Here is what I'm trying:
contactModel.update({
'user_id': req.params.user_id,
'contacts.contact_id': req.params.id
}, {
$set: {
'contacts.$.name': req.body.contact.name,
'contacts.$.phone_number': req.body.contact.phone_number
}
})
But the code is only for updating specific key. I want to update it based on dynamic key. If name is coming in req.body then it should update only name both are coming, so it should update both.
Fill dinamically the update object with keys found in req.body
var obj = {};
for(var i in req.body.contact){
obj["contacts.$."+i] = req.body.contact[i];
}
contactModel.update({
'user_id': req.params.user_id,
'contacts.contact_id': req.params.id
}, {
$set: obj
})
Related
acUser is the field with existing data that I want to add to the collection
db.getCollection("old_user").find({id: 58})
.forEach((elm) => {
const userId = elm.id;
let userN = db.getCollection("user_new").find({ id: userId }).toArray()
if (userN) {
db.getCollection("old_user").updateOne({id: userId }, {$set: {newField: userN.acUser }});
}
})
I have a problem accessing the _id of the last created element inserted in to mongodbe.
is there any solution to just get the id, instead of getting all elements? especially if the data list is so long and nested so its really hard to pin the created element and gain access to his id
I am using mongoose driver on this one.
let updateDeptArr = await Budget.findOneAndUpdate(
// Dynamic
{
'_id': `${propertyValues[0]}`, // user ID
[`${keys[2]}._id`]: `${propertyValues[1]}`
},
{
'$push': {
[`${keys[2]}.$.${keys[3]}`]: propertyValues[3]
}
}, { _id: true, new: true }
).then(function (data) {
// we need to get and send The id of the last created element!!!
console.log(data[keys[2]]);
// let order = data[keys[1]].length - 1
// let id = data[keys[1]][`${order}`]._id
// res.json({ _id: id })
})
}
You can use select after query.
In the upcoming listing, you have a mongoose schema being used to query MongoDB, and just two fields are selected, as you want.
Loc
.findById(req.params.locationid)
.select('name reviews')//select chained
.exec();
Try to chain select to your call. It will just give back the name and reviews.
Try this:
let updateDeptArr = await Budget.findOneAndUpdate(
// Dynamic
{
'_id': `${propertyValues[0]}`, // user ID
[`${keys[2]}._id`]: `${propertyValues[1]}`
},
{
'$push': {
[`${keys[2]}.$.${keys[3]}`]: propertyValues[3]
}
}, { _id: true, new: true }
).select("_id")// not sure if Mongoose will chain this way
.then(function (data) {
// we need to get and send The id of the last created element!!!
console.log(data[keys[2]]);
// let order = data[keys[1]].length - 1
// let id = data[keys[1]][`${order}`]._id
// res.json({ _id: id })
})
}
This is how I store each element in my mongodb collection.
{
_id: 'iTIBHxAb8',
title: 'happy birthday',
votesObject: { happy: 0, birthday: 0 }
}
I made a very dirty work around which I am not at all proud of which is this...
//queryObject= {id,chosenvalue};
let queryObject = req.query;
let id = Object.keys(queryObject)[0];
let chosenValue = queryObject[id];
db.collection("voting")
.find({ _id: id })
.toArray((err, data) => {
let { votesObject } = data[0];
votesObject[chosenValue] += 1;
data[0].votesObject = votesObject;
db.collection("voting").replaceOne({ _id: id }, data[0]);
res.redirect("/polls?id=" + id);
});
So basically what this does is It gets the chosen value which may be "happy" or the "birthday" from the above example.
Finding the complete object from the collection which matches the id.
Incrementing the chosen value from the found object.
Using replaceOne() to replace the previous object with the newly changed object.
I am incrementing the value inside chosen value by one everytime this piece of code executes.
This works perfectly fine but I want to know if there is any way to directly update the chosen value without all this mess. I could not find a way to do it else where.
you can use mongoose findOneAndUpdate
It will be something like
const updateKey = "votesObject.$."+ chosenValue
let incQuery = {}
incQuery[updateKey] = 1
Model.findOneAndUpdate(
{ _id: id },
{ $inc: incQuery },
{ new : false },
callback
)
You can use $inc operator.
Try something like this:
db.collection.update({
"_id": id
},
{
"$inc": {
"votesObject.birthday": 1
}
})
This query will increment your field birthday in one.
