Fixed async generator crash

ingredients/__init__.py

@@ -65,8 +65,13 @@ def parse_ingredient_from_nlp(ingredient_string: str) -> Ingredient:
     )
 
 async def _find_existing_product(conn, ingredient: str) -> Product:
-    async for item in find_product_by_tag(conn, ingredient):
+    gen = find_product_by_tag(conn, ingredient)
+    try:
+        async for item in gen:
             return item
+    finally:
+        await gen.aclose()
+
     return None
 
 async def match_existing_products(conn, ingredients: List[Ingredient]) -> List[Ingredient]:

products/__init__.py

@@ -16,10 +16,7 @@ def _get_shop_key(link: str) -> Union[str, str]: # (shop_code, product_id)
     return None, None
 
 async def add_missing_tags(conn, product: Product, tags: List[str]):
-    existing_tags = set()
-    async for tag in get_tags(conn, product):
-        existing_tags.add(tag)
-    
+    existing_tags = {tag async for tag in get_tags(conn, product)}
     remaining_tags = set(tags) - existing_tags
     if not remaining_tags:
         return False

shopping/db.py

@@ -80,15 +80,12 @@ def validate_request(request: ShoppingListItem) -> None:
         raise ValueError('Request must have either an ingredient or a meal')
 
 async def purchase(conn, shopping_list: ShoppingList) -> None:
-    if shopping_list.purchased_by_id is None:
+    if shopping_list.purchased_by_id is None or shopping_list.purchased_by_id < 0:
         raise ValueError('Shopping list must have a person id')
     
     if shopping_list.items is None or len(shopping_list.items) == 0:
         raise ValueError('Shopping list must have items')
     
-    if shopping_list.purchased_by_id < 0:
-        raise ValueError('Shopping list must have a valid person id')
-
     shopping_list.created_date = datetime.now().astimezone()
 
     async with conn.execute('''