执行查找查询时从 mongodb 获取空数组

Question

提前致谢，为什么即使使用正确的架构名称，我也会从 Mongodb 获取一个空数组？

const Mongoose = require("mongoose");   
const studentSchema = Mongoose.Schema({
  _id: { type: Number, required: true },
  name: { type: String, required: true, max: 30 },
  department: { type: String, required: true,max: 30 },
  type: { type: String, required: true, min: 7, max: 30 }
});
module.exports = Mongoose.model("StudentInformation", studentSchema);
-----------------------------------------------------------------------
class  Service {
  static get() {
    const data = studentsModel.find({}).then((result) => {
        console.log(studentsModel)
      return result;
    });
    return data;
  }
}
----------------------------------------------------------------------

```
> db.getCollectionNames();
[ "StudentInformation", "students" ]
> db.StudentInformation.find();
{ "_id" : 1, "name" : "selva", "department" : "CSE", "type" : "regular" }
{ "_id" : 2, "name" : "ashik", "department" : "CSE", "type" : "regular" }
{ "_id" : 3, "name" : "praveen", "department" : "CSE", "type" : "parttime" }

Answer 1

您的 get() 函数中有错误的“返回”指令：

 static get() {
    const data = studentsModel.find({}).then((result) => {
        console.log(studentsModel)
      return result;
    });
    **return data;**
  }

这部分是异步的

studentsModel.find({}).then((result) => {

在执行 find 回调之前返回的数据为空/未定义