使用 mongoose.model() 时出现错误类型错误：无法读取未定义的属性'test'

Question

我的schema

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var test = new Schema({
    name : {
       type : String,
       require : true,
       sparse : true
    },
    description : {
       type : String
    },
    questions : {
       type : [Schema.Types.ObjectId],
       sparse : true
    }  }); 
    module.exports = new mongoose.model('test', test);

当我尝试执行时，它给我错误如下:

TypeError: Cannot read property 'test' of undefined
at new Mongoose.model (/home/utkarsh/Desktop/MEAN_REST_user_management/node_modules/mongoose/lib/index.js:329:25)
at Object.<anonymous> (/home/utkarsh/Desktop/MEAN_REST_user_management/app/models/test.js:19:18)
at Module._compile (module.js:541:32)
at Object.Module._extensions..js (module.js:550:10)
at Module.load (module.js:458:32)
at tryModuleLoad (module.js:417:12)
at Function.Module._load (module.js:409:3)
at Module.require (module.js:468:17)
at require (internal/module.js:20:19)
at Object.<anonymous> (/home/utkarsh/Desktop/MEAN_REST_user_management/app/routes/test.js:6:13)
at Module._compile (module.js:541:32)
at Object.Module._extensions..js (module.js:550:10)
at Module.load (module.js:458:32)
at tryModuleLoad (module.js:417:12)
at Function.Module._load (module.js:409:3)
at Module.require (module.js:468:17)

我以前使用过相同的格式，它工作得很好。不知道为什么不行。有人能帮忙吗?

Answer 1

修改如下:

module.exports = new mongoose.model('test', test);

:

module.exports = mongoose.model('test', test);

mongoose.model()不是一个类，所以你不应该实例化它(使用new)。