与mongoose / node.js共享数据库连接参数的最佳方式 [英] Best way to share database connection param with mongoose/node.js

问题描述

我正在使用 Mongoose 来管理Mongo数据库。我的连接文件很简单：

I'm using Mongoose to manage a Mongo database. My connection file is quite simple:

var mongoose = require('mongoose')

mongoose.connection.on("open", function(){
  console.log("Connection opened to mongodb at %s", config.db.uri)
});
console.log("Connecting to %s", config.db.uri)
mongoose.connect(config.db.uri)

global.mongoose = mongoose

然后在我的app.js中我只是

Then in my app.js I just

require('./database)

和mongoose变量在全球可用。我不想使用全局变量（至少不直接）。有没有更好的方式通过单例模式或其他方法跨节点（我使用express.js）共享数据库连接变量？

and the "mongoose" variable is available globally. I'd prefer not to use globals (at least not directly). Is there a better way of sharing the database connection variable across node (I'm using express.js) via a singleton pattern or some other method?

推荐答案

我只在app.js文件中执行以下操作：

I just do the following in my app.js file:

var mongoose = require('mongoose');
mongoose.connect('mongodb://address_to_host:port/db_name');
modelSchema = require('./models/yourmodelname').YourModelName;
mongoose.model('YourModelName', modelSchema);
// TODO: write the mongoose.model(...) command for any other models you have.

此时，需要访问该模型的任何文件都可以执行以下操作：

At this point any file that needs access to that model can do:

var mongoose = require('mongoose');
YourModelName = mongoose.model('YourModelName');

最后在您的模型中，您可以正确写入文件，然后将其导出到底部： / p>

And finally in your model, you can have the file written normally then export it at the bottom:

module.exports.YourModelName = YourModelName;

我不知道这是最好的最棒的解决方案（刚刚开始围绕导出模块约2天前），但它工作。也许有人可以评论，如果这是一个很好的方法。

I don't know if this the best most awesome solution (just started wrapping my head around exporting modules about 2 days ago) but it does work. Maybe someone can comment if this is a good way to do it.

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