It turns a funny error in Node.js mongodb, if I put the form below:
locals.collection.find(filter, req.query);
returns me the following error:
MongoError: query selector must be an object
Now if I manually put the query works.
I'm having this problem a long time, and I've tried several ways.
locals.collection.find({slug:'somak'}, req.query);
I am using the following function:
exports.findAll = function(req, res, next) {
var locals = {},
section = req.params.section,
query = req.query,
filter = {};
if(query.filter) {
filter = query.filter.replace(/"(\w+)"\s*:/g, '$1:');
filter = filter.replace(/["]/g, "'");
}
console.log(filter);
delete query.filter;
async.series([
function(callback) {
MongoClient.connect(url, function(err, db) {
if (err) return callback(err);
locals.collection = db.collection(section);
callback();
});
},
function(callback) {
locals.collection.count(filter, function (err, result){
if (err) return callback(err);
locals.count = result;
callback();
});
},
function(callback) {
var cursor = locals.collection.find({slug:'somak'}, req.query);
if(req.query.page) {
cursor = cursor.skip(Math.abs(req.query.limit) * --req.query.page);
}
cursor.toArray(function(err, docs) {
if (err) return callback(err);
locals.docs = docs;
callback();
});
}
],
function(err) { //This function gets called after the three tasks have called their "task callbacks"
if (err) return next(err);
// Here locals will be populated with 'count' and 'docs'
res.json({
count: locals.count,
data: locals.docs
});
});
Just use JSON.parse:
exports.findAll = function(req, res, next) {
var locals = {},
section = req.params.section,
query = req.query,
filter = {};
if(query.filter) {
filter = JSON.parse(query.filter);
}
delete query.filter;
...
Related
I have a function which uses async.parallel function to call two functions. But I don't know how to handle errors when async.parallel is used. If one of the two functions throw errors, how do I handle them?
exports.getProductconfigWithProductList = function(req, res){
var apiVersion = req.param('version', null);
var product_id = req.params.productId;
dbDriver = determineDriver('es');
async.parallel([
function(callback) {
dbDriver.getProductconfig(product_id,function(data){
callback(null, data);
});
},
function(callback) {
var productListPromise = getProductListData();
productListPromise.then(function(data) {
callback(null, data);
});
}
],
function(err, results) {
if(!err){
var data = results[0];
data[1] = results[1];
res.send(data);
res.end();
} else {
console.log('<<<<<<<<<<<<<<'+err+'>>>>>>>>>>>>>>>');
res.send(err);
res.end();
}
}
);
};
When you have:
async.parallel([
func1,
func2,
], (err, data) => {
if (err) {
// you handle the errors here
}
});
It's explained in more detail in the docs:
https://caolan.github.io/async/docs.html
and in the issue on GitHub here:
https://github.com/caolan/async/issues/334
I'm having trouble getting to use the query mongodb.
I do not know if I could detail the method used is being sent an object, but is being rejected or sometimes the filter back empty.
it always returns me an error:
MongoError: query selector must be an object
The entry of the query is being thereby:
{ filter: 'f', limit: '5', page: '1', sort: '-posted' }
My server Route:
exports.findAll = function(req, res, next) {
var locals = {},
section = req.params.section,
query = req.query,
filter = {};
if(query.filter) {
filter = query.filter.replace(/"(\w+)"\s*:/g, '$1:');
filter = filter.replace(/["]/g, "'");
}
console.log(filter);
delete query.filter;
async.series([
function(callback) {
MongoClient.connect(url, function(err, db) {
if (err) return callback(err);
locals.collection = db.collection(section);
callback();
});
},
function(callback) {
locals.collection.count(filter, function (err, result){
if (err) return callback(err);
locals.count = result;
callback();
});
},
function(callback) {
//var cursor = locals.collection.find(filter);
var cursor = locals.collection.find(filter, req.query);
// if(req.query.order) {
// cursor = cursor.sort();
// }
//
// if(req.query.limit) {
// cursor = cursor.limit(Math.abs(req.query.limit));
//
if(req.query.page) {
cursor = cursor.skip(Math.abs(req.query.limit) * --req.query.page);
}
// }
cursor.toArray(function(err, docs) {
if (err) return callback(err);
locals.docs = docs;
callback();
});
}
],
function(err) { //This function gets called after the three tasks have called their "task callbacks"
if (err) return next(err);
// Here locals will be populated with 'count' and 'docs'
res.json({
count: locals.count,
data: locals.docs
});
});
};
i change the function server, adn now my response is:
{ filter: {situation: 't'}, limit: '5', page: '1', sort: '-posted' }
And same error :( :(
I am writing the filter using mongodb native driver, but it's driving me this error when you run the query.
In the case of this driver, it has no exec?
