I can't push items into MongoDB array every time that i try to push a new element it creates an empty object and i cant figure out why,
I already used the
Collection.Array.push({element})&
Collection.save()
but i cant figure out a solution
This is My Schema
const Schema = mongoose.Schema;
var ParticipantSchema = new Schema({
nom:{Type:String},
prenom:{Type:String},
email:{Type:String}
})
var CompetitionSchema = new Schema({
nom:String,
date:Date,
place:String,
participant :[ParticipantSchema]
})
module.exports = mongoose.model("Competition",CompetitionSchema);
This is my funtion
exports.addParticipant=function(req,res){
var newParticipant={
"nom":req.body.nom,
"prenom":req.body.prenom,
"email":req.body.email
}
Competition.updateOne(
{ _id:req.body.id},
{ $push: { participant: newParticipant } },
(err,done)=>{
return res.json(done)
}
);
}
the result is always an empty object like below
{
"_id": "5ded0eeb85daa100dc5e57bf",
"nom": "Final",
"date": "2019-01-01T23:00:00.000Z",
"place": "Sousse",
"participant": [
{
"_id": "5ded0eeb85daa100dc5e57c0"
},
{
"_id": "5dee3c1b08474e27ac70672e"
}
],
"__v": 0
}
There is no problem in your code, the only problem is that in schema definition you have Type, but it must be type.
If you update your ParticipantSchema like this, it will work:
var ParticipantSchema = new Schema({
nom: { type: String },
prenom: { type: String },
email: { type: String }
});
You are using another Schema in the Array. This results in so-called subdocuments (https://mongoosejs.com/docs/subdocs.html). Mongoose does not populate subdocuments by default. So all you see is just the _id. You can use the populate method to see all subdocuments in detail. ( https://mongoosejs.com/docs/populate.html ) .
Example :
Competition.
find({}).
populate('participant').
exec(function (err, comps) {
//
});
You can either use populate on the Model or on the Document. For populating a document, take a look at https://mongoosejs.com/docs/api.html#document_Document-populate . There is also a auto-populate plugin available via npm but in most cases it's not necessary : https://www.npmjs.com/package/mongoose-autopopulate .
Related
I've got a MongoDB database collection called Dealers structured a bit like this:
{
... dealer info goes here like address etc,
"user_logins": [
{
"Username": "something",
... other stuff
}
]
},{
... next dealer etc...
I'm using Mongoose to try and query on the user_logins.Username using this:
Mongoose model
const myTest = mongoose.Schema({
Username: {
type: "String",
required: true
}
}, { collection: "Dealers" })
module.exports = mongoose.model("Dealer", myTest);
The query
Dealer.find({'user_logins.Username' : 'something'}, (err, result) => {
if (err) {
console.log(err);
} else {
res.json(result);
}
});
All the Username's are distinct. But instead of returning the one matching document, it seems to be returning the whole Dealers collection.
I followed this example.
https://kb.objectrocket.com/mongo-db/use-mongoose-to-find-in-an-array-of-objects-1206
What am I doing wrong please?
Thanks.
EDIT: It seems fine if I try to find something on the root level. EG. Company name, address etc. But if I try to query an imbedded array of objects, that's when it pulls the whole collection. I don't get it.
Found the answer.
My model was wrong. It needed to reflect the actual structure of my data, which does kind of make sense.
This worked:
const myTest = mongoose.Schema({
user_logins: [{
Username: {
type: "String",
required: true
}
}]
}, { collection: "Dealers" })
module.exports = mongoose.model("Dealer", myTest);
i have a mongo collection that looks like this:
{
name: string
_id: (auto set)
items: array[
name: string
url: string
items: array[
{
name: string,
url: string,
items: []
}
]
]
}
I'm using findByIdAndUpdate (with mongoose) to add an item into the items array:
Menu.findByIdAndUpdate(
req.body.parentid,
{
$push: {
items: {
name: req.body.item.name,
url: req.body.item.url,
items: []
}
}
},
{
safe: true,
upsert: true,
new: true
},
function(err, model) {
if (err !== null) {
console.log(err);
}
}
);
This works fine, but it does not add an _id to each object inserted into the items array. And i really need an id for each one.
I'm guessing it comes from the method used, findByIdAndUpdate as it looks more like an update rather than an insert. If my thinking is correct.
Using mongodb 3.2.10 and mongoose 4.7.6.
Any help would be really appreciated.
Thanks.
EDIT: the _id: (auto set) is not real, it's being automatically added via mongo. But just at the top level objects.
Found the solution in this thread: mongoDB : Creating An ObjectId For Each New Child Added To The Array Field
basically, added
var ObjectID = require('mongodb').ObjectID;
and then forcing the creation:
$push: {
items: {
_id: new ObjectID(),
name: req.body.item.name,
url: req.body.item.url,
items: []
}
}
You dont need to sepcify _id: (auto set) in mongoose schema it will automatically add unique _id with each document.
if you don't define _id in Schema, mongoose automatically add a _id to array item.
for example:
const countrySchema = new Schema({
name: {
type: String
},
cities: [
{
// don't define _id here.
name: String
}
],
});
now when you insert a row, the result is something like this:
{name : 'Iran', cities : [{_id : 6202902b45f0d858ac141537,name :
'Tabriz'}]}
I am using mongoose 4.6.3.
