $item_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 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' );
        }
    }
} 

有条件函数 has_term() 也适用于类别数组，我尝试在该代码中设置类别数组而不是一个类别.但它不起作用.

Has the conditional function has_term() works also with arrays of categories, I have tried instead of one category, to set an array of categories in that code. But it’s not working.

但是，我的需求发生了变化:我不想让客户有可能从不同类别中选择购物车项目.因此，购物车必须始终包含来自同一产品类别的商品.

However, my needs have changed: I don’t want to let the customer have the possibility to select cart items from different categories. So the cart must always have items from the same product category.

有什么帮助吗?

谢谢.

推荐答案

制作一个挂在 woocommerce_add_to_cart_validation 过滤器钩子中的自定义函数将以更简单的方式完成这项工作，无需设置类别数组.

Making a custom function hooked in woocommerce_add_to_cart_validation filter hook is going to do the job in a much more simpler way, without any need to set an array of categories.

所以你的代码会更快更紧凑.此外，您还可以显示自定义通知以警告客户.

So your code will be much more faster and compact. Additionally you can display a custom notice to warn the customer.

如果购物车中有不同类别的商品，此代码将避免添加到购物车:

This code will avoid adding to cart, if an item of a different category is in cart:

add_filter( 'woocommerce_add_to_cart_validation', 'add_to_cart_validation_callback', 10, 3 );
function add_to_cart_validation_callback( $passed, $product_id, $quantity) {
    // HERE set your alert text message
    $message = __( 'MY ALERT MESSAGE.', 'woocommerce' );
    
    if( ! WC()->cart->is_empty() ) {
        // Get the product category terms for the current product
        $terms_slugs = wp_get_post_terms( $product_id, 'product_cat', array('fields' => 'slugs'));
        
        // Loop through cart items
        foreach (WC()->cart->get_cart() as $cart_item ){
            if( ! has_term( $terms_slugs, 'product_cat', $cart_item['product_id'] )) {
                $passed = false;
                wc_add_notice( $message, 'error' );
                break;
            }
        }
    }
    return $passed;
}

代码位于活动子主题(或主题)的 function.php 文件或任何插件文件中.

此代码已经过测试并且可以运行

This code is tested and it works

限制购物车中的商品只能来自不同的产品类别:

替换函数中的条件:

if( ! has_term( $product_cats, 'product_cat', $cart_item['product_id'] )) { 

由

if( has_term( $product_cats, 'product_cat', $cart_item['product_id'] )) {

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