猫鼬和模型连接

Question

我试图了解猫鼬如何使用它的连接.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
});

我想我是以错误的方式接近这个......如果第一种方法有效,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访问池mongoose.model(...).