Fix potential NoneType error

[seehi]

User description

Features

• Fix potential NoneType error
• Update comment in rag_pipeline example

Feature Docs

Influence

Result

Other

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PR Type

bug_fix

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Description

• Added null checks to prevent NoneType errors when self._index is None in BM25Retriever.
• Ensures that methods insert_nodes and persist are only called if self._index is not None, enhancing the robustness of the code.

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Changes walkthrough 📝

	Relevant files
Bug fix	bm25_retriever.py Add null checks for `self._index` in BM25Retriever              metagpt/rag/retrievers/bm25_retriever.py Added checks to ensure self._index is not None before calling insert_nodes and persist. +4/-2

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PR Description updated to latest commit (d4c0678)

• Copy walkthrough table to "Files Changed" Tab

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PR Review 🔍

⏱️ Estimated effort to review [1-5]	2, because the changes are straightforward and localized to null checks in two methods. The logic is simple and the amount of changed code is minimal.
🧪 Relevant tests	No
⚡ Possible issues	Possible Bug: The PR does not address what should happen if self._index is None beyond skipping the operations. It might be beneficial to log a warning or handle this case more explicitly.
🔒 Security concerns	No

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PR Code Suggestions ✨

Category	Suggestions
Possible issue	Ensure that self._index is valid before using it. Consider checking if self._index is not only non-null but also fully initialized or valid before calling methods on it. This can prevent runtime errors if self._index is in an unexpected state. metagpt/rag/retrievers/bm25_retriever.py [43-44] -if self._index: +if self._index and self._index.is_valid(): self._index.insert_nodes(nodes, **kwargs)
Enhancement	Validate the persist_dir argument before using it. To avoid potential issues with the persist_dir argument not being a string or being malformed, validate the persist_dir before using it in the persist method. metagpt/rag/retrievers/bm25_retriever.py [48-49] -if self._index: +if self._index and isinstance(persist_dir, str) and os.path.isdir(persist_dir): self._index.storage_context.persist(persist_dir)

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.23%. Comparing base (f201b2f) to head (53369ee).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1247   +/-   ##
=======================================
  Coverage   70.22%   70.23%           
=======================================
  Files         316      316           
  Lines       18860    18862    +2     
=======================================
+ Hits        13245    13248    +3     
+ Misses       5615     5614    -1     

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[geekan]

then it will

[seehi]

fixed