langchain

0f7b8add - fix issue: cannot use document_variable_name to override context in create_stuff_documents_chain (#25531)

fix issue: cannot use document_variable_name to override context in create_stuff_documents_chain (#25531) …he prompt in the create_stuff_documents_chain Thank you for contributing to LangChain! - [ ] **PR title**: "langchain:add document_variable_name in the function _validate_prompt in create_stuff_documents_chain" - [ ] **PR message**: - **Description:** add document_variable_name in the function _validate_prompt in create_stuff_documents_chain - **Issue:** according to the description of create_stuff_documents_chain function, the parameter document_variable_name can be used to override the "context" in the prompt, but in the function, _validate_prompt it still use DOCUMENTS_KEY to check if it is a valid prompt, the value of DOCUMENTS_KEY is always "context", so even through the user use document_variable_name to override it, the code still tries to check if "context" is in the prompt, and finally it reports error. so I use document_variable_name to replace DOCUMENTS_KEY, the default value of document_variable_name is "context" which is same as DOCUMENTS_KEY, but it can be override by users. - **Dependencies:** none - **Twitter handle:** https://x.com/xjr199703 - [ ] **Add tests and docs**: none - [ ] **Lint and test**: Run `make format`, `make lint` and `make test` from the root of the package(s) you've modified. See contribution guidelines for more: https://python.langchain.com/docs/contributing/ Additional guidelines: - Make sure optional dependencies are imported within a function. - Please do not add dependencies to pyproject.toml files (even optional ones) unless they are required for unit tests. - Most PRs should not touch more than one package. - Changes should be backwards compatible. - If you are adding something to community, do not re-import it in langchain. If no one reviews your PR within a few days, please @-mention one of baskaryan, efriis, eyurtsev, ccurme, vbarda, hwchase17. --------- Co-authored-by: Chester Curme <chester.curme@gmail.com>