AttributeError: 'JsonPlusRedisSerializer' object has no attribute '_default' #115
Description
Problem
I saw the previous fix on JsonPlusRedisSerializer and replaced the dumps function with this:
def dumps(self, obj: Any) -> bytes:
"""Use orjson for serialization with LangChain object support via default handler."""
# Use orjson with default handler for LangChain objects
# The _default method from parent class handles LangChain serialization
return orjson.dumps(obj, default=self._default)Error : AttributeError: 'JsonPlusRedisSerializer' object has no attribute '_default'
And it is not being inherited from JsonPlusSerializer in langgraph/checkpoint/serde/jsonplus.py either, which I am assuming was the case previously.
These are my dependencies:
dependencies = [
"langchain>=1.0.3",
"langchain-community>=0.4.1",
"langgraph>=1.0.2",
"langsmith>=0.4.40",
"msgpack>=1.1.2",
"redis>=7.0.1",
]
I got this fix which does work from my side:
from langchain_core.messages import BaseMessage
def _default(self, o):
"""Fallback handler for un-serializable orjson objects."""
if isinstance(o, BaseMessage):
return {
"lc": 1,
"type": "constructor",
"id": ["langchain", "schema", "messages", o.__class__.__name__],
"kwargs": o.__dict__, # or o.dict() if available
}
raise TypeError(f"Object of type {type(o)} is not JSON serializable")If it is not too much of a trouble can the maintainers please look into it
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