Fix: Check field is allowed before updating

src/transpose/transpose.py

@@ -111,7 +111,7 @@ class TransposeConfig:
 
     def update(self, name: str, field_key: str, field_value: Any) -> None:
         """
-        Update an entry by name
+        Update an entry's field (attribute) value
 
         Args:
             name: The name of the entry (must exist)
@@ -122,10 +122,13 @@ class TransposeConfig:
             None
         """
         try:
-            setattr(self.entries[name], field_key, field_value)
+            if not hasattr(self.entries[name], field_key):
+                raise TransposeError(f"Unknown TransposeEntry field: {field_key}")
         except KeyError:
             raise TransposeError(f"'{name}' does not exist in Transpose config entries")
 
+        setattr(self.entries[name], field_key, field_value)
+
     @staticmethod
     def load(config_path: str):  # -> Self:
         try:

tests/test_transpose.py

@@ -196,6 +196,9 @@ def test_config_update():
     ):
         config.update("UnknownEntry", "path", "/some/new/path")
 
+    with pytest.raises(TransposeError, match="Unknown TransposeEntry field"):
+        config.update(ENTRY_NAME, "UnknownField", "Some Value")
+
     config.update(ENTRY_NAME, "path", "/some/new/path")
     assert config.entries[ENTRY_NAME].path == "/some/new/path"