Mongoose Schema 尚未注册模型 [英] Mongoose Schema hasn't been registered for model

问题描述

我正在学习平均堆栈，当我尝试使用

I'm learning the mean stack and when I try to start the server using

npm start

我收到一条异常消息:

schema hasn't been registered for model 'Post'. Use mongoose.model(name, schema)

这是我在/models/Posts.js 中的代码

here is my code inside /models/Posts.js

var mongoose = require('mongoose');

var PostSchema = new mongoose.Schema({
    title: String,
    link: String, 
    upvotes: { type: Number, default: 0 },
    comments: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Comment' }]
});

mongoose.model('Post', PostSchema);

正如我所看到的，应该为模型Post"注册架构，但是什么可能导致抛出异常?

as I can see the schema should be registered for the model 'Post', but what can be possibly causing the exception to be thrown?

提前致谢.

这是异常错误

/home/arash/Documents/projects/personal/flapper-news/node_modules/mongoose/lib/index.js:323
  throw new mongoose.Error.MissingSchemaError(name);
        ^
MissingSchemaError: Schema hasn't been registered for model "Post".
Use mongoose.model(name, schema)

这里是带有 mongoose 初始化的 app.js 代码:

and here's the app.js code with the mongoose initialization:

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/news');
require('./models/Posts');
require('./models/Comments');

行前:

app.use('/', routes);

推荐答案

这不是模型导出的问题.我遇到过同样的问题.

It's not an issue with model export. I had the same issue.

真正的问题是模型的 require 语句

The real issue is that require statements for the models

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/news');
require('./models/Posts');
require('./models/Comments');

位于路由依赖项之下.只需将 mongoDB 依赖项移动到路由依赖项之上.它应该是这样的:

were below the routes dependencies. Simply move the mongoDB dependencies above the routes dependencies. This is what it should look like:

// MongoDB
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/news');
require('./models/Posts');
require('./models/Comments');

var routes = require('./routes/index');
var users = require('./routes/users');

var app = express();

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