router.get("/:ticketid", async (req, res) => {
    try {
        const ticket = await ticketTable.findByPk(req.params.ticketid);

        const severityTimeSpaninMinutes = {
            "Severity 1 - Critical Business Impact": 1 * 60 * 24,
            "Severity 2 - Significant Business Impact": 3 * 60 * 24,
            "Severity 3 - Some Business Impact": 90 * 60 * 24,
            "Severity 4 - Minimal Business Impact": 91 * 60 * 24
        }

        if (ticket) {
            //  check if time until caseSubmittedDate is more than 1 day
            const timeUntilCaseSubmittedDate = dayjs(ticket.caseSubmittedDate).diff(dayjs(), 'minute')
            //  if yes, then update the ticketSLA to "Not Met"
            if (timeUntilCaseSubmittedDate < -severityTimeSpaninMinutes[ticket.priority]) {
                await ticketTable.update({
                    ticketSLA: "Not Met"
                }, {
                    where: {
                        tID: ticket.tID
                    }
                })
            }
            // get attachments based on R_TID
            const attachments = await attachmentTable.findAll({
                where: {
                    R_ID: ticket.tID,
                    columnName: "Requestor"
                }
            })

            res.json({
                data: { ...ticket.toJSON(), attachments },
                statusCode: 200,
                statusMessage: `Successfully fetched ${ticket.toJSON().ticketNo}`
            })
        } else {
            res.status(400).json({
                statusCode: 400,
                statusMessage: "Missing Ticket"
            })
        }
    } catch (err) {
        return res.status(500).json({
            statusCode: 500,
            statusMessage: err.message
        })
    }
})

这里ticket存储在开始时使用sequelize从票据表获取的特定项目
并且在表的if条件中发生了更新。
令我惊讶的是，data: { ...ticket.toJSON(), attachments },中的ticket会自动从表中获取更新后的值，尽管它是在更新之前定义的。
这是怎么回事？