langchain/templates/research-assistant/research_assistant/chain.py

from langchain.pydantic_v1 import BaseModel
from langchain.schema.runnable import RunnablePassthrough

from research_assistant.search.web import chain as search_chain
from research_assistant.writer import chain as writer_chain

chain_notypes = (
    RunnablePassthrough().assign(research_summary=search_chain) | writer_chain
)


class InputType(BaseModel):
    question: str


chain = chain_notypes.with_types(input_type=InputType)