I have a data layer that reads and writes to a MongoDB instance. I only want to deal with MongoDB documents at that layer and not expose that implementation to my services.
Right now I am doing something like:
// users.repository.ts
...
async getUserById(id: string): Promise<UserDto> {
const user = await this.model.findOne({ _id: id }).exec();
return this.transformToDto(user);
}
private transformToDto(user: UserDocument): UserDto {
return {
id: user._id,
...etc
}
}
...
This seems overly verbose and there must be a simpler way to achieve this without adding a helper to every repository.
Is there a cleaner way to achieve this?
You can use class-transformer for that and you don't need to use extra helper methods it can be returned instantly.
import { plainToClass } from 'class-transformer';
class UserDto {
id: string;
email: string;
role: string;
}
class Service {
async getUserById(id: string): Promise<UserDto> {
const user = await this.model.findOne({ _id: id }).exec();
return plainToClass(UserDto, user);
}
}
It will return transformed value which is UserDto
UserDto { id: 'U-111', email: 'U-111@email', role: 'user' }