Fix: Could not open bill with bill number or voucher id

barker/barker/routers/voucher/show.py

@@ -59,7 +59,8 @@ def from_id(
                 ProductVersion.valid_till >= Voucher.date,
             ),
         )
-        item: Voucher = db.execute(
+        item: Voucher = (
+            db.execute(
                 select(Voucher)
                 .join(Voucher.food_table)
                 .join(Voucher.customer, isouter=True)
@@ -77,7 +78,10 @@ def from_id(
                     .contains_eager(Inventory.product)
                     .contains_eager(Product.versions),
                 )
-        ).scalar_one()
+            )
+            .unique()
+            .scalar_one()
+        )
         return voucher_info(item, db)
 
 
@@ -104,7 +108,8 @@ def from_bill(
                 status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
                 detail="Bill Number is invalid",
             )
-        item: Voucher | None = db.execute(
+        item: Voucher | None = (
+            db.execute(
                 select(Voucher)
                 .join(Voucher.bills)
                 .join(Bill.regime)
@@ -125,7 +130,10 @@ def from_bill(
                     .contains_eager(Product.versions),
                     contains_eager(Voucher.bills).contains_eager(Bill.regime),
                 )
-        ).scalar_one_or_none()
+            )
+            .unique()
+            .scalar_one_or_none()
+        )
         if item is None:
             raise HTTPException(
                 status_code=status.HTTP_404_NOT_FOUND,
@@ -192,8 +200,7 @@ def from_table(
                         )
                     )
                     .unique()
-                    .scalars()
-                    .one()
+                    .scalar_one()
                 )
 
                 if guest is not None: