【mongoose】save方法報(bào)錯(cuò)

數(shù)據(jù)如下：

{
    array: [
        {
            _id: 'aaa'
            sub_array: [
                {
                    _id: 'saaa',
                    name: 'aaa'
                },
                {...}
            ]
        },
        {...}
    ]
}

現(xiàn)在我要更新sub_array的name值：

Model.findOne({
    'array._id': 'aaa'
},{'array.$': 1}).then(respon=> {
    let checkdt = respon.array[0].sub_array.find((item)=> {
        reruen item._id == 'saaa'
    })
    checkdt.name = 'new val'
    respon.save().then(r=> res.send(r)).catch(er=> res.send(er))
})

結(jié)果報(bào)錯(cuò)：

{
    "message": "For your own good, using `document.save()` to update an array which was selected using an $elemMatch projection OR populated using skip, limit, query conditions, or exclusion of the _id field when the operation results in a $pop or $set of the entire array is not supported. The following path(s) would have been modified unsafely:\n  questions.0.sub_questions.1.score\n  questions.0.sub_questions.1.title\nUse Model.update() to update these arrays instead.",
    "name": "DivergentArrayError"
}

為什么會(huì)這樣？我該怎么修改？