How to access a specific field in Expressjs returned by mongodb collection.find method?

Question

I'm Trying to access one field returned from mongodb collection.find method , I can't do that and nothing is showing on the console.log

router.get('/buildings', function(req, res, next) {
var db = req.db;
var collection = db.get('buildings');

collection.find({buildingNO:"1"},{},function(e,docs){
     var x=docs[0].price;
     console.log(x);
    });
});

Note: I'm using monk middle-ware not native mongodb

thanks

Answer 1

Check the error argument in the callback and your return argument is:

x=docs[0]...

And not:

x=doc[0]

I'm surprised you don't get an undefined variable error.

Answer 2

You can use The feature projection in nodejs .

The projection is the second object you pass empty {} so will project all attributes.

For example :

If you project an object like:

{
_id:false// or 0
}

Will omit the _id attribute.

Here we will pass price :

collection.find({buildingNO:"1"},{price:1},function(e,docs){
     var x=docs[0].price;
     console.log(x);
    });

You have a typo on doc[0] should be docs

http://docs.mongodb.org/manual/reference/method/db.collection.find/