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community: fix neo4j from_existing_graph (#24912)

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Fixes Neo4JVector.from_existing_graph integration with huggingface

Previously threw an error with existing databases, because
from_existing_graph query returns empty list of new nodes, which are
then passed to embedding function, and huggingface errors with empty
list.

Fixes [24401](https://github.com/langchain-ai/langchain/issues/24401)

---------

Co-authored-by: Jeff Katzy <jeffreyerickatz@gmail.com>
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jigsawlabs-student 2024-08-05 17:01:46 -04:00 committed by GitHub
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libs/community/langchain_community/vectorstores/neo4j_vector.py
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@ -1449,6 +1449,8 @@ class Neo4jVector(VectorStore):
"LIMIT 1000" "LIMIT 1000"
) )
data = store.query(fetch_query, params={"props": text_node_properties}) data = store.query(fetch_query, params={"props": text_node_properties})
if not data:
break
text_embeddings = embedding.embed_documents([el["text"] for el in data]) text_embeddings = embedding.embed_documents([el["text"] for el in data])
params = { params = {