Mongoose ODM 模型创建问题

Question

我正在尝试使用 express 应用在 mongoose 中创建模型。 我得到的错误如下：

Did you try nesting Schemas? You can only nest using refs or arrays.

我的设置如下：

1. 我有一个模块名称 Schemas，我使用 npm link 链接到我的 Express 应用程序

2. Schemas 模块有一个入口点 index.js，它具有以下内容

   module.exports = require('./lib/index');
   

3. 上述所需的索引文件（./lib/index.js）有：

   module.exports = {    InstituteSchema: require('./Schemas/Institute') }
   

4. 上述研究所文件（./Schemas/Institute）有以下内容：

   var mongoose = require('mongoose');
   var Schema = mongoose.Schema;
   
   var RegistrySchema = new Schema({
   name: String,
   privileges: [String]
   });
   
   module.exports = RegistrySchema;
   

5. 以下是我的快递应用的摘录：

   var express = require('express');
   var mongoose = require('mongoose');
   mongoose.connect('mongodb://localhost/Project');
   var http = require('http');
   var path = require('path');
   var routes = require('./routes');
   var RegistrySchema = require('Schemas').RegistrySchema;
   var RegistryModel = mongoose.model('Registry', RegistrySchema);
   

但是，当我运行 Express 时，我得到以下堆栈跟踪：

   /usr/local/bin/node app.js

   /Users/user/Documents/WebstormProjects/Project/node_modules/mongoose/lib/schema.js:362 throw new TypeError('Undefined type at `' + path +

   TypeError: Undefined type at `paths.name`
   Did you try nesting Schemas? You can only nest using refs or arrays.
at Function.Schema.interpretAsType (/Users/user/Documents/WebstormProjects/Project/node_modules/mongoose/lib/schema.js:362:11)
at Schema.path (/Users/user/Documents/WebstormProjects/Project/node_modules/mongoose/lib/schema.js:305:29)
at Schema.add (/Users/user/Documents/WebstormProjects/Project/node_modules/mongoose/lib/schema.js:217:12)
at Schema.add (/Users/user/Documents/WebstormProjects/Project/node_modules/mongoose/lib/schema.js:212:14)
at new Schema (/Users/user/Documents/WebstormProjects/Project/node_modules/mongoose/lib/schema.js:73:10)
at Mongoose.model (/Users/user/Documents/WebstormProjects/Project/node_modules/mongoose/lib/index.js:293:14)
at Object.<anonymous> (/Users/user/Documents/WebstormProjects/Project/app.js:12:30)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)

Process finished with exit code 8

Answer 1

我建议您有一个模型目录，在该目录中为每个模型定义一个文件。在模型文件中导出模型本身。

在模型/Registry.js -

module.exports = mongoose.model('Registry', RegistrySchema);

在你的 app.js 中，只需要所有模型文件 -

var fs = require('fs'),
    modelPath = __dirname + '/models';

fs.readdirSync(modelPath).forEach(function(file) {
    require(modelPath + '/' + file);
});

看看 MEAN 堆栈锅炉结构 - https://github.com/linnovate/mean/tree/master/app

还可以查看这篇文章以了解 require 的工作原理 - http://openmymind.net/2012/2/3/Node-Require-and-Exports/