From d84562bedb5a5de6cb91d886836af78541a04c48 Mon Sep 17 00:00:00 2001
From: silinmykola <m.silin@atwix.com>
Date: Tue, 20 Apr 2021 21:00:33 +0300
Subject: [PATCH] 23832 add coupon code to totals model

---
 app/code/Magento/Sales/Block/Order/Totals.php | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/app/code/Magento/Sales/Block/Order/Totals.php b/app/code/Magento/Sales/Block/Order/Totals.php
index 80ce5e2e689c6..65579f3c9cc52 100644
--- a/app/code/Magento/Sales/Block/Order/Totals.php
+++ b/app/code/Magento/Sales/Block/Order/Totals.php
@@ -6,6 +6,7 @@
 namespace Magento\Sales\Block\Order;
 
 use Magento\Sales\Model\Order;
+use Magento\Sales\Model\Order\Invoice;
 
 /**
  * Order totals.
@@ -126,8 +127,13 @@ protected function _initTotals()
          * Add discount
          */
         if ((double)$this->getSource()->getDiscountAmount() != 0) {
-            if ($this->getSource()->getDiscountDescription()) {
-                $discountLabel = __('Discount (%1)', $source->getDiscountDescription());
+            if ($this->getSource() instanceof Invoice) {
+                $discountSource = $this->getSource()->getOrder();
+            } else {
+                $discountSource = $this->getSource();
+            }
+            if ($this->getSource()->getCouponCode()) {
+                $discountLabel = __('Discount (%1)', $discountSource->getCouponCode());
             } else {
                 $discountLabel = __('Discount');
             }
@@ -135,7 +141,7 @@ protected function _initTotals()
                 [
                     'code' => 'discount',
                     'field' => 'discount_amount',
-                    'value' => $source->getDiscountAmount(),
+                    'value' => $discountSource->getDiscountAmount(),
                     'label' => $discountLabel,
                 ]
             );