I have JSON with 10000 unique records and I need to add another field with a unique value to every record. How do I add that?
[
{
_id: "5fffd08e62575323d40fca6f",
wardName: "CIC",
region: "ABC",
location: "AAA",
specialism: "CSR",
__v: 0
},
.
.
.
]
The JSON is stored in variable showWard. How do I add an action field in my JSON with value = './wardName' where wardName is already a field in my JSON?
This is my current code:
app.get('/wards', function (req, res) {
Ward.find({}, function (err, showWard) {
if (err) { console.log(err); return; }
return res.send(showWard);
});
});
Using a .map()? I don't know the logic for determinate the gender, but in Ward.find() callback you can add a thing like that:
app.get('/wards', function (req, res) {
Ward.find({}, function (err, showWard) {
if (err) { console.log(err); return; }
const newShowWard = showWard.map(ward => {
ward.gender = "BOH";
return ward;
})
return res.send(newShowWard);
});
});
Related
My .findOneAndUpdate method is returning user as null and isn't ending up updating the information. Everything seems to be in order, I'm not getting any erros.
EDIT: I have made progress, I was able to finally update the GroupID, but its setting it as null. Instead of the passed in string.
router.put("/update", (req, res) => {
Users.findOneAndUpdate(
{ _id: req.body.id },
{
$set: { GroupID: req.body.GroupID }
},
{ new: true },
(err, user) => {
if (err) res.send(err);
else res.send("Account GroupID Updated" + user);
}
);
});
You have to convert req.body.id to objectId as follows:
var mongoose = require('mongoose');
var id = mongoose.Types.ObjectId(req.body.id);
Users.findOneAndUpdate(
{ _id: id }
I am trying to extend the amount of fields that our API is returning. Right now the API is returning the student info by using find, as well as adding some information of the projects by getting the student info and using findOne to get the info about the project that the student is currently registered to.
I am trying to add some information about the course by using the same logic that I used to get the project information.
So I used the same findOne function that I was using for Projects and my logic is the following.
I created a variable where I can save the courseID and then I will put the contents of that variable in the temp object that sending in a json file.
If I comment out the what I added, the code works perfectly and it returns all the students that I require. However, when I make the additional findOne to get information about the course, it stops returning anything but "{}"
I am going to put a comment on the lines of code that I added, to make it easier to find.
Any sort of help will be highly appreciated!
User.find({
isEnrolled: true,
course: {
$ne: null
}
},
'email pantherID firstName lastName project course',
function(err, users) {
console.log("err, users", err, users);
if (err) {
return res.send(err);
} else if (users) {
var userPromises = [];
users.map(function(user) {
userPromises.push(new Promise(function(resolve, reject) {
///////// Added Code START///////
var courseID;
Course.findOne({
fullName: user.course
}, function(err, course) {
console.log("err, course", err, course);
if (err) {
reject('')
}
courseID = course ? course._id : null
//console.log(tempObj)
resolve(tempObj)
}),
///// ADDED CODE END //////
Project.findOne({
title: user.project
}, function(err, proj) {
console.log("err, proj", err, proj);
if (err) {
reject('')
}
//Course ID, Semester, Semester ID
//map to custom object for MJ
var tempObj = {
email: user.email,
id: user.pantherID,
firstName: user.firstName,
lastName: user.lastName,
middle: null,
valid: true,
projectTitle: user.project,
projectId: proj ? proj._id : null,
course: user.course,
courseId: courseID
}
//console.log(tempObj)
resolve(tempObj)
})
}))
})
//async wait and set
Promise.all(userPromises).then(function(results) {
res.json(results)
}).catch(function(err) {
res.send(err)
})
}
})
using promise could be bit tedious, try using async, this is how i would have done it.
// Make sure User, Course & Project models are required.
const async = require('async');
let getUsers = (cb) => {
Users.find({
isEnrolled: true,
course: {
$ne: null
}
}, 'email pantherID firstName lastName project course', (err, users) => {
if (!err) {
cb(null, users);
} else {
cb(err);
}
});
};
let findCourse = (users, cb) => {
async.each(users, (user, ecb) => {
Project.findOne({title: user.project})
.exec((err, project) => {
if (!err) {
users[users.indexOf(user)].projectId = project._id;
ecb();
} else {
ecb(err);
}
});
}, (err) => {
if (!err) {
cb(null, users);
} else {
cb(err);
}
});
};
let findProject = (users, cb) => {
async.each(users, (user, ecb) => {
Course.findOne({fullName: user.course})
.exec((err, course) => {
if (!err) {
users[users.indexOf(user)].courseId = course._id;
ecb();
} else {
ecb(err);
}
});
}, (err) => {
if (!err) {
cb(null, users);
} else {
cb(err);
}
});
};
// This part of the code belongs at the route scope
async.waterfall([
getUsers,
findCourse,
findProject
], (err, result) => {
if (!err) {
res.send(result);
} else {
return res.send(err);
}
});
Hope this gives better insight on how you could go about with multiple IO transactions on the same request.
