make return value of crud.put_item easier to understand

crud.py

@@ -1,3 +1,4 @@
+from enum import Enum
 
 from sqlalchemy import DECIMAL, cast
 from sqlalchemy.orm import Session
@@ -17,7 +18,15 @@ def put_item(db: Session, id: str, item: schemas.Item):
     if not updated:
         db.add(models.Item(**item.dict()))
     db.commit()
-    return updated
+    if updated:
+        return PutItemResult.UPDATED
+    else:
+        return PutItemResult.ADDED
+
+
+class PutItemResult(Enum):
+    ADDED = 1
+    UPDATED = 2
 
 
 def delete_item(db: Session, id: str):

main.py

@@ -44,7 +44,7 @@ async def list_items(db: Session = Depends(get_db)):
 
 @app.put("/api/items/{id}")
 async def put_item(id: str, item: Item, db: Session = Depends(get_db)):
-    if crud.put_item(db, id, item):
+    if crud.put_item(db, id, item) == crud.PutItemResult.UPDATED:
         return Response(b"", status_code=204)
     return Response(b"", status_code=201)