How to add to array in mongo db collection

Question

Good evening,

I have my model

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const widgetSchema = new Schema({
    city: {
        type: String
    }
})

const userSchema = new Schema({
    name: {
        type: String,
    },
    password: {
        type: String
    },
    widgets: [widgetSchema]
})


const User = mongoose.model('user', userSchema);

module.exports = User;

And my question is how can I add elements to the widget array? Should I use an update or what? I think, firstly I need to find user document:

app.post('/addwidget', async (req, res) => {
    const { city } = req.body;
    try {
        const user = await User.findOne({"name": "1"});
    }
    catch(err){
        console.log(err)
    }
})

and thank what? Is there method like push or something like that?

Abdelmlak Dhif · Accepted Answer · 2021-01-04 09:02:03Z

1

Try this one :

  try {
    const user = await Research.findOneAndUpdate({ name: '1' }, { $push: { widgets: { city: 'viking' }} })
    if (user) return user;
    else return false;
  } catch (error) {
     console.log(error);
  }

answered Jan 4, 2021 at 9:02

Abdelmlak Dhif

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Comments

Amir BenAmara · Accepted Answer · 2021-01-04 20:19:18Z

1

you can use $push or $addToSet to add new item to the widgets array :

app.post('/addwidget', async (req, res) => {
    const { city } = req.body; // 
    try {
        const user = await User.findOneAndUpdate({"name": "1"} , { $push: { widgets: city }});
    }
    catch(err){
        console.log(err)
    }
})

or :

app.post('/addwidget', async (req, res) => {
    const { city } = req.body;
    try {
        const user = await User.findOneAndUpdate({"name": "1"} , { $addToSet : {widgets: city }});
    }
    catch(err){
        console.log(err)
    }
})

answered Jan 4, 2021 at 20:19

Amir BenAmara

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Comments

Lin Du · Accepted Answer · 2021-01-04 07:25:10Z

0

From the doc: Adding Subdocs to Arrays, you can use MongooseArray.prototype.push()

E.g.

app.post('/addwidget', async (req, res) => {
  const { city } = req.body;
  try {
    const user = await User.findOne({ name: '1' });
    user.widgets.push({ city: 'viking' });
    await user.save();
  } catch (err) {
    console.log(err);
  }
});

answered Jan 4, 2021 at 7:25

Lin Du

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