ApiReponse with type is an Advanced Types

Hi,

I have an generic class who is return on all my request

import { ApiModelProperty } from '@nestjs/swagger';

export class ServerApiResponse<T> {
  
  @ApiModelProperty()
  value: T;
  
  @ApiModelProperty({ type: Number })
  pages: number;


  @ApiModelProperty({ type: Number })
  page: number;

  @ApiModelProperty({ type: Number })
  maxByPage: number;


  @ApiModelProperty({ type: Number })
  count: number;

  @ApiModelProperty({ type: Object })
  error: any;
}

And on my endpoint i have add

@ApiResponse({
    status: 200,
    description: '',
    type: ServerApiResponse<PatientCaretrackPopulatedOutput[]>
  })

But i have this error Error TS2348: Value of type 'ServerApiResponse' is not callable.

So i tried this

@ApiResponse({
    status: 200,
    description: '',
    type:  new ServerApiResponse<PatientCaretrackPopulatedOutput[]>()
  })

But when i launch swagger i have no description of response returned.

It’s possible to do this ?

Thx

[alisherks]

It’s not possible for the same reason as Array<T> or T[] (look at the issue Microsoft/TypeScript/issues/10576). You could try the following:

export abstract class ServiceApiResponse<T> {
  abstract get value(): T;
  
  @ApiModelProperty({ type: Number })
  pages: number;


  @ApiModelProperty({ type: Number })
  page: number;

  @ApiModelProperty({ type: Number })
  maxByPage: number;


  @ApiModelProperty({ type: Number })
  count: number;

  @ApiModelProperty({ type: Object })
  error: any;
}

export class PatientCaretrackPopulatedOutputResponse extends ServiceApiResponse<PatientCaretrackPopulatedResponse[]> {
  @ApiModelProperty({ type: PatientCaretrackPopulatedResponse, isArray: true })
  value: PatientCaretrackPopulatedResponse[];
}

[omar]

Cross posting this, does that mean a generic controller wouldn’t be able to expose the proper endpoints? For example, something like this (taken from https://github.com/nestjs/nest/issues/228):

export abstract class EntityController<T> {
    constructor(protected readonly service: EntityService<T>) { }

    @Get()
    async findAll() {
        return this.service.findAll();
    }

    @Get(':id')
    async getById(@Param() params) {
        return this.service.getById(params.id);
    }

    @Post()
    async create(@Body() data: Partial<T>) {
        return this.service.create(data);
    }
}