[英]Exporting a mongoose database module
I need to export my mongoose database module, so I could use my defined models from every module in my program. 我需要导出我的猫鼬数据库模块,以便可以使用程序中每个模块的定义模型。
For example, my database.js module looks something like that: 例如,我的database.js模块看起来像这样:
var mongoose = require('mongoose'),
db = mongoose.createConnection('mongodb://localhost/newdb'),
Schema = mongoose.Schema;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function callback () {
console.log("Connected to database newdb");
var dynamicUserItemSchema = new mongoose.Schema({
userID: Number,
rank: Number,
});
var staticUserItemSchema = new mongoose.Schema({
_id: Schema.Types.Mixed,
type: Schema.Types.Mixed,
});
var DynamicUserItem = db.model('DynamicUserItem', dynamicUserItemSchema);
var StaticUserItem = db.model('StaticUserItem', staticUserItemSchema);
});
I want to be able adding var db = require('../my_modules/database');
我希望能够添加
var db = require('../my_modules/database');
to any other module my program - so I will be able to use the models like that: 到程序的任何其他模块-这样我就可以使用类似的模型:
db.DynamicUserItem.find();
or item = new db.DynamicUserItem({});
或
item = new db.DynamicUserItem({});
Is it possible doing that using "exports" or "module exports" ? 是否可以使用“导出”或“模块导出”来做到这一点? Thanks.
谢谢。
I usually don't use the error
and open
events and follow the example from mongoosejs to create a connection to my db. 我通常不使用
error
和open
事件,而是按照mongoosejs的示例创建与我的数据库的连接。 Using the example you could do the following. 使用该示例,您可以执行以下操作。
db.js db.js
var mongoose = require('mongoose');
var db = mongoose.createConnection('localhost', 'test');
var schema = mongoose.Schema({ name: 'string' });
var Cat = db.model('Cat', schema);
module.exports = Cat; // this is what you want
and then in your app.js you can do something like 然后在您的app.js中,您可以执行以下操作
var Cat = require('db');
var peter = new Cat();
Hope that helps! 希望有帮助!
You can use exports to define a module that can be required elsewhere: 您可以使用导出来定义其他地方可能需要的模块:
./models/list.js ./models/list.js
var ListSchema = new Schema({
name : { type: String, required: true, trim: true }
, description : { type: String, trim: true }
});
module.exports = db.model('List', ListSchema);
./routes/list.js ./routes/list.js
var list = module.exports = {};
var List = require('../models/list');
list.get = function(req, res){
List.find({ user: user._id }).exec(function(err, lists){
res.render('lists', {
lists: lists,
});
});
});
};
./app.js ./app.js
app.get('lists', routes.lists.get);
If you are using express, then I would put the models in the app.settings. 如果您使用的是Express,那么我会将模型放入app.settings中。 You can do something like this at config time:
您可以在配置时执行以下操作:
app.configure(function() {
app.set('db', {
'main' : db
, 'users' : db.model('User')
})
})
You would then be able to use the models like req.app.settings.db.users
, or you can create a way to get the db
var in the file you want in other ways. 然后,您将能够使用诸如
req.app.settings.db.users
之类的模型,或者您可以通过其他方式创建一种在所需文件中获取db
var的方法。
This answer is not a complete example, but take a look at my starter project that sets up express and mongoose in a relative easy to use way: https://github.com/mathrawka/node-express-starter 这个答案不是一个完整的例子,但请看一下我的入门项目,该项目以相对易于使用的方式设置了express和mongoose: https : //github.com/mathrawka/node-express-starter
As an adding to accepted answer, if you want to export multiple modules you can do: 作为已接受答案的补充,如果要导出多个模块,可以执行以下操作:
In db.js: 在db.js中:
var my_schemas = {'Cat' : Cat, 'Dog': Dog};
module.exports = my_schemas;
Then in the app.js: 然后在app.js中:
var schemas = require('db');
var Cat = schemas.Cat;
var Dog = schemas.Dog;
Cat.find({}).exec({...});
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