Transformer in Entity is ignored

[joerndigital]

Hi,

I'm trying to work with a transformer in one of my entities to map a uuid to a binary number.

@Entity('object')
export class ObjectEntity {

    @PrimaryColumn('binary', {
        primary: true,
        transformer: new UuidTransformer(),
    })
    @ApiProperty({
        description: 'The uuid of the object',
        type: 'string',
        format: 'uuid'
    })
    id: string
}

The controller

@ApiTags('Object')
@Crud({
    model: {
        type: ObjectEntity,
    },
    routes: {
        only: ['getManyBase', 'getOneBase', 'createOneBase'],
    },
    params: {
        object_id: {
            type: 'uuid',
            primary: true,
            field: 'id',
        }
    },
})
@Controller()
export class ObjectController {
    constructor(public service: ObjectService) {
    }
}

But in my controller the transformer function is not triggered by the getOneBase method. Only after I overwrite getOneBase with my own custom method the transformer runs.

    @Override('getOneBase')
    _getOneBase( @Param('object_id') id) {
        return this.service.findOne(id);
    }

Where Clause without overriding:

 WHERE (`ObjectEntity`.`id` = ?) -- PARAMETERS: ["3fa85f64-5717-7562-b3fc-2c963f66afa6"]

Where Clause with overriding:

WHERE `ObjectEntity`.`id` = ? LIMIT 1 -- PARAMETERS: [{"type":"Buffer","data":[63,168,95,100,87,23,117,98,179,252,44,150,63,102,175,166]}]

Do I miss something to get the transformer working without overriding?

Best regards

[imamik]

+ 1

[Diluka]

by default, nestjs doesn't transform plain to class.

you can implement your own pipe:

@Injectable()
export class ParserPipe implements PipeTransform {

  transform(value: any, metadata: ArgumentMetadata): any {
    if (metadata.type !== 'custom' && value && metadata.data && metadata.metatype) {
      return plainToClass(metadata.metatype, value);
    }
    return value;
  }
}

or you can config ValidationPipe to do so (only body)
https://docs.nestjs.com/techniques/validation#transform-payload-objects