What is another way to perform this query?
exports.findAll = function(req, res) {
MongoClient.connect(url, function(err, db) {
var section = req.params.section;
var collection = db.collection(section);
var filter = req.query.filter ? {nameToLower: new RegExp('^' + req.query.filter.toLowerCase())} : {};
var query = collection.find(filter);
var count = 0;
collection.count(filter, function (error, result) {
count = result;
});
if(req.query.order) {
query.sort(req.query.order);
}
if(req.query.limit) {
query.limit(req.query.limit);
if(req.query.page) {
query.skip(req.query.limit * --req.query.page);
}
}
query.exec(function (error, results) {
res.json({
count: count,
data: results
});
});
});
};
Error:
TypeError: undefined is not a function
Better to use the async library in this case as it simplifies the code. In the case where you need to run multiple tasks that depend on each other and when they all finish do something else, use the
async.series() module. The following demonstrates how you can go about this in your case:
exports.findAll = function(req, res) {
var locals = {},
section = req.params.section,
filter = !!req.query.filter ? {nameToLower: new RegExp('^' + req.query.filter.toLowerCase())} : {};
async.series([
// Connect to DB
function(callback) {
MongoClient.connect(url, function(err, db) {
if (err) return callback(err);
locals.collection = db.collection(section); //Set the collection here, so the next task can access it
callback();
});
},
// Get count
function(callback) {
locals.collection.count(filter, function (err, result){
if (err) return callback(err);
locals.count = result; //Set the count here
callback();
});
},
// Query collection
function(callback) {
var cursor = locals.collection.find(filter);
if(req.query.order) {
cursor = cursor.sort(req.query.order);
}
if(req.query.limit) {
cursor = cursor.limit(req.query.limit);
if(req.query.page) {
cursor = cursor.skip(req.query.limit * --req.query.page);
}
}
cursor.toArray(function(err, docs) {
if (err) return callback(err);
locals.docs = docs;
callback();
});
}
], function(err) { //This function gets called after the three tasks have called their "task callbacks"
if (err) return next(err);
// Here locals will be populated with 'count' and 'docs'
res.json({
count: locals.count,
data: locals.docs
});
res.render('user-profile', locals);
});
};
Below is my code
var mongodb = require('mongodb');
var MongodbClient = mongodb.MongoClient;
MongodbClient.connect('mongodb://localhost/test', function(err, db) {
db.collection('contact', function(err, collection) {
collection.find({}, function(err, rows) {
for(var index in rows)
console.log(rows[index]);
});
});
var contact = db.collection('contact');
contact.insert({
name:'Fred',
tel:'123456789',
address: 'Mars',
}, function(err, docs) {
if(err){
console.log("failed")
return;
}
else{
console.log('Success');
}
});
contact.find({}, function(err, docs) {
if(err) {
console.log("Can not find any!");
return;
}
for(var index in docs) {
console.log(docs.length);
var doc = docs[index];
console.log(doc.name);
}
});
});
I can find the data using mongodb shell but in node, it shows
TypeError: Cannot read property 'name' of null
on console.log(doc.name).
and also shows "undefined" when try to console.log(docs.length);
Did I do something wrong?
You are not using correctly the mongodb node API:
You should have:
contact.find({}).toArray(function(err,results) {
if (err) {
console.debug(err);
return;
}
console.debug(JSON.stringify(results));
});
More on docs.
You can try JSON.stringify(object) and then JSON.parse(object) and then try to access the property.
let xxxxxxxx = async (req, res) => {
let resultSet = [];
let object;
let perDayData = await yyyyyyyyyyy.find({});
perDayData = JSON.stringify(perDayData);
perDayData = JSON.parse(perDayData);
console.log(perDayData[0].field);
}
Hi I have this code but when finish the result is not the espected because didn't run in the sequence that I wish
here is the code:
var user_data = {};
models.games.find({$or: [{w_id: req.user._id}, {b_id: req.user._id}, {owner: req.user._id}]}, function (err, games) {
var req_games = [];
if (!err) {
for (var i in games) {
req_games.push(games[i]);
models.users.findOne({_id: games[i].w_id}, function (err, user) {
req_games[i].w_id = user.user;
console.log(req_games[i].w_id) //< -- 3
});
console.log('a ' + req_games[i].w_id) //<-- 2
}
user_data.games = req_games; // <-- 1
}
});
at the end of the task req_games didnt have any update because it's running in the sequence that I put in the comments in the code
This may help you using Q(promises)
obj.find = function(model, condition) { //make your find to return promise
var deferred = q.defer();
model.find(condition, function(err, results) {
if (err) {
logger.log(err);
deferred.reject(err);
} else {
deferred.resolve(results);
}
});
return deferred.promise;
}
ArraysOfId.forEach(function (id) {
var tempProm = mongoUtilsMethodObj.find(schemaObj.Asset, id).then(function (assetObj) {
---- your code
return q.resolve();
});
promArr.push(tempProm);//push all promise to array
});
q.all(promArr).then(function () {
// this will be called when all promise in array will we resolved
})
Here is a version using the async library to map your game values.
var async = require('async');
var user_data = {};
models.games.find({$or: [{w_id: req.user._id}, {b_id: req.user._id}, {owner: req.user._id}]}, function (err, games) {
if(err) {
// or whatever your error response happens to be
return res.render('user.swig', {error: err});
}
async.map(games, function(game, nextGame) {
models.users.findOne({_id: game.w_id}, function (err, user) {
game.w_id = user.user;
nextGame(err, game);
});
}, function(err, req_games) {
user_data.games = req_games;
res.render('user.swig', {user: user_data});
});
});