langchain.js
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    Class XataChatMessageHistory<XataClient>

    A class for managing chat message history using Xata.io client. It extends the BaseListChatMessageHistory class and provides methods to get, add, and clear messages. It also ensures the existence of a table where the chat messages are stored.

    const chatHistory = new XataChatMessageHistory({
      table: "messages",
      sessionId: new Date().toISOString(),
      client: new BaseClient({
        databaseURL: process.env.XATA_DB_URL,
        apiKey: process.env.XATA_API_KEY,
        branch: "main",
      }),
      apiKey: process.env.XATA_API_KEY,
    });

    const chain = new ConversationChain({
      llm: new ChatOpenAI({ model: "gpt-4o-mini" }),
      memory: new BufferMemory({ chatHistory }),
    });

    const response = await chain.invoke({
      input: "What did I just say my name was?",
    });
    console.log({ response });

    Type Parameters

    • XataClient extends BaseClient

    Hierarchy (View Summary)

    Index

    Constructors

    constructor

    Properties

    client lc_namespace

    Methods

    addMessage clear getMessages

    Constructors

    Properties

    client: XataClient
    lc_namespace: string[] = ...

    Methods

    • Adds a new message to the database.

      Parameters

      • message: BaseMessage

        The BaseMessage instance to be added.

      Returns Promise<void>

      A promise that resolves when the message has been added.

    • Deletes all messages associated with the session ID.

      Returns Promise<void>

      A promise that resolves when the messages have been deleted.

    • Retrieves all messages associated with the session ID, ordered by creation time.

      Returns Promise<BaseMessage[]>

      A promise that resolves to an array of BaseMessage instances.

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