事务内的mongoose findone():未捕获类型错误:无法读取未定义的属性“$elemmatch”

我已经花了很多时间了,找不到解决办法。

我正在使用node/express并尝试运行mongoose (^5.2.0) 芬达尼 与交易。对于数据库,我在内存中运行它, 运行rs .

该集合以前是用有效文档填充的,我可以使用 蒙戈壳 :

rs:PRIMARY> db.lots.findOne("aaaabbbbccccdddd11112222")
{
    "_id" : ObjectId("aaaabbbbccccdddd11112222"),
    "availableQty" : 0,
    "expirationDate" : ISODate("2019-01-10T15:10:29.455Z"),
    "__v" : 0
}

但是每当我运行下面的代码时,我都会收到一个错误:

const save = async (lotId) => {
    const session = await mongoose.startSession()
    await session.startTransaction()
    try {        
        let lot = await Lots.findOne(lotId, session)
        console.log('result: ' + lot)

        await session.commitTransaction()
        await session.endSession()
        return lot    
    } catch(err) {
        console.error('caught error: ' + err)
        await session.abortTransaction()
        await session.endSession()
        throw err
    }
}

错误:

Uncaught TypeError: Cannot read property '$elemMatch' of undefined
      at model.Query._castFields (node_modules/mongoose/lib/query.js:3873:22)
      at model.Query.Query._findOne (node_modules/mongoose/lib/query.js:1861:23)
      at process.nextTick (node_modules/kareem/index.js:333:33)
      at _combinedTickCallback (internal/process/next_tick.js:95:7)
      at process._tickCallback (internal/process/next_tick.js:161:9)

而且似乎在catch()中甚至没有捕捉到它,因为我的console.log从未被打印过。