问NestJS在拦截器中设置HttpStatus

EN

import { CallHandler, ExecutionContext, NestInterceptor, SetMetadata } from '@nestjs/common';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';
import { classToPlain } from 'class-transformer';
import { ApiResponse } from '../models/apiResponse';

export class TransformInterceptor implements NestInterceptor {
  intercept(
    context: ExecutionContext,
    next: CallHandler<ApiResponse | any>,
  ): Observable<ApiResponse | any> {
    return next.handle().pipe(
      map(data => {
        const http = context.switchToHttp();
        const res = http.getResponse();

        if(data instanceof ApiResponse) {
          if(data.status !== undefined) {
            res.status(data.status);
          }
        }

        return classToPlain(data);
      }),
    );
  }
}