检查 WooCommerce 优惠券是否已经存在

Question

我正在编辑装箱单，它是在订单付款和包装时生成的。如果包含特定类别的产品，装箱单会自动添加一张优惠券，该优惠券也会打印在上面。

我的问题是，每次刷新或重新打开装箱单时，都会生成一张具有相同优惠券代码的新优惠券。所以我想实施一个规则，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，只有当带有 coupon_code 的优惠券不存在时，所有这些代码才会被执行。

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

感谢您的帮助！

Answer 1

更新（添加了 WooCommerce 3 兼容性）

这是一个为 $order->id 创建特殊 meta_key 的解决方案，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。

这是你修改后的代码（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……

检查 WooCommerce 优惠券是否已经存在

Check if WooCommerce Coupon already exists

php

wordpress

orders

coupon

woocommerce