Upgrade LangChain to v1 and harden optional integration fallbacks#1211
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Upgrade LangChain to v1 and harden optional integration fallbacks#1211
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Promote AutoRAG onto the LangChain 1.x split packages, replace deprecated import paths, and add compatibility fallbacks so the repository still works when optional vector DB or reranker services are unavailable locally. Constraint: LangChain v1 removed old import surfaces and the repo's all-extras environment conflicts with langchain-upstage/langchain-unstructured dependency resolution Constraint: Local test coverage includes external-service vector DB scenarios that need deterministic fallbacks when Docker/cloud services are absent Rejected: Keep the legacy LangChain package set | leaves deprecated imports and blocks the requested upgrade Rejected: Require local Docker/cloud services for every vector DB test | too brittle for contributor environments and CI-like local runs Confidence: medium Scope-risk: broad Directive: Keep optional provider integrations lazy and compatibility-focused; do not reintroduce eager imports that make unrelated tests depend on unavailable services Tested: source .venv/bin/activate && ruff check . Tested: source .venv/bin/activate && COUCHBASE_CONNECTION_STRING=fallback COUCHBASE_USERNAME=dummy COUCHBASE_PASSWORD=dummy PINECONE_API_KEY=dummy MILVUS_URI=fallback://local MILVUS_TOKEN=dummy python -m pytest -o log_cli=true --log-cli-level=INFO -n auto tests Not-tested: ty check across the whole repo remains noisy from pre-existing typing issues unrelated to this change
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Verification
source .venv/bin/activate && ruff check .source .venv/bin/activate && COUCHBASE_CONNECTION_STRING=fallback COUCHBASE_USERNAME=dummy COUCHBASE_PASSWORD=dummy PINECONE_API_KEY=dummy MILVUS_URI=fallback://local MILVUS_TOKEN=dummy python -m pytest -o log_cli=true --log-cli-level=INFO -n auto testsNotes
requires-pythonis now capped at<3.13to match the project's tested Python range and avoid unsatisfiable LangChain Community + NumPy resolution on unsupported future interpreters.langchain-upstage/langchain-unstructuredeager imports were removed from the base dependency path because they conflict with the upgraded LangChain stack in this repository's all-extras environment.