I've got the following schema
var UserSchema = new Schema({
emp_no: Number,
skills: [{
skill: {
type: Schema.Types.ObjectId,
ref: 'Skill'
},
startDate: {type: Date},
}]
});
I'm then trying to update the startDate of one particular skill. I've tried several differents ways, one of them being:
User.findOne({emp_no: req.body.emp_no}, function (err, user) {
user.update( {'skills._id': 123}, {'$set': {
'skills.$.startDate': req.body.startDate
}}
}
This particular code gives: err: 'cannot use the part (skills of skills._id) to traverse the element
The actual object looks like
{
"_id" : ObjectId("5469753de27a7c082203fd0a"),
"emp_no" : 123,
"skills" : [
{
"skill" : ObjectId("547d5f3021d99d302079446d"),
"startDate" : ISODate("2014-12-02T06:43:27.763Z")
"_id" : ObjectId("547d5f8f21d99d3020794472")
}
],
"__v" : 108
}
Any ideas what I'm doing wrong?
When you call update on a model instance like you're doing here, the first parameter is the update operation to apply to that document, as the document to update is already uniquely identified by its _id.
Instead, use Model.update to do this all in one operation:
User.update(
{emp_no: req.body.emp_no, 'skills._id': 123},
{'$set': {
'skills.$.startDate': req.body.startDate
}},
function(err, numAffected) {...}
);
Related
Here i'm trying to update with the userid, trackTime fields. Evertime userid and trackTime will be different so i'm using $addToSetbut here i'm facing an error
like this i'm passing the data in postman:-
{
"courseId":"61001184afeacb22ac1668e0",
"userId":"60f6fe96a1a44a1fb4a59573",
"trackingTime":"4"
}
this is the schema:-
usersEnrolled : [{
iscourseenrolled : { type:Boolean, default: false },
userId: {type: String },
trackTime: {type:String}
}],
code:-
const updatedTrackTime = await Courses.updateOne({ "_id" : req.body.courseId},{
$addToSet:{
"usersEnrolled.0.userId" : req.body.userId,
"usersEnrolled.0.trackTime": req.body.trackingTime
}})
The reason for that error is probably because you didn't specify the array field (Actually you didn't specify any field at all). Try to add your usersEnrolled field like this:
const updatedTrackTime = await Courses.updateOne({ "_id" : req.body.courseId},{
$addToSet:{
usersEnrolled: {
"usersEnrolled.0.userId" : req.body.userId,
"usersEnrolled.0.trackTime": req.body.trackingTime
}
}});
To get more details on $addToSet use MongoDB Manual
https://docs.mongodb.com/manual/reference/operator/update/addToSet/
I just changed in to these and it worked for me
const updatedTrackTime = await Courses.updateOne({ "_id" : req.body.courseId},{ $addToSet:{
usersEnrolled : {
userId : req.body.userId,
trackTime: req.body.trackingTime
}
I'm defining a mongoose schema like this
var accountPostSchema = new mongoose.Schema({
account: {
id: { type: mongoose.Schema.Types.ObjectId, ref: 'Account' }
},
post: {
id: { type: mongoose.Schema.Types.ObjectId, ref: 'Post' }
}
});
app.db.model('AccountPost', accountPostSchema);
When a user(account holder) create a post, I save the post in a Post schema and get the 'postId'. Then I save the 'postId' and the 'accountId'
in the above accountPostSchema like this
var fieldsToSet = {
post: {
id: postId
},
account: {
id: accountId
}
};
db.models.AccountPost.create(fieldsToSet, function(err, accountPost) {
if (err) {
// handle error
}
// handle success
});
After entering few postId's and accountId's, I see the following results in the mongo shell
> db.accountposts.find({})
{ "_id" : ObjectId("5835096d63efc04da96eb71e"), "post" : { "id" : ObjectId("5835096d63efc04da96eb71d") }, "account" : { "id" : ObjectId("5833c920c868d7264111da69") }, "__v" : 0 }
{ "_id" : ObjectId("583509e12052c7a2a93c4027"), "post" : { "id" : ObjectId("583509e12052c7a2a93c4026") }, "account" : { "id" : ObjectId("5833c920c868d7264111da69") }, "__v" : 0 }
Now how do I find all the matching 'Posts' given an accountId? (not the postId's)
For example if I the accountId is 583509e12052c7a2a93c4026, I need to find Posts with Post._id=5835096d63efc04da96eb71d and Post._id=583509e12052c7a2a93c4026
What is the query I should run to get the matching Posts?
