implement cross_selling_visibility "always" and "products"

src/pretix/base/models/items.py

@@ -142,6 +142,18 @@ class ItemCategory(LoggedModel):
         verbose_name_plural = _("Product categories")
         ordering = ('position', 'id')
 
+    def cross_sell_visible(self, cart_positions):
+        if self.cross_selling_mode is None:
+            return False
+        if self.cross_selling_condition == 'always':
+            return True
+        if self.cross_selling_condition == 'products':
+            match = set(match.pk for match in self.cross_selling_match_products.only('pk')) # TODO prefetch this
+            return any(pos.item.pk in match for pos in cart_positions)
+        if self.cross_selling_condition == 'discounts':
+            # TODO not sure how to do this yet
+            return False
+
     def __str__(self):
         name = self.internal_name or self.name
         if self.is_addon:
@@ -295,7 +307,7 @@ class SubEventItemVariation(models.Model):
         return True
 
 
-def filter_available(qs, channel='web', voucher=None, allow_addons=False):
+def filter_available(qs, channel='web', voucher=None, allow_addons=False, allow_cross_sell=False):
     # Channel can currently be a SalesChannel or a str, since we need that compatibility, but a SalesChannel
     # makes the query SIGNIFICANTLY faster
     from .organizer import SalesChannel
@@ -316,6 +328,8 @@ def filter_available(qs, channel='web', voucher=None, allow_addons=False):
 
     if not allow_addons:
         q &= Q(Q(category__isnull=True) | Q(category__is_addon=False))
+    if not allow_cross_sell:
+        q &= Q(Q(category__isnull=True) | ~Q(category__cross_selling_mode='only'))
 
     if voucher:
         if voucher.item_id:
@@ -329,8 +343,8 @@ def filter_available(qs, channel='web', voucher=None, allow_addons=False):
 
 
 class ItemQuerySet(models.QuerySet):
-    def filter_available(self, channel='web', voucher=None, allow_addons=False):
-        return filter_available(self, channel, voucher, allow_addons)
+    def filter_available(self, channel='web', voucher=None, allow_addons=False, allow_cross_sell=False):
+        return filter_available(self, channel, voucher, allow_addons, allow_cross_sell)
 
 
 class ItemQuerySetManager(ScopedManager(organizer='event__organizer').__class__):
@@ -338,8 +352,8 @@ class ItemQuerySetManager(ScopedManager(organizer='event__organizer').__class__)
         super().__init__()
         self._queryset_class = ItemQuerySet
 
-    def filter_available(self, channel='web', voucher=None, allow_addons=False):
-        return filter_available(self.get_queryset(), channel, voucher, allow_addons)
+    def filter_available(self, channel='web', voucher=None, allow_addons=False, allow_cross_sell=False):
+        return filter_available(self.get_queryset(), channel, voucher, allow_addons, allow_cross_sell)
 
 
 class Item(LoggedModel):

src/pretix/base/services/cart.py

@@ -1610,7 +1610,7 @@ def clear_cart(self, event: Event, cart_id: str=None, locale='en', sales_channel
 
 
 @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,))
-def set_cart_addons(self, event: Event, addons: List[dict], cart_id: str=None, locale='en',
+def set_cart_addons(self, event: Event, addons: List[dict], add_to_cart_items: List[dict], cart_id: str=None, locale='en',
                     invoice_address: int=None, sales_channel='web', override_now_dt: datetime=None) -> None:
     """
     Assigns addons to eligible products in a user's cart, adding and removing the addon products as necessary to
@@ -1635,6 +1635,7 @@ def set_cart_addons(self, event: Event, addons: List[dict], cart_id: str=None, l
             try:
                 cm = CartManager(event=event, cart_id=cart_id, invoice_address=ia, sales_channel=sales_channel)
                 cm.set_addons(addons)
+                cm.add_new_items(add_to_cart_items)
                 cm.commit()
             except LockTimeoutException:
                 self.retry()