检查 WooCommerce 优惠券是否已存在

Question

我正在编辑一个装箱单，它是在订单付款和包装时生成的。如果包含某个类别的产品，装箱单会自动添加一张优惠券，该优惠券也会打印在其上。

我的问题是，每次我刷新或重新打开装箱单时，都会使用相同的优惠券代码生成新的优惠券。所以我想实现一个规则，检查 coupon_code 是否已经存在。

add_action( 'wpo_wcpdf_after_order_details', 'wpo_wcpdf_custom_text_categories', 10, 2 );
function wpo_wcpdf_custom_text_categories ($template_type, $order) {
    // collect categories from order items
    $order_cats = array();
    $items = $order->get_items();
    foreach ($items as $item_id => $item) {
        $product = $order->get_product_from_item($item);
        if ($product) {
            $terms = get_the_terms( $product->id , 'product_cat' );
            foreach ($terms as $term) {
                $order_cats[$term->term_id] = $term->name;
            }
        }
    }
    $target = array('Testtragen', 'Testtragetuch');
    // 
    // check for your category requirement
    if(count(array_intersect($order_cats, $target)) > 0 && $template_type == 'packing-slip'){
        $coupon_code = $order->get_order_number();
        $discount_type = 'fixed_product'; // Type: fixed_cart, percent, fixed_product, percent_product       
        $order_date = get_post_meta( $order->id, '_wcpdf_order_date', true );
        $due_date = date_i18n( get_option( 'date_format' ), strtotime( $invoice_date . ' + 60 days') );
        $email = $order->billing_email;   



        $amount = '10'; // Amount
        $discount_type = 'fixed_cart'; // Type: fixed_cart, percent, fixed_product, percent_product

        $coupon = array(
            'post_title'   => $coupon_code,
            'post_content' => '',
            'post_status'  => 'publish',
            'post_author'  => 1,
            'post_type'    => 'shop_coupon'
        );
        /*          
        $new_coupon_id = wp_insert_post( $coupon );

        // Add meta
        update_post_meta( $new_coupon_id, 'discount_type', $discount_type );
        update_post_meta( $new_coupon_id, 'coupon_amount', $amount );
        update_post_meta( $new_coupon_id, 'individual_use', 'no' );
        update_post_meta( $new_coupon_id, 'product_ids', '' );
        update_post_meta( $new_coupon_id, 'exclude_product_ids', '' );
        update_post_meta( $new_coupon_id, 'usage_limit', '' );
        update_post_meta( $new_coupon_id, 'expiry_date', '' );
        update_post_meta( $new_coupon_id, 'apply_before_tax', 'yes' );
        update_post_meta( $new_coupon_id, 'free_shipping', 'no' );   
        */
    }
}

所以我想在wp_insert_post($coupon) 之前添加一个if 语句，所有这些代码只有在带有coupon_code 的优惠券不存在时才会执行。

我试过了：term_exists( $coupon_code, ‘coupons’)但这没有用。

感谢您的帮助！

Answer 1

更新（添加 WooCommerce 3 兼容性）

这是一个解决方案，为$order->id 创建一个特殊的meta_key，以避免在刷新或重新打开装箱单时使用相同的优惠券代码生成新的优惠券。

这是您更改的代码（带有注释说明）：

add_action( 'wpo_wcpdf_after_order_details', 'wpo_wcpdf_custom_text_categories', 10, 2 );
function wpo_wcpdf_custom_text_categories ($template_type, $order) {
    // collect categories from order items
    $order_cats = array();

    $order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;

    // Loop through order items
    foreach ($order->get_items() as $item_id => $item) {
        $product = version_compare( WC_VERSION, '3.0', '<' ) ? $product_id = version_compare( WC_VERSION, '3.0', '<' ) ? $cart_item['data']->id : $cart_item['data']->get_id() : $item->get_product();
        $product_id = method_exists( $product, 'get_id' ) ? $item->get_product_id() : $item['product_id'];
        if ($product) {
            $terms = get_the_terms( $product_id , 'product_cat' );
            foreach ($terms as $term) {
                $order_cats[$term->term_id] = $term->name;
            }
        }
    }
    $target = array('Testtragen', 'Testtragetuch');
    // 
    // check for your category requirement
    if(count(array_intersect($order_cats, $target)) > 0 && $template_type == 'packing-slip'){
        $coupon_code = $order->get_order_number();
        $discount_type = 'fixed_product'; // Type: fixed_cart, percent, fixed_product, percent_product       
        $order_date = get_post_meta( $order_id, '_wcpdf_order_date', true );
        $due_date = date_i18n( get_option( 'date_format' ), strtotime( $invoice_date . ' + 60 days') );
        $email = method_exists( $order, 'get_billing_email' ) ? $order->get_billing_email() : $order->billing_email;

        $amount = '10'; // Amount
        $discount_type = 'fixed_cart'; // Type: fixed_cart, percent, fixed_product, percent_product

        $coupon = array(
            'post_title'   => $coupon_code,
            'post_content' => '',
            'post_status'  => 'publish',
            'post_author'  => 1,
            'post_type'    => 'shop_coupon'
        );


        // @@@ We create a meta_key '_wcpdf_coupon' for this order with value 'no'
        if( empty( get_post_meta( $order_id, '_wcpdf_coupon', true) ) ) {
            add_post_meta( $order_id, '_wcpdf_coupon', 'no', true );
        }

        // @@@ if this meta_key for this order has a value = 'no' was update it to 'yes'
        if( get_post_meta( $order_id, '_wcpdf_coupon', true) == 'no' ) {

            // Now we update it to 'yes'. This avoid the coupon be reused for this order.
            update_post_meta( $order_id, '_wcpdf_coupon', 'yes');

            $new_coupon_id = wp_insert_post( $coupon );

            // Add meta
            update_post_meta( $new_coupon_id, 'discount_type', $discount_type );
            update_post_meta( $new_coupon_id, 'coupon_amount', $amount );
            update_post_meta( $new_coupon_id, 'individual_use', 'no' );
            update_post_meta( $new_coupon_id, 'product_ids', '' );
            update_post_meta( $new_coupon_id, 'exclude_product_ids', '' );
            update_post_meta( $new_coupon_id, 'usage_limit', '' );
            update_post_meta( $new_coupon_id, 'expiry_date', '' );
            update_post_meta( $new_coupon_id, 'apply_before_tax', 'yes' );
            update_post_meta( $new_coupon_id, 'free_shipping', 'no' );
        }
    }
}

这应该可以解决这个问题……