node.js - 引用 Mongoose 模式的类型错误

Question

我正在使用 mongoose ODM 使用 mongodb 开发 Node 应用程序。我在类型引用驻留在不同文件中的模式时遇到错误。

我在 user.js 文件中有以下代码:

var mongoose = require('mongoose');
var Trip = require('./trip');

var userSchema = mongoose.Schema({
    firstName: String,
    lastName: String,
    salt: String,
    hash: String,
    emailAddress: {
        type: String,
        unique: true
    },
    trips: [{Type: mongoose.Schema.Types.ObjectId, ref: 'Trip'}]
});

module.exports = mongoose.model('User', userSchema);

userSchema 具有对 tripSchema 的类型引用。

trip.js 文件中的代码是:

    var tripSchema = mongoose.Schema({
      name: String,
      location: String,
      arrivalDate: Date,
      departureDate: Date,
      type: String});

   module.exports = mongoose.model('Trip', tripSchema);

当我运行应用程序时，我收到以下错误:

    /usr/lib/node_modules/mongoose/lib/schema.js:360
    throw new TypeError('Undefined type at `' + path +
          ^
TypeError: Undefined type at `trip.ref`
  Did you try nesting Schemas? You can only nest using refs or arrays.
    at Function.Schema.interpretAsType       (/usr/lib/node_modules/mongoose/lib/schema.js:360:11)
    at Schema.path (/usr/lib/node_modules/mongoose/lib/schema.js:303:29)
    at Schema.add (/usr/lib/node_modules/mongoose/lib/schema.js:217:12)
    at Schema.add (/usr/lib/node_modules/mongoose/lib/schema.js:212:14)
    at new Schema (/usr/lib/node_modules/mongoose/lib/schema.js:73:10)
    at Function.Schema.interpretAsType (/usr/lib/node_modules/mongoose/lib/schema.js:345:44)
    at Schema.path (/usr/lib/node_modules/mongoose/lib/schema.js:303:29)
    at Schema.add (/usr/lib/node_modules/mongoose/lib/schema.js:217:12)
    at new Schema (/usr/lib/node_modules/mongoose/lib/schema.js:73:10)
    at Mongoose.Schema (/usr/lib/node_modules/mongoose/lib/schema.js:53:12)

我无法找出错误的原因。如果两个模式都在同一个文件中，则代码运行良好。但是当我在两个不同的文件中分离出模式时，我遇到了错误。如何解决此错误？任何帮助将不胜感激。

Answer 1

您的 userSchema 中有错字。你放了

trips: [{Type: mongoose.Schema.Types.ObjectId, ref: 'Trip'}]

但应该是的

trips: [{type: mongoose.Schema.Types.ObjectId, ref: 'Trip'}]

Type 应为小写 type