How to convert onFinish data back to initial message for useChat?

[joel611]

I would like to save all messages into database and restore the history including tool steps to exactly before user left.
the value from onFinish is not convertible to the form of initialMessages, such as no toolInvocations.

Sample code:

await streamText({
  message: converToCoremessage(message),
  ...
  async onFinish({responseMessages) {
    await saveChat({
      chatId: params.id
      response: responseMessages
    })
  }
})

const history = getHistory(params.id);

const {messages} = useChat({
    initialMessages: history
})

[joel611]

oh sorry, i just found solution from other thread.
#2013 (reply in thread)