req.body.courses has multiples id's of courses that I want to add to a specific categorie, the problem is that when my code runs it save a course more that one time, sometimes four or five times, depending on the number of loops it does.
The function:
router.post('/categories/:cat_id/', function (req, res) {
Categorie.findById(req.params.cat_id, function(err, categorie){
if(err){
console.log(err);
} else {
var courses = req.body.courses;
courses.forEach(function (course){
Course.findOne({ _id: course }, function(err, foundCourse) {
if(err){
console.log(err);
} else {
categorie.courses.push(foundCourse._id);
categorie.save();
}
});
});
}
});
return res.redirect('/dash');
});
The CategorieSchema:
var categorieSchema = mongoose.Schema({
name: String,
courses: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Course"
}
]
});
Here is an example of trying to add 4 courses to the categorie:
{ "_id" : ObjectId("5a871964a6b4820ecf7abaa7"), "courses" : [ ObjectId("5a870a7374486e0b0d69f710"), ObjectId("5a870a7a74486e0b0d69f711"), ObjectId("5a870a6974486e0b0d69f70f"),
ObjectId("5a870a7374486e0b0d69f710"), ObjectId("5a870a7a74486e0b0d69f711"), ObjectId("5a870a6974486e0b0d69f70f"),
ObjectId("5a870a7374486e0b0d69f710"), ObjectId("5a870a7a74486e0b0d69f711"), ObjectId("5a870a6974486e0b0d69f70f") ], "name" : "test2", "__v" : 3 }
Node.js Is async, It does not wait for the loop to execute completely and each time you are adding _id in existing array because of that adds 2-3 times.
Try this once I have not tested this.
const findOne = (course) => {
return new Promise((resolve, reject) => {
Course.findOne({
_id: course
}, (err, foundCourse) => {
if (err)
return reject(err);
return resolve(foundCourse._id);
});
});
}
router.post('/categories/:cat_id/', function (req, res) {
Categorie.findById(req.params.cat_id, function (err, categorie) {
if (err) {
console.log(err);
res.status(400).json(err);
} else {
var courses = req.body.courses;
Promise.all(courses.map((course) => {
return findOne(course);
})).then((data) => {
// check if course id already there skip
data = data.filter((course) => {
return !categorie.courses.includes(course);
});
categorie.courses = categorie.courses.concat(data);
categorie.save();
return res.redirect('/dash');
}).catch((err) => {
console.log(err);
res.status(400).json(err);
});
}
});
});
An alternative would involve a first query returning the courses using $in operator with Course.find() and then update the courses array in the Categorie model with Categorie.findByIdAndUpdate():
router.post('/categories/:cat_id/', function (req, res) {
Course.find({ '_id': { '$in': req.body.courses }}).exec((err, courses) => {
Categorie.findByIdAndUpdate(
req.params.cat_id,
{ '$addToSet': { 'courses': courses } },
{ 'new': true },
(err, categorie) => {
if (err){
console.log(err);
} else {
return res.redirect('/dash');
}
}
});
});
});
I have a big issue with my function in sails.js (v12). I'm trying to get all userDetail using async (v2.3) for deep populating my user info:
UserController.js:
userDetail: function (req, res) {
var currentUserID = authToken.getUserIDFromToken(req);
async.auto({
//Find the User
user: function (cb) {
User
.findOne({ id: req.params.id })
.populate('userFollowing')
.populate('userFollower')
.populate('trips', { sort: 'createdAt DESC' })
.exec(function (err, foundedUser) {
if (err) {
return res.negotiate(err);
}
if (!foundedUser) {
return res.badRequest();
}
// console.log('foundedUser :', foundedUser);
cb(null, foundedUser);
});
},
//Find me
me: function (cb) {
User
.findOne({ id: currentUserID })
.populate('myLikedTrips')
.populate('userFollowing')
.exec(function (err, user) {
var likedTripIDs = _.pluck(user.myLikedTrips, 'id');
var followingUserIDs = _.pluck(user.userFollowing, 'id');
cb(null, { likedTripIDs, followingUserIDs });
});
},
populatedTrip: ['user', function (results, cb) {
Trip.find({ id: _.pluck(results.user.trips, 'id') })
.populate('comments')
.populate('likes')
.exec(function (err, tripsResults) {
if (err) {
return res.negotiate(err);
}
if (!tripsResults) {
return res.badRequest();
}
cb(null, _.indexBy(tripsResults, 'id'));
});
}],
isLiked: ['populatedTrip', 'me', 'user', function (results, cb) {
var me = results.me;
async.map(results.user.trips, function (trip, callback) {
trip = results.populatedTrip[trip.id];
if (_.contains(me.likedTripIDs, trip.id)) {
trip.hasLiked = true;
} else {
trip.hasLiked = false;
}
callback(null, trip);
}, function (err, isLikedTrip) {
if (err) {
return res.negotiate(err);
}
cb(null, isLikedTrip);
});
}]
},
function finish(err, data) {
if (err) {
console.log('err = ', err);
return res.serverError(err);
}
var userFinal = data.user;
//userFinal.trips = data.isLiked;
userFinal.trips = "test";
return res.json(userFinal);
}
);
},
I tried almost everthing to get this fix but nothing is working...
