我正在编写一个远程方法,通过运行聚合管道查询可以大大增强它。
要做到这一点,我需要获得实际的mongodb连接并直接使用它。
我如何按照
的方式运行module.exports = function(ZipCodes) {
ZipCodes.pipeline = function (cb) {
//Get the MongoDB Connection
var mongodbConnection = ***whatever magic***
var result = mongodbConnection.db.zipcodes.aggregate( { $group :
{ _id : "$state",
totalPop : { $sum : "$pop" } } },
{ $match : {totalPop : { $gte : 10*1000*1000 } } } );
cb(result);
};
ZipCodes.remoteMethod('pipeline', {
returns: {arg: 'zips', type: 'array', root: false},
http: {path:'/pipeline', verb: 'get'}
});
};
我在我的datasources.json中定义了mongo为
{
"db": {
"name": "db",
"connector": "memory"
},
"MongoDB": {
"host": "localhost",
"port": 27017,
"name": "MongoDB",
"connector": "mongodb"
}
}
答案 0 :(得分:8)
好的,做了一点挖掘,主要是关于loopback和mongodb连接器源代码。如果你想直接访问mongoDB连接,你可以,但要小心!
module.exports = function(ZipCodes) {
ZipCodes.pipeline = function (cb) {
//Get the MongoDB Connection
var mongodbConnection = ZipCodes.dataSource.connector.db;
if (!mongodbConnection) {
// may not be connected yet, you might have to do that manually:
// (careful! this is asynchronous)
ZipCodes.dataSource.connect(function(err, db) {
mongodbConnection = db;
});
}
// do whatever you need to with the mongo connection...
cb(result);
};
// ... other stuff
};