Nest JS - Serialization not work with nested object - serialization

Question

I want to append a new field called logo_img_url after data manipulation. It works with the object but the nested array object seems not to work. Any recommendations or solution
import { Expose } from 'class-transformer';
import {} from 'class-validator';
import { Entity, Column } from 'typeorm';
import { BaseEntity } from '#common/base/entity.base';
import { getAdminImageUrl } from '#common/util/vault-file.util';
#Entity()
export class Agency extends BaseEntity {
#Expose()
#Column({
type: 'varchar',
length: '255',
nullable: true,
})
public logo_key!: string;
#Expose({ name: 'logoImgUrl' })
logo_img_url = this.logoImgUrl;
#Expose()
get logoImgUrl(): any {
return "http://localhost:30001/". this.logo_key;
}
}
Actaul response:
{
"data": [
{
"logo_img_url": "",
"id": 22,
"logo_url": "9597e74d-aaea-4502-b5cd-b2867504fd80",
},
{
"logo_img_url": "",
"id": 21,
"logo_url": "0a655497-1318-4276-a21f-cfdc259241a2",
},
],
"meta": {
"status_code": 200,
"pagination": {
"totalPages": 1,
"currentPage": 1,
"nextPage": null,
"paginationToken": null,
"previousPage": null,
"totalItems": 9,
"itemsPerPage": 10
}
}
}
Expected result:
{
"data": [
{
"logo_img_url": "http://localhost:3000/9597e74d-aaea-4502-b5cd-b2867504fd80",
"id": 22,
"logo_url": "9597e74d-aaea-4502-b5cd-b2867504fd80",
},
{
"logo_img_url": "http://localhost:3000/0a655497-1318-4276-a21f-cfdc259241a2",
"id": 21,
"logo_url": "0a655497-1318-4276-a21f-cfdc259241a2",
},
],
"meta": {
"status_code": 200,
"pagination": {
"totalPages": 1,
"currentPage": 1,
"nextPage": null,
"paginationToken": null,
"previousPage": null,
"totalItems": 9,
"itemsPerPage": 10
}
}
}

Answer 1

You can use #AfterLoad decorator from typeorm. Its calls the decorated method once the entity is loaded and then one can perform the required manipulations.
logo_img_url:string
#AfterLoad()
async transform(){
this.logo_img_url=`http://localhost:30001/${this.logo_key}`
}