I think, you should follow this way to get all the posts associated with particular accountid.
db.accountposts.find({'account.id' : accountId})
.populate('post.id')
.exec();
First, I would suggest changing your Schema to the following
var accountPostSchema = new mongoose.Schema({
account: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Account'
},
post: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Post'
}
});
This actually makes more sense, especially when you try to populate the subdocuments. Actually, I would say this Schema is useless. Why don't you define your Post schema like the following?
var PostSchema = new mongoose.Schema({
poster: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Account'
},
message: String
});
If you use the latter code, you could execute the following query to get all posts by a particular user:
db.posts.find({poster: accountId}, function(dbErr, userPosts) {
if(dbErr) {
// Handle the error.
}
// Do something with the posts by accountId in the array userPosts.
});
The advantages of removing the id field from poster becomes clear once you try to populate poster. If you defined poster as an object with the field id and try to populate it, you will need to access data about the poster as such:
posterName = retrievedPost.poster.id.name;
Alternatively, by just making the poster field an ObjectId directly, you can access the populated user more directly:
posterName = retrievedPost.poster.name;
i'm new in mongodb and mongoose. i'm using node js, and i want to find and update specific field in one of array in sub document.
here is my data structure :
var PostSchema = new Schema({
title: String,
comment: [
{
name: String,
value: String
}
],
createdAt: Date,
updateAt: Date
})
this is my data example :
{
_id : 12,
title : 'some article here...',
comment : [{
_id : 1,
name : 'joe',
value : 'wow that fantastic...'
},{
_id : 2,
name : 'rocky',
value : 'really... thats insane...'
},{
_id : 3,
name : 'jane',
value : 'i think its impossible to do...'
}],
createdAt : 2016-04-14 04:50:54.760Z,
updatedAt : 2016-04-14 04:50:54.760Z
}
i need to update comment which have _id : 2, i want to change the value become 'what???'. i try to update with :
Post.findOne({'_id': 12, 'comment._id': 2}, {_id: 0, 'comment.$': 1}, function (err, cb) {
cb.comment.value = 'what???'
cb.save()
})
but it failed... so, can you help me? Thanks
you can use findOneAndUpdate and positional operator $ to update specific comment value
Post.findOneAndUpdate({"_id": 12, "comment._id": 2},
{
$set: {
"comment.$.value ": "New value set here"
}
},
{ new: true } // return updated post
).exec(function(error, post) {
if(error) {
return res.status(400).send({msg: 'Update failed!'});
}
return res.status(200).send(post);
});
It will work for array updation in mongodb using mongoose
Post.findOneAndUpdate(
{ id: 12,comment_id:2 },
{ $push: { comment:"new comment" } }
)
It might be conceptual question about _id in mongodb.
I understand mongodb will insert a _id field automatically if you don't set key field in document.In my case, I defined a field as Object Array, I don't know why it always create a _id in each Object in Array of this field.
I do appreciate if someone could clarify it for me.
