Makes GraphStore a Protocol

[alexthomas93]

Description

Previously, the GraphStore abstract base class lived in the LangChain Community package, allowing other graph DB vendors to inherit from it and build integrations for LangChain. We have now moved this class to the LangChain Neo4j package. We also require the graph passed to the GraphCypherQAChain to be a GraphStore. This means that other graph DB vendors must now inherit from the GraphStore class in the LangChain Neo4j package in order to be compatible with the GraphCypherQAChain.

This PR changes the GraphStore class to a Protocol, which allows other graph integrations to work with the GraphCypherQAChain without the explicit need to inherit from the GraphStore class in the LangChain Neo4j package.

Type of Change

• New feature
• Bug fix
• Breaking change
• Project configuration change

Complexity

Low

How Has This Been Tested?

• Unit tests
• Integration tests
• Manual tests

Checklist

• Unit tests updated
• Integration tests updated
• CHANGELOG.md updated

[alexthomas93]

@CodiumAI-Agent /update_changelog

[CodiumAI-Agent]

Changelog updates: 🔄

2025-01-10

Changed

• Updated GraphStore to be a Protocol, enabling compatibility with GraphCypherQAChain without requiring inheritance.

to commit the new content to the CHANGELOG.md file, please type:
'/update_changelog --pr_update_changelog.push_changelog_changes=true'

[stellasia]

Nice one!