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How can you combine Langchain's hybrid search with a custom filter to only return documents from 2023?

hard📝 Application Q9 of 15
LangChain - RAG Chain Construction
How can you combine Langchain's hybrid search with a custom filter to only return documents from 2023?
AUse hybrid search retriever with a filter function checking document metadata year
BApply filter after retrieving documents with pure keyword search only
CSet keyword_weight to zero and rely on semantic search only
DUse a different retriever that does not support filtering
Step-by-Step Solution
Solution:

  1. Step 1: Understand filtering in Langchain retrievers

    Retrievers can accept filter functions to limit results by metadata.

  2. Step 2: Combine filter with hybrid search

    Pass a filter function to hybrid search retriever to restrict documents by year 2023.

  3. Final Answer:

    Use hybrid search retriever with a filter function checking document metadata year -> Option A

  4. Quick Check:

    Filter + hybrid search = filtered relevant docs [OK]
Quick Trick: Use filter functions with hybrid retriever for metadata limits [OK]
Common Mistakes:
  • Filtering only after keyword search
  • Ignoring filter support in hybrid retriever
  • Setting keyword_weight to zero disables filtering

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