rewrite service layer to take primitives [service_takes_primitives]

Author: hjwp

service_layer/services.py

@@ -13,7 +13,11 @@ def is_valid_sku(sku, batches):
     return sku in {b.sku for b in batches}
 
 
-def allocate(line: OrderLine, repo: AbstractRepository, session) -> str:
+def allocate(
+    orderid: str, sku: str, qty: int,
+    repo: AbstractRepository, session
+) -> str:
+    line = OrderLine(orderid, sku, qty)
     batches = repo.list()
     if not is_valid_sku(line.sku, batches):
         raise InvalidSku(f"Invalid sku {line.sku}")