我正在学习平均堆栈，当我尝试使用

npm start

我得到一个异常(exception)说:

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

这是我在/models/Posts.js 中的代码

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);

正如我所见，架构应该为模型“Post”注册，但是什么可能导致抛出异常？

提前致谢。

编辑: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)

这是带有 mongoose 初始化的 app.js 代码:

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

行前:

app.use('/', routes);

最佳答案

这不是模型导出的问题。我遇到过同样的问题。

真正的问题是模型的 require 语句

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

低于路由依赖项。只需将 mongoDB 依赖项移到路由依赖项之上。它应该是这样的:

// 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();

https://stackoverflow.com/questions/26818071/