https://developers.weixin.qq.com/miniprogram/dev/framework {errMsg: "cloud.callFunction:ok", result: {…}, requestID: "271c172f-64c8-48f2-9be7-2ecd8d83148a"}errMsg: "cloud.callFunction:ok"requestID: "271c172f-64c8-48f2-9be7-2ecd8d83148a"result: {code: "DATABASE_TRANSACTION_FAIL", message: "[ResourceUnavailable.TransactionNotExist] Transact…request, but if the problem persists, contact us.", requestId: "1647234744878_0.30454557461508514_33572427-17f86d787aa_9e"}__proto__: Object代码 exports.enrollCourse = async (event) => {     try {         await db.runTransaction(async transaction => {             let resQuery = {}             resQuery[reservations.SCHEMA.userId] = event.userId             resQuery[reservations.SCHEMA.slotId] = event.slotId             let res = await transaction.collection(reservations.TABLE_NAME).where(resQuery).get()             if (res.data.length != 0) {                 await transaction.rollback({                     code: 412,                     message: "You've already enrolled"                 })                 return             }             let userQuery = {}             userQuery[users.SCHEMA.openId] = event.userId             let userEntry = await transaction.collection(users.TABLE_NAME).where(userQuery).get()             if (userEntry.data.length == 0) {                 await transaction.rollback({                     code: 403,                     detail: {                         table: users.TABLE_NAME                     }                 })                 return             }             let user = userEntry.data[0]             let futures = []             futures.push(transaction.collection(slots.TABLE_NAME).doc(event.slotId).get())             futures.push(transaction.collection(courses.TABLE_NAME).doc(event.courseId).get())             let result = await Promise.all(futures)             let slot = result[0]             let course = result[1]             if (!course.data) {                 await transaction.rollback({                     code: 403,                     detail: {                         table: courses.TABLE_NAME                     }                 })                 return             }             if (!slot.data) {                 await transaction.rollback({                     code: 403,                     detail: {                         table: slots.TABLE_NAME                     }                 })                 return             }             if (slot.data[slots.SCHEMA.enrolledNumber] >= course.data[courses.SCHEMA.capacity]) {                 await transaction.rollback({                     code: 412,                     message: "Full capacity"                 })                 return             }             if (slot.data[slots.SCHEMA.limitCourseId] != undefined && slot.data[slots.SCHEMA.limitCourseId] != course.data[courses.SCHEMA.id]) {                 await transaction.rollback({                     code: 412,                     message: "Course id doesn't match"                 })                 return             }             console.log(user[users.SCHEMA.balance], course.data[courses.SCHEMA.price])             if (user[users.SCHEMA.balance] < course.data[courses.SCHEMA.price]) {                 await transaction.rollback({                     code: 412,                     message: "Insufficient Balance"                 })                 return             }             let writes = []             userUpdate = {}             userUpdate[users.SCHEMA.balance] = _.inc(-course.data[courses.SCHEMA.price])             writes.push(transaction.collection(users.TABLE_NAME).where(userQuery).update({                 data: userUpdate             }))             slotUpdate = {}             slotUpdate[slots.SCHEMA.enrolledNumber] = _.inc(1)             slotUpdate[slots.SCHEMA.limitCourseId] = course.data[courses.SCHEMA.id]             writes.push(transaction.collection(slots.TABLE_NAME).doc(event.slotId).update({                 data: slotUpdate             }))             data = {}             data[reservations.SCHEMA.userId] = event.userId             data[reservations.SCHEMA.slotId] = event.slotId             data[reservations.SCHEMA.startTs] = slot.data[slots.SCHEMA.startTs]             data[reservations.SCHEMA.courseId] = event.courseId             data[reservations.SCHEMA.courseName] = course.data[courses.SCHEMA.name]             data[reservations.SCHEMA.price] = course.data[courses.SCHEMA.price]             data[reservations.SCHEMA.anonymous] = !event.isPublic             writes.push(transaction.collection(reservations.TABLE_NAME).add({                 data: data             }))             try {                 await Promise.all(writes)             } catch (e) {                 console.error(e)                 await transaction.rollback({                     code: 500,                     message: e.errMsg,                 })             }         })     } catch (e) {         if (e.code) {             return e         } else {             console.error("hehe", e)             return {                 code: 500,                 message: e.errMsg,             }         }     }     return {         code: 200,     } }