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You want to split a document and add a unique chunk ID to each chunk's metadata. How can you do this efficiently in Langchain?

hard📝 Application Q9 of 15
LangChain - Text Splitting
You want to split a document and add a unique chunk ID to each chunk's metadata. How can you do this efficiently in Langchain?
AReplace metadata with chunk index during splitting
BSet 'chunk_id' in the original document metadata before splitting
CUse a splitter parameter to auto-generate chunk IDs
DSplit the document, then iterate chunks to add 'chunk_id' in metadata
Step-by-Step Solution
Solution:

  1. Step 1: Recognize that splitter does not auto-add chunk IDs

    Langchain splitters do not generate unique IDs automatically.

  2. Step 2: Add unique IDs after splitting

    After splitting, iterate over chunks and add a 'chunk_id' key to each chunk's metadata.

  3. Final Answer:

    Split the document, then iterate chunks to add 'chunk_id' in metadata -> Option D

  4. Quick Check:

    Post-split metadata update adds IDs [OK]
Quick Trick: Add IDs after splitting by looping chunks [OK]
Common Mistakes:
  • Trying to set chunk_id before splitting
  • Expecting splitter to auto-generate IDs
  • Replacing metadata instead of updating

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