Mongoose TypeError: Cannot read property 'insertOne' of null

Question

我整个早上都在想我搞砸了什么。

首先是问题：当我调用 myModel.create() 时，我在控制台中得到了这个：

TypeError: Cannot read property 'insertOne' of null

架构和模型：

const callSchema = new mongoose.Schema({
        date: Date,
        times: {
            dispatch: String,
            clear: String
        },
        incident: Number,
        calltype: String,
        address: {
            streetAddress: String,
            city: String,
            state: String,
            zip: String
        },
        recall: [ 
            {type: mongoose.Schema.Types.ObjectId,
            ref: "User"}],
    });
const callData = mongoose.model("callData", callSchema);

现在是数据和函数：

//dummy data:

var call = {
        date: '2020-02-19T08:35:04.803Z', 
        times: {
            dispatch: '1800', 
            clear: '1900'},
        incident: 2000599,
        calltype: 'medical', 
        address: { 
            streetAddress: '1200 Southgate', 
            city: 'Pendleton',
            state: 'OR',
            zip: '97801'},
        recall: ["5e4b5ac03e6a9e3ed521ab80"]
        };

function newCall(runData, times, personell){
    console.log(runData);

    callData.create(runData);
}

newCall(call);

我做了什么：

我注释掉了架构和数据中除日期之外的所有内容，以尝试缩小问题范围。这并没有改变它继续抛出相同错误的任何行为。我环顾四周，其他人也有类似的问题，但我更正了他们建议的内容（将 type: 更改为 calltype:），但我找不到我在模式中搞砸的地方。

如有任何帮助，我们将不胜感激。

-亚当

Answer 1

问题出在我的数据库连接上。我没有将其设置为正确等待。所以这是一个异步问题，现在通过正确设置我的连接函数等待和 return 一旦完成来解决。

举个例子：

const mongoose = require('mongoose'),
      logger   = require('../logging');



async function connect(){

//I had to place mongoose.connect(...)... in side of the const connected.
  const connected =  mongoose.connect("mongodb://localhost:27017/fdData", { 
    useNewUrlParser: true,
    useUnifiedTopology: true,
    bufferCommands: false,
    useFindAndModify: false,
});

  let con = mongoose.connection;
  con.on('error', logger.error.bind(logger, 'connection error:'));
  con.once('open', function() {
    logger.info('DB Connected');
  });

  mongoose.connection.on('disconnected', function(){
    console.log("Mongoose default connection is disconnected");
});

process.on('SIGINT', function(){
  mongoose.connection.close(function(){
      console.log("Mongoose default connection is disconnected due to application termination");
      process.exit(0)
  });
});

//I had to ADD this return as I did not have it.
return connected;

}

async function disconnect(){
    await mongoose.disconnect()
}

module.exports= {connect, disconnect}

通过执行这些操作，它会强制我的代码等待执行其余部分，直到数据库正式连接。

-亚当

Mongoose TypeError: Cannot read property 'insertOne' of null

Mongoose TypeError: Cannot read property 'insertOne' of null

mongoose

mongodb

mongoose-schema