fix: enforce attribute validation in VertexAISearchRetriever (#246)

Co-authored-by: Amanda <[email protected]>

libs/community/langchain_google_community/vertex_ai_search.py

@@ -252,7 +252,7 @@ class VertexAISearchRetriever(BaseRetriever, _BaseVertexAISearchRetriever):
  class Config:
  """Configuration for this pydantic object."""
 
- extra = Extra.ignore
+ extra = Extra.forbid
  arbitrary_types_allowed = True
  underscore_attrs_are_private = True
 
@@ -267,7 +267,11 @@ def __init__(self, **kwargs: Any) -> None:
  "`pip install langchain-google-community[vertexaisearch]`"
  ) from exc
 
- super().__init__(**kwargs)
+ try:
+ super().__init__(**kwargs)
+ except ValueError as e:
+ print(f"Error initializing GoogleVertexAISearchRetriever: {str(e)}")
+ raise
 
  # For more information, refer to:
  # https://cloud.google.com/generative-ai-app-builder/docs/locations#specify_a_multi-region_for_your_data_store