Bird
0
0

You wrote this code but get an error: AttributeError: 'dict' object has no attribute 'metadata'. What is the likely cause?

medium📝 Debug Q6 of 15
LangChain - RAG Chain Construction
You wrote this code but get an error: AttributeError: 'dict' object has no attribute 'metadata'. What is the likely cause?
source = response['source_documents'][0].metadata['source']
AThe response variable is empty.
BThe 'source' key does not exist in metadata.
CYou forgot to import Langchain Document class.
Dresponse['source_documents'][0] is a dict, not a Document object.
Step-by-Step Solution
Solution:

  1. Step 1: Analyze the error message

    AttributeError means the object is a dict, which lacks 'metadata' attribute.

  2. Step 2: Identify the cause in response structure

    response['source_documents'][0] is a dict, so accessing .metadata fails.

  3. Final Answer:

    response['source_documents'][0] is a dict, not a Document object. -> Option D

  4. Quick Check:

    Dict object has no metadata attribute = response['source_documents'][0] is a dict, not a Document object. [OK]
Quick Trick: Check if source_documents are dicts or Document objects [OK]
Common Mistakes:
  • Assuming metadata key missing causes AttributeError
  • Blaming missing imports for this error
  • Thinking empty response causes AttributeError

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More LangChain Quizzes
Conversational RAG - Question reformulation with history - Quiz 7medium Conversational RAG - Question reformulation with history - Quiz 8hard Document Loading - Loading PDFs with PyPDFLoader - Quiz 12easy Document Loading - Custom document loaders - Quiz 14medium Embeddings and Vector Stores - Chroma vector store setup - Quiz 10hard RAG Chain Construction - Multi-query retrieval for better recall - Quiz 7medium RAG Chain Construction - Hybrid search (keyword + semantic) - Quiz 2easy RAG Chain Construction - Multi-query retrieval for better recall - Quiz 5medium RAG Chain Construction - Context formatting and injection - Quiz 8hard Text Splitting - Why chunk size affects retrieval quality - Quiz 2easy