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Changelog

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0.10.0

Added

  • DataIngestionNotSupported exception to be raised when trying to ingest data to a relationship index.
  • LLMGraphTransformer for converting text documents into graph documents using an LLM, migrated from langchain-experimental.

Changed

  • Skipped removal of id property from search query results, this field can now present in retrieved documents' metadata.

Fixed

  • Replaced deprecated apoc.create.addLabels with native Cypher dynamic label assignment in Neo4jGraph.

0.9.0

Added

  • Added LangChain-specific user-agent metadata to Neo4j driver initialization across graph, vectorstore, and checkpoint integrations.

Fixed

  • Fixed GraphCypherQAChain compatibility with non-Neo4j GraphStore implementations (for example AGEGraph) by not requiring the private _enhanced_schema attribute.

0.8.0

Added

  • Added Neo4jSaver, a synchronous checkpoint saver for persisting LangGraph graph state in Neo4j.
  • Added AsyncNeo4jSaver, an asynchronous checkpoint saver for persisting LangGraph graph state in Neo4j.

0.7.0

Added

  • Added bearer token auth support to Neo4jGraph (via token).
  • Added support for Python 3.14.
  • Added support for Neo4j Python Driver v6.0.0+.

Changed

  • Switched project/dependency management from Poetry to uv.
  • Updated docstrings/reference-doc formatting for the new LangChain reference docs site (MkDocs/Markdown).
  • CI/CD workflows now test with Python 3.14.

Fixed

  • Neo4jVector now handles missing metadata in retrieval results.
  • Fixed Neo4jVector.from_existing_index retrieval query generation when using multiple text_node_properties.
  • Fixed issue with Neo4jChatMessageHistory using database rather than database_ in its execute_query calls.

0.6.0

Added

  • Added langchain-classic as a dependency.

Changed

  • Removed langchain as a dependency.
  • Removed support for Python 3.9 as langchain-classic no longer supports it.
  • CI/CD workflows now test Python versions 3.10 to 3.13 in line with other LangChain integrations.
  • Bumped langchain-core dependency version from ^0.3.39 to ^1.0.0

0.5.0

Added

  • Added support for specifying custom database names in Neo4jChatMessageHistory (not limited to the default "neo4j").
  • Introduced an optional mmr dependency group for maximal marginal relevance search dependencies.
  • Included numpy in the mmr dependency group.

Changed

  • Bumped neo4j-graphrag dependency version from ^1.5.0 to ^1.9.0.

Fixed

  • Prevented infinite loops in CypherQueryCorrector.extract_paths whenever there was a repeated path in a Cypher query.
  • Replaced direct result["text"] indexing with result.get("text") in Neo4jVector.similarity_search_with_score_by_vector, so missing text fields are handled gracefully instead of raising errors.
  • Changed an empty-list check in CypherQueryCorrector.detect_node_variables so that nodes without an explicit variable are properly skipped instead of misclassifying all labels under an empty variable.
  • Stopped Neo4jChatMessageHistory from creating duplicate session nodes.
  • Schema bug in Neo4jGraph when enhance_schema=True where relationships with boolean properties triggered a malformed RETURN {} AS output Cypher query and prevented graph initialization.
  • Ensured custom DB names are passed through to retrieve_vector_index_info and retrieve_existing_fts_index in Neo4jVector.

0.4.0

Changed

  • Renamed the type property to role on Message nodes in Neo4jChatMessageHistory.
  • Updated GraphCypherQAChain to use the same schema format as Neo4jGraph.
  • Replaced code used to query vector and full text indexes in the vectorstores.neo4j_vector module with equivalents from the neo4j-graphrag package.
  • Replaced database schema retrieval code in the graphs.neo4j_graph module with equivalents from the neo4j-graphrag package.
  • Replaced the Cypher queries in Neo4jChatMessageHistory with equivalents from the neo4j-graphrag package.
  • Updated the construct_schema function used by the GraphCypherQAChain to use schema retrieval functions from the neo4j-graphrag package.
  • Replaced the legacy extract_cypher function with the improved version from neo4j-graphrag package.

Added

  • Introduced a delete_session_node parameter to the clear method in Neo4jChatMessageHistory for optional deletion of the Session node.
  • Added neo4j-graphrag to the dependencies.

0.3.0

Added

  • Optional parameter to specify embedding dimension in Neo4jVector, avoiding the need to query the embedding model.

Changed

  • Made the source parameter of GraphDocument optional and updated related methods to support this.
  • Suppressed AggregationSkippedNull warnings raised by the Neo4j driver in the Neo4jGraph class when fetching the enhanced_schema.
  • Modified the Neo4jGraph class's enhanced schema Cypher query to utilize the apoc.meta.graph procedure instead of apoc.meta.graphSample.
  • Updated GraphStore to be a Protocol, enabling compatibility with GraphCypherQAChain without requiring inheritance.

Fixed

  • Resolved syntax errors in GraphCypherQAChain by ensuring node labels with spaces are correctly quoted in Cypher queries.
  • Added missing Lucene special character '/' to the list of characters escaped in remove_lucene_chars.

0.2.0

Added

  • Enhanced Neo4j driver connection management with more robust error handling.
  • Simplified connection state checking in Neo4jGraph.
  • Introduced effective_search_ratio parameter in Neo4jVector to enhance query accuracy by adjusting the candidate pool size during similarity searches.

Fixed

  • Removed deprecated LLMChain from GraphCypherQAChain to resolve instantiation issues with the use_function_response parameter.
  • Removed unnecessary # type: ignore comments, improving type safety and code clarity.

0.1.1

Changed

  • Removed dependency on LangChain Community package by integrating necessary components directly into the LangChain Neo4j codebase.

Updated

  • Fixed bugs in the Neo4jVector and GraphCypherQAChain classes preventing these classes from working with versions < 5.23 of Neo4j.

0.1.0

Added

  • Migrated all Neo4j-related code, including tests and integration tests, from the LangChain Community package to this package.