[UPD] Exception handling

app/controller/functions/__init__.py

@@ -0,0 +1 @@
+from .update_item_key import update_item_key

app/controller/functions/update_item_key.py

@@ -0,0 +1,21 @@
+from ..exceptions import LibraryDataExection
+from ...schema.library import Base
+
+def update_item_key(obj:Base, key, value):
+    if key == "id":
+        raise LibraryDataExection(
+            "id is not updatable",
+            "The key ID is not Updatable",
+            obj.__class__,
+            {key: value}
+        )
+    try:
+        obj.__getattribute__(key)
+    except AttributeError:
+        raise LibraryDataExection(
+            f"{key} not in {obj.__class__}",
+            f"The key {key} is not in {obj.__class__}",
+            obj.__class__,
+            {key: value}
+        )
+    obj.__setattr__(key, value)