mongodb - Model.findOne 没有按预期工作？

Question

[
  {
    "userId": "5bb6730721f28a295436b36e",
    "reputationNumber": 0,
    "questions": [],
    "answers": [],
    "id": "5bb6730721f28a295436b36f"
  },
  {
    "userId": "5bb6738c21f28a295436b370",
    "reputationNumber": 0,
    "questions": [],
    "answers": [],
    "id": "5bb6738c21f28a295436b371"
  }
]

我在模型 userDatas 中有 2 个元素，我想通过使用 userId 属性进行过滤来查找单个 userData。

这是我做的

Userdatas.findByUserId = function(req, res, cb) {
    const queryId = req.query.userId
    console.log("queryId: ",queryId);
    Userdatas.find({ userId: "5bb6738c21f28a295436b370"}, function(err, obj){
        console.log(obj);
        var userData = obj;
        cb(null, userData);
    });
}

令人惊讶的是，控制台输出是，

    [ { userId: '5bb6730721f28a295436b36e',
    reputationNumber: 0,
    questions: List [],
    answers: List [],
    id: 5bb6730721f28a295436b36f },
  { userId: '5bb6738c21f28a295436b370',
    reputationNumber: 0,
    questions: List [],
    answers: List [],
    id: 5bb6738c21f28a295436b371 } ]

我期望的是，

{
    "userId": "5bb6738c21f28a295436b370",
    "reputationNumber": 0,
    "questions": [],
    "answers": [],
    "id": "5bb6738c21f28a295436b371"
  }

但查询在 robo mongo shell 中运行完美。

Answer 1

在环回“find”和“findOne”函数中接受这种模式的查询:{where:{queryFilters}}

因此，在您的示例中，您可以这样更改它:

Userdatas.findByUserId = function(req, res, cb) {
    const queryId = req.query.userId
    console.log("queryId: ",queryId);
    Userdatas.findOne({ where:{userId: "5bb6738c21f28a295436b370"}}, function(err, obj){
        console.log(obj);
        var userData = obj;
        cb(null, userData);
    });
}

在选项下打开 user-datas.json 添加 "strictObjectIDCoercion": true 属性。