How to save particular object in mongoose schema

Question

I am facing some issue here i am try to store only one object either school or college or work, but mongoose automatically create other two object.

how to omit other object. here i should use default

let mySchema = new Schema({
    "type": { type: String, default: "" },  // school or college or work
    "school": {
        'name':{ type: String, default: "" },
        'parent':{ type: String, default: "" },
        'address':{ type: String, default: "" },
        'email_id':{ type: String, default: "" },
        'phone_no':{ type: String, default: "" },
    },
    "college": {
        'name':{ type: String, default: "" },
        'friend':{ type: String, default: "" },
        'address':{ type: String, default: "" },
        'email_id':{ type: String, default: "" },
        'phone_no':{ type: String, default: "" },
    },
    "work": {
        'name':{ type: String, default: "" },
        'colleague':{ type: String, default: "" },
        'address':{ type: String, default: "" },
        'email_id':{ type: String, default: "" },
        'phone_no':{ type: String, default: "" },
    },
});

Answer 1

If you check this section from Mongoose docs, you will see that Mongoose always creates an empty object for nested documents (e.g. school in your case).

You could use a subdocument instead, where school, college and work are instances of Schema.

What you can do:

const mySchema = new Schema({
  school: new Schema({
    name: { type: String },
    parent: { type: String },
    address: { type: String },
    email_id: { type: String },
    phone_no: { type: String },
  }),
  college: new Schema({
    name: { type: String },
    friend: { type: String },
    address: { type: String },
    email_id: { type: String },
    phone_no: { type: String },
  }),
  work: new Schema({
    name: { type: String },
    colleague: { type: String },
    address: { type: String },
    email_id: { type: String },
    phone_no: { type: String },
  }),
});
const MyModel = mongoose.model('MyModel', mySchema);
const myDocument = new MyModel();
myDocument.college = { name: 'Harvard' };
await myDocument.save();