Grommet: TypeError:无法读取未定义的属性“”modelSchemas“”

Question

我使用的是grommet 1.3.4版本，并尝试将mongodb与node js和express一起使用。当我运行npm install时，我得到以下TypeError：

/home/jorge/Desktop/crud-app/node_modules/mongoose/lib/index.js:373
  if (!this.modelSchemas[name]) {
            ^

TypeError: Cannot read property 'modelSchemas' of undefined
    at Mongoose.model (/home/jorge/Desktop/crud-app/node_modules/mongoose/lib/index.js:373:13)
    at Object.<anonymous> (/home/jorge/Desktop/crud-app/dist-server/models/person.model.js:18:39)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Module.require (internal/modules/cjs/loader.js:650:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/home/jorge/Desktop/crud-app/dist-server/controllers/person.controller.js:9:15)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Module.require (internal/modules/cjs/loader.js:650:17)
[nodemon] app crashed - waiting for file changes before starting...

这是我在Person模式中使用的代码：

import { Schema, model } from 'mongoose';

const PersonSchema = new Schema({
    name: String,
    lastName: String,
    age: Number,
    gender: String,
    updatedAt: { type: Date, default: Date.now },
    status: Boolean,
});

export default model('Person', PersonSchema);

巴别塔把它转换成这样：

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _mongoose = require('mongoose');

var PersonSchema = new _mongoose.Schema({
    name: String,
    lastName: String,
    age: Number,
    gender: String,
    updatedAt: { type: Date, default: Date.now },
    status: Boolean
});

exports.default = (0, _mongoose.model)('Person', PersonSchema);
//# sourceMappingURL=person.model.js.map

显然，它在我导出模型的最后一行失败了。我对mongodb和grommet都不是很熟悉，所以你知道我做错了什么吗？

Answer 1

显然import { Schema, model } from 'mongoose';不工作..。我不得不使用下面的代码：

import mongoose from 'mongoose';

const PersonSchema = new mongoose.Schema({
    name: String,
    lastName: String,
    age: Number,
    gender: String,
    updatedAt: { type: Date, default: Date.now },
    status: Boolean,
});

export default mongoose.model('Person', PersonSchema);