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You need to split a document into chunks while ensuring each chunk's metadata includes the original page number it came from. How can you achieve this in Langchain?

hard📝 Application Q8 of 15
LangChain - Text Splitting
You need to split a document into chunks while ensuring each chunk's metadata includes the original page number it came from. How can you achieve this in Langchain?
ASplit the document first, then assign page numbers to chunks randomly
BUse the splitter's built-in parameter to automatically add page numbers
CManually add the page number to each Document's metadata before splitting
DMetadata cannot be customized during splitting in Langchain
Step-by-Step Solution
Solution:

  1. Step 1: Assign page numbers

    Before splitting, add the page number to each Document's metadata.

  2. Step 2: Split documents

    When splitting, Langchain preserves existing metadata, so page numbers remain attached to chunks.

  3. Final Answer:

    Manually add the page number to each Document's metadata before splitting -> Option C

  4. Quick Check:

    Pre-assign metadata to preserve it [OK]
Quick Trick: Add metadata before splitting to keep it [OK]
Common Mistakes:
  • Expecting splitter to auto-add page numbers
  • Assigning metadata after splitting
  • Believing metadata customization is unsupported

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