How to save nested array of objects data using mongoose?

Question

So, I'm sending data from angular reactive form like: Angular reactive form UI image

and Data being sent to backend in browser console image

I have made schema for task as:

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

let taskSchema = new Schema({
    taskId:{
        type:String,
        unique:true
    },
    task:{
        type:String,
        default:''
    },
    subTask:[{ 
        type: Schema.Types.ObjectId, 
        ref: 'SubTask'
    }]
}
module.exports = mongoose.model('Task',taskSchema);

Schema for Sub-Task as:

let subTaskSchema = new  Schema({
    title:String,
    subSubTask:[{ 
        type: Schema.Types.ObjectId, 
        ref: 'SubSubTask'
    }]
})
module.exports = mongoose.model('SubTask',subTaskSchema);

Schema for Sub-Sub-Task as:

let subSubTaskSchema = new  Schema({
    title:String
})
module.exports = mongoose.model('SubSubTask',subSubTaskSchema);

Now,I'm confused about how to save nested array of objects data in mongodb using mongoose?

i think you made error in this line not sure of it but please check module.exports = mongoose.model('subTask',subTaskSchema); it should be module.exports = mongoose.model('SubTask',subTaskSchema); when you are using it to refer you using 'SubTask' — Vinil Prabhu
– Vinil Prabhu, Commented Feb 22, 2019 at 12:48
fixed this one, I'm having trouble in polpulating it, its giving me empty subTask array — Sanjay Yadav
– Sanjay Yadav, Commented Feb 22, 2019 at 12:51
github.com/sanjayadav/ToDoList/tree/master/app/controllers , open dashboardController and code is in createTask() -> taskCreationFunction() & subTaskCreationFunction() — Sanjay Yadav
– Sanjay Yadav, Commented Feb 22, 2019 at 13:31
Thanks for the help, actually the problem was in data which was sent by angular, I had to stringify data before sending and parsed it after receiving on backend, then proceeded with steps above and it worked. — Sanjay Yadav
– Sanjay Yadav, Commented Feb 24, 2019 at 7:32

Vinil Prabhu · Accepted Answer · 2019-02-22 04:04:22Z

1

you can define your schema like this

const userSchema = new mongoose.Schema({
    likedBooks: [{
        type: mongoose.Types.ObjectId,
        ref: 'books'
    }],
    email: {
        type: String,
        required: true
    },
    name: {
        type: String,
        required: true
    }
});

exports.User = mongoose.model('users', userSchema);

then you can populate data by doing

user = User.find({ email: req.body.email }).populate('likedBooks');

here likedBooks contains _id of each book

const bookSchema = new mongoose.Schema({
    isbn: {
        type: Number,
        required: true
    },
    name: {
        type: String,
        required: true
    },
    author: {
        type: String,
        required: true
    },
    publisher: {
        type: String,
        default: ""
    },
    imageUrl: {
        type: String,
        required: true
    },
    description: {
        type: String,
        default: ""
    }
});

exports.Book = mongoose.model('books', bookSchema);

for both schema i have not put _id as it is auto generated by mongodb and it is used as reference

edited Feb 22, 2019 at 4:04

answered Feb 21, 2019 at 4:56

Vinil Prabhu

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5 Comments

Sanjay Yadav Over a year ago

Hey, could you please share books schema as well?

Vinil Prabhu Over a year ago

@SanjayYadav i have eddited my answer please check

Sanjay Yadav Over a year ago

Thanks for sharing the schema, I've updated my schema, now there are 3 schema in total for my data, I've edited the question, please check if schema are correct.

Sanjay Yadav Over a year ago

Also, please help me in proceeding to next step, I'm stuck on this issue from last 2 days.

Vinil Prabhu Over a year ago

all the documents will have _id which will be auto generated by mongo db, store this _id of subTask in subtask array of task

Alagarasan M · Accepted Answer · 2019-02-20 17:09:39Z

0

The Object Model should look like this before saving.

{ taskId: 1, task: 'Do something', subTask: [{ title: 'Write a essay', subSubTask: [{ title: 'Collect details to write an essay' }] }] }

Hope it helps...

answered Feb 20, 2019 at 17:09

Alagarasan M

9078 silver badges16 bronze badges

5 Comments

Sanjay Yadav Over a year ago

Thanks for replying but actually it's not what I'm looking for.

Sanjay Yadav Over a year ago

I'm sending all the data from angular service through parameters, so I'm using req.body for eg. { task : req.body.task } but how do I do it for array of objects in my question above?

Alagarasan M Over a year ago

Are you facing problem in sending the values to server? Or is there any problem while you are trying to save the value using mongoose?

Sanjay Yadav Over a year ago

There's an error when I'm trying to save values using mongoose, How do I save nested array of objects using mongoose?

Alagarasan M Over a year ago

You don't need to do anything specific just a usual save. Can you provide your here? So we can analyse it quickly.

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