Mongoose Model Scheme definition:
module.exports = mongoose.model("Application", {
Name: String,
Description: String,
Dependency: [
{
App_id: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Application'
},
Priority: Number
}
]
});
This is an Update operation, request data is:
{ _id: '571953e33f33c919d03381b5',
Name: 'A Test Utility (cmd)',
Description: 'A Test Utility (cmd)'
Dependency:
[ { App_id: '571953e33f33c919d03381b6', Priority: true },
{ App_id: '571953e33f33c919d03383da', Priority: 0 } ]
}
I use this code to update it
var id = req.body._id;
Application.findOneAndUpdate({ _id: id }, req.body, function (err, app) {
if (err)
res.send(err);
res.json(app);
});
The update is successful.But the document in mongodb is:
{
"_id" : ObjectId("571953e33f33c919d03381b5"),
"Name" : "A Test Utility (cmd)",
"Description" : "A Test Utility (cmd)",
"Dependency" : [
{
"Priority" : 1,
"App_id" : ObjectId("571953e33f33c919d03381b6"),
"_id" : ObjectId("571a7f552985372426509acb")
},
{
"Priority" : 0,
"App_id" : ObjectId("571953e33f33c919d03383da"),
"_id" : ObjectId("571a7f552985372426509aca")
}
]
}
I just don't understand how come the _id in the "Dependency" Array?
Thanks.
When you use [{..}] that means inside it act as a sub schema and you know that MongoDB insert a _id field automatically if you don't set key field in document. So you need to force to insert document without _id field.
Need use {_id:false} for your Dependency array schema to insert without _id
var ApplicationSchema = new mongoose.Schema({
Name: String,
Description: String,
Dependency: [
{
App_id: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Application'
},
Priority: Number,
_id: false
}
]
});
module.exports = mongoose.model("Application", ApplicationSchema);
I am using mongoose to perform CRUD operation on my db. This is how my model looks.
var EmployeeSchema = new Schema({
name: String,
description: {
type: String,
default: 'No description'
},
department: [],
lastUpdated: {
type: Date,
default: Date.now
}
});
The department can contains array of object like this.
[
{
"id" : "55ba28f680dec4383eeebf97",
"text" : "Sales",
"topParentId" : "55ba28f680dec4383eeebf8b",
"topParentText" : "XYZ"
},
{
"id" : "55ba28f680dec4383eeebf98",
"text" : "IT",
"topParentId" : "55ba28f680dec4383eeebf8b",
"topParentText" : "XYZ"
},
{
"id" : "55ba28f680dec4383eeebf94",
"text" : "Marketing",
"topParentId" : "55ba28f680dec4383eeebccc",
"topParentText" : "ABC"
}
]
Now I need to find all the employee where department.id = '55ba28f680dec4383eeebf94' and then I need to update the text of the object.
Employee.find({'department.id': '55ba28f680dec4383eeebf94'}, function(err, Employees) {
_.each(Employees, function (emp) {
_.each(emp.department, function (dept) {
if(dept.id === '55ba28f680dec4383eeebf94'){
dept.text = 'XXXXX'; // How to update the employee to save the updated text
}
});
});
});
What is the right way to save the employee with updated text for that department?
Iterating is code is not a "sharp" way to do this. It is better to use the MongoDB update operators, especially since there is no schema defined for the array items here, so no rules to worry about:
Employee.update(
{'department.id': '55ba28f680dec4383eeebf94'},
{ "$set": { "department.$.text": "XXXXX" },
function(err,numAffected) {
// handling in here
}
);
The $set is the important part, otherwise you overwrite the whole object. As is the positional $ operator in the statement, so only the matched ( queried item in the array ) index is updated.
Also see .find**AndUpdate() variants for a way to return the modified object.
I think you can use the update model:
Employee.update({department.id: '55ba28f680dec4383eeebf94'}, {department.text: 'XXXXX'}, {multi: true},
function(err, num) {
console.log("updated "+num);
}
);
First object is the query, what to find: {department.id: '55ba28f680dec4383eeebf94'}, the second one is the update, what to update: {department.text: 'XXXXX'} and the third one is the options to pass to the update, multi means update every records you find: {multi: true}