use parent schema value as default value of child schema in mongoose

Question

const ParentSchema = new Schema({
    key1: {type: String, required: true},
    key2: {type: String, required: true},
    child: {type: [ChildSchema], default: ChildSchema}
})

const ChildSchema = new Schema({
    key3: {type: String, default: '**Value of Key1**'},
    key4: {type: String}
})

Here I have two schemas one is a parent schema and another one is child schema, I want to set Key1 value as a default value of Key3. Key1 value is a dynamic value that will be entered by the user.

Thanks in advance.

Answer 1

You can try using Mongoose population.

const ParentSchema = new Schema({
    key1: {type: String, required: true},
    key2: {type: String, required: true}
})

const ChildSchema = new Schema({
    key3: { type: Schema.Types.ObjectId, ref: 'ParentSchema' }
    key4: {type: String}
})

Then, you can populate ChildSchema like this:

ChildSchema.
  findById(someId).
  populate('key3', 'key1').
  exec(errorHandlingCb);

For detail implementation see here .