LangChain Reference home pageLangChain ReferenceLangChain Reference
  • GitHub
  • Main Docs
Deep Agents
LangChain
LangGraph
Integrations
LangSmith
  • Overview
  • LangGraph Checkpoint
    LangGraph Store
    Checkpoint Postgres
    Store Postgres
    Checkpoint SQLite
    LangGraph Prebuilt
    LangGraph CLI
    LangGraph SDK
    LangGraph Supervisor
    LangGraph Swarm
    ⌘I

    LangChain Assistant

    Ask a question to get started

    Enter to send•Shift+Enter new line

    Menu

    LangGraph Checkpoint
    LangGraph Store
    Checkpoint Postgres
    Store Postgres
    Checkpoint SQLite
    LangGraph Prebuilt
    LangGraph CLI
    LangGraph SDK
    LangGraph Supervisor
    LangGraph Swarm
    Language
    Theme
    Pythonlanggraph-sdkauthtypesIfNotExists
    Attribute●Since v0.1

    IfNotExists

    Copy
    IfNotExists = typing.Literal['create', 'reject']
    View source on GitHub

    Behavior when an entity doesn't exist.

    Values:

    • create: Create the entity
    • reject: Reject the operation