I have set up node and mongodb and have imported some yelp data into mongo. When I query using the mongo shell, I can see there are documents and everything is fine. However I'm unable to pass them along by adding them to an array and returning that array. When I hit up localhost:3000/api/reviews, I get a blank page. My console does log everything though so the node driver for mongo is working in getting the documents. Any ideas? I feel like it has something to do with the asynchronous nature of node.
var express = require('express');
var router = express.Router();
var MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
var url = 'mongodb://localhost:27017/YelpDB';
var getReviews = function(db, callback) {
var cursor = db.collection('reviews').find( );
//JSONArray jsonarray = new JSONArray();
var data = [];
cursor.each(function(err, doc) {
assert.equal(err, null);
if (doc != null) {
var jsonDoc = JSON.stringify(doc);
console.log(typeof jsonDoc);
data.push(jsonDoc);
} else {
callback();
}
});
return data;
};
router.get('/reviews/', function(req, res, next) {
//res.send('respond with a resource');
MongoClient.connect(url, function(err, db) {
assert.equal(null, err);
var data = getReviews(db, function() {
db.close();
});
res.json({"reviews": data});
});
});
Please try this one, you should return the data
at the end of cursor.each
in the callback
function.
var getReviews = function(db, callback) {
var cursor = db.collection('reviews').find( );
var data = [];
cursor.each(function(err, doc) {
if (err)
callback(err);
if (doc) {
var jsonDoc = JSON.stringify(doc);
console.log(typeof jsonDoc);
data.push(jsonDoc);
} else {
// at the end of cursor, return the data through callback
callback(null, data);
}
});
};
router.get('/reviews/', function(req, res, next) {
//res.send('respond with a resource');
MongoClient.connect(url, function(err, db) {
assert.equal(null, err);
getReviews(db, function(err, data) {
if (err)
throw err;
// send the data in callback function
res.json({"reviews": data});
db.close();
});
});
});
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