mirror of
https://github.com/hwchase17/langchain
synced 2024-11-08 07:10:35 +00:00
73 lines
2.0 KiB
Python
73 lines
2.0 KiB
Python
from typing import Optional, Type
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from langchain.callbacks.manager import (
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AsyncCallbackManagerForToolRun,
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CallbackManagerForToolRun,
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)
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# Import things that are needed generically
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from langchain.pydantic_v1 import BaseModel, Field
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from langchain.tools import BaseTool
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from neo4j_semantic_layer.utils import get_candidates, get_user_id, graph
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store_rating_query = """
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MERGE (u:User {userId:$user_id})
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WITH u
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UNWIND $candidates as row
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MATCH (m:Movie {title: row.candidate})
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MERGE (u)-[r:RATED]->(m)
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SET r.rating = toFloat($rating)
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RETURN distinct 'Noted' AS response
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"""
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def store_movie_rating(movie: str, rating: int):
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user_id = get_user_id()
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candidates = get_candidates(movie, "movie")
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if not candidates:
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return "This movie is not in our database"
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response = graph.query(
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store_rating_query,
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params={"user_id": user_id, "candidates": candidates, "rating": rating},
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)
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try:
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return response[0]["response"]
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except Exception as e:
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print(e) # noqa: T201
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return "Something went wrong"
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class MemoryInput(BaseModel):
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movie: str = Field(description="movie the user liked")
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rating: int = Field(
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description=(
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"Rating from 1 to 5, where one represents heavy dislike "
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"and 5 represent the user loved the movie"
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)
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)
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class MemoryTool(BaseTool):
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name = "Memory"
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description = "useful for memorizing which movies the user liked"
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args_schema: Type[BaseModel] = MemoryInput
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def _run(
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self,
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movie: str,
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rating: int,
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run_manager: Optional[CallbackManagerForToolRun] = None,
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) -> str:
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"""Use the tool."""
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return store_movie_rating(movie, rating)
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async def _arun(
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self,
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movie: str,
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rating: int,
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run_manager: Optional[AsyncCallbackManagerForToolRun] = None,
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) -> str:
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"""Use the tool asynchronously."""
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return store_movie_rating(movie, rating)
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