I have the following schema :
var mongoose = require('mongoose');
var User = require('./User');
var TicketSchema = new mongoose.Schema({
user : { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true },
},
{
timestamps: true
});
var DrawSchema = new mongoose.Schema({
...
max_ticket_per_user : { type : Number, required: true },
tickets: [TicketSchema]
});
module.exports = mongoose.model('Draw', DrawSchema);
How can I count the embedded documents of a certain User ObjectId(user field in TicketSchema) in a Draw's tickets(tickets field in DrawSchema) ?
I want to count the tickets of a user for a single draw.
Would it be better to change my schema design ?
Thanks
You can use the aggregation framework taking advantage of the $filter and $size operators to get the filtered array with elements that match the user id and its size respectively which will subsequently give you the count.
For an single draw, consider adding a $match pipeline operator as your initial step with the _id query to filter the documents in the collection.
Consider running the following aggregation pipeline to get the desired result:
Draw.aggregate([
{ "$match": { "_id": drawId } },
{
"$project": {
"ticketsCount": {
"$size": {
"$filter": {
"input": "$tickets",
"as": "item",
"cond": { "$eq": [ "$$item.user", userId ] }
}
}
}
}
}
]).exec(function(err, result) {
console.log(result);
});
You can pass the .count() deep parameters like any other query object:
Draw.count({'tickets.user._id' : userId}, console.log);
Make sure the userId variable is an ObjectId. If it's a string, do this:
const ObjectId = require('mongoose').Types.ObjectId;
let userId = new ObjectId(incomingStringId);
Schema of group and member are as below:
var group=new Schema({
group_id:Number,
group_name:String,
members:[member]
});
var member=new Schema({
member_id:number,
name:String,
});
Sample document after inserting some record in group collection
[{
_id:55ff7fca8d3f6607114dc57d
group_id:1001,
group_name:"tango mike",
members:[
{
_id:44ff7fca8d3f6607114dc21c
member_id:2001,
member_name:"Bob martin" ,
address:String,
sex:String
},
{
_id:22ff7fca8d3f6607114dc22d
member_id:2002,
member_name:"Marry",
address:String,
sex:String
},
{
_id:44ff7fca8d3f6607114dc23e
member_id:2003,
member_name:"Alice" ,
address:String,
sex:String
}
]
}]
My problem:
I am trying to update record of individual group member(element of subdocument members). While updating I have follwing data group: _id, group_id, members:_id and newdata. I am trying like this; but it is not working
var newData={
member_name:"Alice goda" ,
address:"xyz",
sex:"F"
}
groupModel.findOne({"_id":"55fdbaa7457aa1b9bd7f7cf7","group_id":1001},'members -_id',function(err,groupMembers){
if(err)
{
res.json({
"isError":true,
"error":{
"status":1042,
"message":err
}
});
}
else
{
var mem=groupMembers.id("44ff7fca8d3f6607114dc23e");
mem.member_name=newData.member_name;
mem.address=newData.address;
mem.sex=newData.sex;
mem.save(function(err,data){
if(!err)
//sucessfull updated
});
res.json(groupDetails);
}
});
As I understand from your question details, you would like to update one object from the members array, in accordance with the criteria that you specify.
Thus, in order to accurately run the update query for your use case, you could run the following update operation against your collection:
db.collection.update({ _id: "55ff7fca8d3f6607114dc57d",
group_id:1001,
members: {
$elemMatch: { _id: "44ff7fca8d3f6607114dc23e" }
}
},
{ $set: {
"members.$.member_name": "Alice goda",
"members.$.address": "xyz",
"members.$.sex": "F"
}});
Still, be aware that the $ positional operator only updates the first array item that matches your query.
Unfortunately, there is no possibility of updating all the array elements that match your criteria in a single operation. As you can see on MongoDB Jira, the aforementioned feature is one of the most requested functionality, but it has not yet been directly implemented in MongoDB.
I have the following schema
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var ShopSchema = new Schema({
name: Schema.Types.Mixed,
country: {
type: String,
default: ''
},
createdAt: {
type: Date,
default: Date.now
},
defaultLanguage: {
type: String
},
account: {type : Schema.ObjectId, ref : 'Account'},
});
mongoose.model('Shop', ShopSchema);
"name" field is multilingual. I mean, I will keep the multilingual data like
name: {
"en": "My Shop",
"es": "Mi Tienda"
}
My problem is, in a controller, I am using this code to update the shop:
var mongoose = require('mongoose')
var Shop = mongoose.model('Shop')
exports.update = function(req, res) {
Shop.findByIdAndUpdate(req.params.shopid, {
$set: {
name: req.body.name
}
}, function(err, shop) {
if (err) return res.json(err);
res.json(shop);
});
};
and it is obvious that new data overrides the old data. What I need is to extend the old data with the new one.
Is there any method to do that?
You should to use the method .markModified(). See the doc http://mongoosejs.com/docs/schematypes.html#mixed
Since it is a schema-less type, you can change the value to anything else you like, but Mongoose loses the ability to auto detect and save those changes. To "tell" Mongoose that the value of a Mixed type has changed, call the .markModified(path) method of the document passing the path to the Mixed type you just changed.
person.anything = { x: [3, 4, { y: "changed" }] };
person.markModified('anything');
person.save(); // anything will now get saved
Use "dot notation" for the specific element:
Shop.findByIdAndUpdate(req.params.shopid, {
"$set": {
"name.en": req.body.name
}
}, function(err, shop) {
if (err) return res.json(err);
res.json(shop);
});
});
That wil either only overwrite the "en" element if that is what you want to do or "create" a new element with the data you set it to. So if you used "de" and that did not exist there will be the other elements and a new "de" one with the value.