fix: Discount code quantity calculation

app/api/helpers/ticketing.py

@@ -32,18 +32,16 @@ def get_order_expiry():
     def match_discount_quantity(discount_code, tickets=None, ticket_holders=None):
         qty = 0
         ticket_ids = [ticket.id for ticket in discount_code.tickets]
-        old_holders = get_count(
-            TicketHolder.query.filter(
-                TicketHolder.ticket_id.in_(ticket_ids)  # pytype: disable=attribute-error
-            )
-            .join(Order)
-            .filter(Order.status.in_(['completed', 'placed']))
-        )
+        old_holders = discount_code.confirmed_attendees_count
         if ticket_holders:
-            for holder in ticket_holders:
-                ticket_holder = TicketHolder.query.filter_by(id=holder).one()
-                if ticket_holder.ticket.id in ticket_ids:
-                    qty += 1
+            # pytype: disable=attribute-error
+            qty = get_count(
+                TicketHolder.query.filter(
+                    TicketHolder.id.in_(ticket_holders),
+                    TicketHolder.ticket_id.in_(ticket_ids),
+                )
+            )
+            # pytype: enable=attribute-error
         elif tickets:
             for ticket in tickets:
                 if int(ticket['id']) in ticket_ids:

app/factories/discount_code.py

@@ -41,7 +41,7 @@ class Meta:
     type = "amount"
     is_active = True
     tickets_number = 30
-    min_quantity = 10
+    min_quantity = 1
     max_quantity = 20
     valid_from = common.date_
     valid_till = common.dateEnd_

app/models/discount_code.py

@@ -1,7 +1,10 @@
 from datetime import datetime
 from sqlalchemy.sql import func
+from app.api.helpers.db import get_count
 from app.models import db
 from app.models.base import SoftDeletionModel
+from app.models.order import Order
+from app.models.ticket_holder import TicketHolder
 
 TICKET = 'ticket'
 EVENT = 'event'
@@ -75,6 +78,22 @@ def __repr__(self):
     def __str__(self):
         return self.__repr__()
 
+    def get_confirmed_attendees_query(self):
+        return (
+            TicketHolder.query.filter_by(deleted_at=None)
+            .join(Order)
+            .filter_by(discount_code_id=self.id, deleted_at=None)
+            .filter(Order.status.in_(['completed', 'placed']))
+        )
+
+    @property
+    def confirmed_attendees(self):
+        return self.get_confirmed_attendees_query().all()
+
+    @property
+    def confirmed_attendees_count(self):
+        return get_count(self.get_confirmed_attendees_query())
+
     @property
     def serialize(self):
         """Return object data in easily serializable format"""

tests/all/integration/api/helpers/test_ticketing.py

@@ -0,0 +1,51 @@
+from app.api.helpers.ticketing import TicketingManager
+from app.factories.attendee import AttendeeFactoryBase
+from app.factories.order import OrderFactory
+from app.factories.ticket import TicketFactory
+from app.factories.discount_code import DiscountCodeTicketFactory
+from app.models import db
+
+from tests.all.integration.utils import OpenEventTestCase
+
+
+class TestTicketing(OpenEventTestCase):
+    def test_match_discount_quantity(self):
+        """Method to test the quantity calculation of discount code"""
+
+        with self.app.test_request_context():
+            ticket = TicketFactory()
+            discount_code = DiscountCodeTicketFactory(tickets_number=5)
+            discount_code.tickets.append(ticket)
+
+            order_without_discount = OrderFactory(status='completed')
+
+            db.session.commit()
+
+            # Attendees associated with the order without discount code should not be counted
+            AttendeeFactoryBase.create_batch(
+                10, order_id=order_without_discount.id, ticket_id=ticket.id
+            )
+
+            self.assertTrue(
+                TicketingManager.match_discount_quantity(
+                    discount_code, ticket_holders=[1]
+                )
+            )
+
+            order_with_discount = OrderFactory(
+                status='completed', discount_code_id=discount_code.id
+            )
+
+            db.session.commit()
+
+            # Attendees associated with the order with discount code should be counted
+            AttendeeFactoryBase.create_batch(
+                5, order_id=order_with_discount.id, ticket_id=ticket.id
+            )
+
+            self.assertFalse(
+                TicketingManager.match_discount_quantity(
+                    discount_code, ticket_holders=[1]
+                )
+            )
+            self.assertEqual(5, discount_code.confirmed_attendees_count)