Trying to combine 2 vars but getting: mergedObject is not defined

Question

I'm trying to combine the 2 objects and save them to the collection. But as I'm really new to Node.js/Express I think I'm missing something. All advice is welcome!

Thx in advance for your precious time.

This is what I puzzled together but doesn't work:

app.post('/:collection', function(req, res) {
    var object = req.body;
    var collection = req.params.collection;
    geocoder.geocode(req.body.address.street + req.body.address.no + req.body.address.zip + req.body.address.city, function(req, res) {
    var gpslocation = ({"loc": [res[0].longitude, res[0].latitude]});
    mergedObject = JSON.parse((JSON.stringify(object) + JSON.stringify(gpslocation)).replace(/}{/g,","))
    console.log(mergedObject);
    });
    collectionDriver.save(collection, object, function(error,docs) {
          if (error) { res.send(400, error); }
          else { res.send(201, docs);} //B
   });
});

output(console.log) but actual save is working but not with the longitude/latitude appended to it:

{ cat: 'Electrician6',
name: { first: 'John', last: 'Pipe', picture_ID: '23872' },
created_at: '2015-05-16T14:05:23.431Z',
_id: '55574ea3435c2d9c24d21572',
loc: [ 4.7261822, 50.9635574 ] }

But when I edit it to:

app.post('/:collection', function(req, res) { //A
    var object = req.body;
    var collection = req.params.collection;
    geocoder.geocode(req.body.address.street + req.body.address.no + req.body.address.zip + req.body.address.city, function(req, res) {
    var gpslocation = ({"loc": [res[0].longitude, res[0].latitude]});
    mergedObject = JSON.parse((JSON.stringify(object) + JSON.stringify(gpslocation)).replace(/}{/g,","))
    console.log(mergedObject);
    });
    collectionDriver.save(collection, mergedObject, function(error,docs) {
          if (error) { res.send(400, error); }
          else { res.send(201, docs);} //B
   });
});

output:

ReferenceError: mergedObject is not defined
    at app.put.params (/app/testapp/index.js:92:39)
    at callbacks (/app/testapp/node_modules/express/lib/router/index.js:161:37)
    at param (/app/testapp/node_modules/express/lib/router/index.js:135:11)
    at param (/app/testapp/node_modules/express/lib/router/index.js:132:11)
    at pass (/app/testapp/node_modules/express/lib/router/index.js:142:5)
    at Router._dispatch (/app/testapp/node_modules/express/lib/router/index.js:170:5)
    at Object.router (/app/testapp/node_modules/express/lib/router/index.js:33:10)
    at next (/app/testapp/node_modules/express/node_modules/connect/lib/proto.js:190:15)
    at Object.staticMiddleware [as handle] (/app/testapp/node_modules/express/node_modules/connect/lib/middleware/static.js:55:61)
    at next (/app/testapp/node_modules/express/node_modules/connect/lib/proto.js:190:15)
    { cat: 'Electrician6',
    name: { first: 'John', last: 'Pipe', picture_ID: '23872' },
    loc: [ 4.7261822, 50.9635574 ] }

Answer 1

To merge, use the lodash merge function, it does the trick

Answer 2

There is no reason to merge two objects. Just add the "loc" property to the original object. Also you need to call collectionDriver.save inside your callback so it happens only after geocoder.geocode is finished.

app.post('/:collection', function(req, response) {
    var object = req.body;
    var collection = req.params.collection;
    geocoder.geocode(object.address.street + object.address.no + object.address.zip + object.address.city, function(req, res) {
      object.loc = [res[0].longitude, res[0].latitude];
      console.log(object);
      collectionDriver.save(collection, object, function(error,docs) {
        if (error) { response.send(400, error); }
        else { response.send(201, docs);}
      });
    });
});