update node state

[Mahdi-Ba]

I have two nodes, A and B. In Node A, I return {'state': 'pending'}, and I want Node B to return {'state': 'finish'}. However, I'm encountering an issue.
langgraph.errors.InvalidUpdateError: Invalid update for channel state with values ['pending', 'finish']
I tried changing the structure like this, but I still have the same issue.
{"state": "pending=finish"}

[vbarda]

the update from the node should contain one of the state keys -- "pending" or "finish", it looks like there is no key "state" in the schema. so depending on your schema, it can look something like

class State(TypedDict):
    pending: bool
    finish: bool

def node_a(state):
    ...
    return {"pending": True}

[Mahdi-Ba]

These are my state but lang_graph doesn't support updating state.Your solution is a common way thank you

class StatusEnum(str, Enum):
    ACTIVE = "active"
    INACTIVE = "inactive"
    PENDING = "pending"
    PENDING_HUMAN_DECISION = "pending_human_decision"
    COMPLETED = "completed"


class GraphState(TypedDict):
    _id: Optional[str] = None
    question: Optional[str] = None
    strip: Optional[str] = None
    response: Optional[str] = None
    status: StatusEnum

I find out that instead return the dict I change it to state['status'] = StatusEnum.COMPLETED in body of method of But isn't a good solution

[vbarda]

ah, can you just return {"status": StatusEnum.COMPLETED} from your node function?

[Mahdi-Ba]

Yes , because this action set/write state if there isn't key and trigger in background