I have this DTO and when I try to convert it to an object it doesn't convert to the way I want. Value converted to object but field name remains the same.
export class CreatePageGroupsDto {
@IsString()
@Expose()
name: string;
@IsString()
@Expose()
url: string;
@IsEnum(CategoryEnum)
@Expose()
category: CategoryEnum;
@Expose({ name: 'page_view' })
@Transform(({
value = false,
}, ) => {
const pageView: PageView = { stand_alone: value };
return pageView;
} )
stand_alone?: boolean;
}
I have this DTO and want to convert it to an object like this
{
'name': 'string',
'url': 'string',
'category': 'legal',
'page_view': {
stand_alone: false,
},
}
If you have the dto instance, and you want to covert it to an object. Your code is right.
import { Expose, instanceToPlain, Transform } from 'class-transformer';
class CreatePageGroupsDto {
@Expose({ name: 'page_view' })
@Transform(({ value = false }) => {
const pageView = { stand_alone: value };
return pageView;
})
stand_alone?: boolean;
}
const dto = new CreatePageGroupsDto();
dto.stand_alone = false;
console.log(instanceToPlain(dto));
Output:
{ page_view: { stand_alone: false } }
So I think you actually have a plain object from http request. And your framework like Nestjs convert the request object to the dto instance. This process is plainToInstance, not instanceToPlain. You can try swapping page_view and stand_alone like the following code:
class CreatePageGroupsDto {
@Expose({ name: 'stand_alone' })
@Transform(({ value = false }) => {
const pageView = { stand_alone: value };
return pageView;
})
page_view?: boolean;
}