Define MongoDB Collection in REST API GET Request

Question

I have data in 2 seperate collections stored in the same MongoDB database. Is there a way to define in the HTTP GET request query string from which collection the data should be retrieved. I use the following JS to process the query:

const findDocuments = function(db, callback) {
const collection = db.collection('THIS should come from the query string');
collection.find(query).toArray(function(err, docs) {
  assert.equal(err, null);
  callback(docs);   
});
  };
};

The App is setup in Node.js using express

dataRouter.route('/data')
.post(function(req, res){
    var query =req.query;
    //console.log(query);

    getResult(query, function(data){
        console.log('query done');
        //console.log(data);
        res.json(data);
    });
    module.exports = {
        query: query
    };
});

app.use('/api', dataRouter);

Answer 1

In the example you shared, you are declaring a POST method, not a GET. Any case, in a GET method you could send a query parameter that identify which collection you want to use. Image you send a query param called collection

http://myhost/data?collection=1

and you could extract that query param with:

var numberCollection = req.query.collection;