Check mongo playground exaxmple here
Well I have the following doubt. I have the following:
JSON
[
{"name": "juan", "age": 10}
{"name": "pedro", "age": 15}
{"name": "diego", "age": 9}
]
User Schema
_group:{
type: mongoose.Schema.Types.ObjectId,
ref: 'Group'
},
name: {
type: String
},
age: {
type: Number
}
And I need to save or update this data in different docs with nodejs/mongoose. I planned to do the following
var data = JSON.parse(json)
for (var i = data.length - 1; i >= 0; i--) {
var name = data[i].name;
var age = data[i].age;
User.find({'name': par, '_group': group_id}, (err, user)=>{
if(err)
next(err);
// if it does not exist, create new doc
if(_.isEmpty(doc)){
var newuser = new User;
newuser.name = name;
newuser.age = age;
newuser.save((err, saved)=>{
})
}// if it exists, update it
else if(!_.isEmpty(doc)){
user.age = age;
user.save((err, saved)=>{
})
}
})
}
as you will see, the variables age and name within User.find remain undefined, so this does not work for me.
First of all, is it the right way to save this data? If so, how could I can use the for cycle variables (name and age) within User.find? If not, what do you recommend me to do?
Thanks,
Eduardo
NodeJS, ExpressJS, Mongoose
There is one more issue which I think you are facing that you are calling a method inside a loop and it takes a call-back, so it doesn't wait here for coming back and move to second iteration, so you might face undefined and some un-expected behavior.
I suggest you should use async/await
let user = await User.findOneAndUpdate({'name': par, '_group': group_id}, { name, age }, { upsert: true })
If you parsed given JSON well and assigned values to name and age, they are not undefined within User.find scope.
Did you checked those variables?
var name = data[i].name;
var age = data[i].age;
You can use mongoose findOneAndUpdate with the option { upsert: true }.
This tries to update an object in the DB and, if the object is not found, it creates it. So:
for (var i = data.length - 1; i >= 0; i--) {
var name = data[i].name;
var age = data[i].age;
User.findOneAndUpdate({'name': par, '_group': group_id}, { name, age }, { upsert: true, new: true, lean: true }, (err, updated) => {
if(err) console.log(err);
else console.log(updated);
})
}
The option new tells to return the updated object and the option lean tells to return a plain JSON, instead of Mongoose document object (the same as calling doc.toJson())
Using the upsert option, you can use findOneAndUpdate() as a find-and-upsert operation. An upsert behaves like a normal findOneAndUpdate() if it finds a document that matches filter. But, if no document matches filter, MongoDB will insert one by combining filter and update as shown below.
data.forEach( user => {
User.findOneAndUpdate({'name': user.name , '_group': group_id}, user , {upsert: true, new: true}, (err, data) => {
if(err) console.log(err);
console.log(data);
})
})
I am working on a MEAN stack application in which i defined a model using following schema:
var mappingSchema = new mongoose.Schema({
MainName: String,
Addr: String,
Mapping1: [Schema1],
Mappings2: [Schema2]
},
{collection : 'Mappings'}
);
I am displaying all this data on UI and Mapping1 & Mapping2 are displayed in the 2 tables where I can edit the values. What I am trying to do is once I update the values in table I should update them in database. I wrote put() api where I am getting these two updated mappings in the form of object but not able to update it in database. I tried using findAndModify() & findOneAndUpdate() but failed.
Here are the Schema1 & Schema2:
const Schema1 = new mongoose.Schema({
Name: String,
Variable: String
});
const Schema2 = new mongoose.Schema({
SName: String,
Provider: String
});
and my put api:
.put(function(req, res){
var query = {MainName: req.params.mainname};
var mapp = {Mapping1: req.params.mapping1, Mapping2: req.params.mapping2};
Mappings.findOneAndUpdate(
query,
{$set:mapp},
{},
function(err, object) {
if (err){
console.warn(err.message); // returns error if no matching object found
}else{
console.log(object);
}
});
});
Please suggest the best to way update those two arrays.
UPDATE :
I tried this
var mapp = {'Mapping2': req.params.mapping2};
Mappings.update( query ,
mapp ,
{ },
function (err, object) {
if (err || !object) {
console.log(err);
res.json({
status: 400,
message: "Unable to update" + err
});
} else {
return res.json(object);
}
});
what I got is
My array with size 3 is saved as String in Mapping2 array.
Please help. Stuck badly. :(
From Mongoose's documentation I believe there's no need to use $set. Just pass an object with the properties to update :
Mappings.findOneAndUpdate(
query,
mapp, // Object containing the keys to update
function(err, object) {...}
);