fix: error 500 dashboard after applying ecommerse coupon (openedx#4003)

Co-authored-by: Muhammad Zubair <[email protected]>

ecommerce/extensions/api/serializers.py

@@ -956,6 +956,7 @@ class VoucherSerializer(serializers.ModelSerializer):
  is_available_to_user = serializers.SerializerMethodField()
  benefit = serializers.SerializerMethodField()
  redeem_url = serializers.SerializerMethodField()
+ end_datetime = serializers.DateTimeField(format=ISO_8601_FORMAT)
 
  def get_is_available_to_user(self, obj):
  request = self.context.get('request')

ecommerce/extensions/api/v2/tests/views/test_vouchers.py

@@ -68,6 +68,30 @@ def create_vouchers(self, partner=None, count=1):
  coupon_vouchers.vouchers.add(voucher)
  return vouchers
 
+ def test_generate_correct_end_datetime(self):
+ """
+ Test that the 'end_datetime' parameter is generated in the correct format.
+
+ The 'end_datetime' parameter should be generated as a string in the
+ format '%Y-%m-%dT%H:%M:%SZ', representing the end date and time.
+ The created voucher's 'end_datetime' has the milliseconds part if to
+ retrieve it directly from the DB.
+ """
+ self.create_vouchers()
+ response = self.client.get(self.path)
+ response_data = response.json()
+ result = response_data['results'][0]
+ end_datetime = result['end_datetime']
+ is_valid_format = False
+
+ try:
+ datetime.datetime.strptime(end_datetime, '%Y-%m-%dT%H:%M:%SZ')
+ is_valid_format = True
+ except ValueError:
+ pass
+
+ self.assertTrue(is_valid_format)
+
  def test_list(self):
  """ Verify the endpoint lists all vouchers. """
  vouchers = self.create_vouchers(count=3)