node.js - Mongoose 和模型连接

Question

我正在努力了解 mongoose 如何使用它的连接。目前我有:

// Datastore.js
var mongoose = require('mongoose'),
    conn = mongoose.createConnection();

...

conn.open(host, database, port, options, callback); // Opens connection


// Model.js
var mongoose = require('mongoose');
var Schema = new mongoose.Schema({...})
module.exports = exports = mongoose.model('MyModel', Schema);


// Controller.js
var mongoose = require('mongoose');
var MyModel = mongoose.model('MyModel'); // Retrieves the model ok

MyModel.find({}, function(err, docs){
   if(err){} //
   console.log(docs); // Does not work
});

但是这不起作用......它只有在我以某种方式传递连接时才有效:

// Datastore.js
var mongoose = require('mongoose'),
    conn = mongoose.createConnection();

...

conn.open(host, database, port, options, callback); //

mongoose.set('db', conn);


// Controller.js
var mongoose = require('mongoose'),
    db = mongoose.get('db');

var MyModel = db.model('MyModel'); // Retrieve the model using the connection instance

MyModel.find({}, function(err, docs){
   if(err){} //
   console.log(docs); // Works
});

我认为我正在以错误的方式处理这个问题......第一种方法应该有效吗？我做错了什么？

Answer 1

最简单的方法是打开所有 mongoose 调用共享的默认连接池:

// Datastore.js
var mongoose = require('mongoose'),
    db = mongoose.connect('localhost', 'dbname');

然后在所有其他文件中使用 mongoose.model(...) 访问池。