I am able to get my array of trips(data.isLiked) but I couldn't get my userFInal trips.
I try to set string value on the userFinal.trips:
JSON response
{
"trips": [], // <-- my pb is here !!
"userFollower": [
{
"user": "5777fce1eeef472a1d69bafb",
"follower": "57e44a8997974abc646b29ca",
"id": "57efa5cf605b94666aca0f11"
}
],
"userFollowing": [
{
"user": "57e44a8997974abc646b29ca",
"follower": "5777fce1eeef472a1d69bafb",
"id": "5882099b9c0c9543706d74f6"
}
],
"email": "test2#test.com",
"userName": "dany",
"isPrivate": false,
"bio": "Hello",
"id": "5777fce1eeef472a1d69bafb"
}
Question
How should I do to get my array of trips (isLiked) paste to my user trips array?
Why my results is not what I'm expecting to have?
Thank you for your answers.
Use .toJSON() before overwriting any association in model.
Otherwise default toJSON implementation overrides any changes made to model associated data.
var userFinal = data.user.toJSON(); // Use of toJSON
userFinal.trips = data.isLiked;
return res.json(userFinal);
On another note, use JS .map or _.map in place of async.map as there is not asynchronous operation in inside function. Otherwise you may face RangeError: Maximum call stack size exceeded issue.
Also, it might be better to return any response from final callback only. (Remove res.negotiate, res.badRequest from async.auto's first argument). It allows to make response method terminal
I have a JSON in this format:
{
_id:5522ff94a1863450179abd33,
userName:'bill',
__v:3,
friends:[
{
_id:55156119ec0b97ec217d8197,
firstName:'John',
lastName:'Doe',
username:'johnDoe'
},
{
_id:5515ce05207842d412c07e03,
lastName:'Adam',
firstName:'Foo',
username:'adamFoo'
}
]
}
And I would like to remove whole corresponding subarray. For example I want to remove user John Doe with ID 55156119ec0b97ec217d8197 so the result will be:
{
_id:5522ff94a1863450179abd33,
userName:'bill',
__v:3,
friends:[
{
_id:5515ce05207842d412c07e03,
lastName:'Adam',
firstName:'Foo',
username:'adamFoo'
}
]
}
So far I have this:
exports.delete = function (req, res) {
var friends = req.friends[0];
friends.update(
{'_id': req.body.friendsId},
{$pull: {'friends.friends': {_id: req.body.friendId}}}, function (err) {
if (err) {
return res.status(400).send({
message: getErrorMessage(err)
});
} else {
res.json(friends);
}
});
};
But without result and also I'm not getting any error, it will stay just same as before. req.body.friendsId is ID of main array and req.body.friendId is ID of specific user which I want to pull.
Change your update query to this:
exports.delete = function (req, res) {
var friends = req.friends[0]; // assuming the friends object is your mongodb collection
friends.update(
{ '_id': req.body.friendsId },
{ $pull: {'friends': { _id: req.body.friendId } } }, function (err) {
if (err) {
return res.status(400).send({
message: getErrorMessage(err)
});
} else {
res.json(friends);
}
});
};
This will search for documents which have the friends array element _id value = req.body.friendsId and removes the specific array element from that array using the $pull operator.