Mongo：通过ObjectId查找未在流星中定义？

Question

I am using existing Mongodb in meteor project. The existing mongo id represented by ObjectId() . When I try to find by _id , Meteor says ObjectId is not defined

JS :

Names = new Mongo.Collection('name_list', {idGeneration: 'MONGO'});
Names.find({"_id" : ObjectId("5539d9dcf046be5b2302aefc")}) //ReferenceError: ObjectId is not defined

The above JavaScript code is run in server.

Answer 1

You have to use new Mongo.ObjectID("5539d9dcf046be5b2302aefc") . See the meteor docs for some caveats.

If you want to save having to type new and Mongo. each time, you can define a function:

function ObjectId(hexString) { return new Mongo.ObjectID(hexString); };

and then the code you wrote will work.

Answer 2

You just need to require the ObjectId function from your mongo.

ObjectId = require('mongodb').ObjectID;

Then you can use it like that:

ObjectId("5539d9dcf046be5b2302aefc")

Answer 3

If you are using mongojs:

db.mycollection.findOne({
    _id: mongojs.ObjectId('your object id')
}, function(err, doc) {
    //do your stuff here.
})