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Lorenzo 00a7c31ffd Fix: Nested Dicts Handling of Document Metadata (#9880) ... ## Description When the `MultiQueryRetriever` is used to get the list of documents relevant according to a query, inside a vector store, and at least one of these contain metadata with nested dictionaries, a `TypeError: unhashable type: 'dict'` exception is thrown. This is caused by the `unique_union` function which, to guarantee the uniqueness of the returned documents, tries, unsuccessfully, to hash the nested dictionaries and use them as a part of key. ```python unique_documents_dict = { (doc.page_content, tuple(sorted(doc.metadata.items()))): doc for doc in documents } ``` ## Issue #9872 (MultiQueryRetriever (get_relevant_documents) raises TypeError: unhashable type: 'dict' with dic metadata) ## Solution A possible solution is to dump the metadata dict to a string and use it as a part of hashed key. ```python unique_documents_dict = { (doc.page_content, json.dumps(doc.metadata, sort_keys=True)): doc for doc in documents } ``` --------- Co-authored-by: Bagatur <baskaryan@gmail.com>		1 year ago
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langchain	Fix: Nested Dicts Handling of Document Metadata (#9880)	1 year ago