coupon/models.py

@@ -171,7 +171,7 @@ class UserCouponInfo(BaseModelMixin):

                             'has_used': self.has_used,
              

                             'admin_id': self.admin_id,
              

                             'admin_name': self.admin_name,
              

                -            'used_at': tc.local_string(utc_dt=self.used_at, format='%Y-%m-%d'),
              

                +            'used_at': tc.local_string(utc_dt=self.used_at, format='%Y-%m-%d') if self.used_at else '',
              

                             'coupon_from': self.activity_name if self.coupon_from == 'PROMOTION' else self.coupon_from,
              

                             'clerk_name': self.clerk_name,
              

                             'distributor_name': self.distributor_name,