ValidationPipe() 无法覆盖 Nestjs/Crud 中的 @Query

Question

我正在尝试验证 get 请求的查询中出现的参数，但由于某种原因，验证管道无法识别查询的元素。

import {
  Controller,
  Post,
  Query,
  Body,
  UseInterceptors,
  Param,
  Res,
  Logger,
} from '@nestjs/common';
import { Crud, CrudController, Override } from '@nestjsx/crud';

import { OpenScheduleDto } from './open-schedule.dto';
@Crud(Schedule)
export class ScheduleController
          implements CrudController<ScheduleService, Schedule> {
          constructor(public service: ScheduleService) {}

          get base(): CrudController<ScheduleService, Schedule> {
            return this;
          }

          @Override()
          async getMany(@Query() query: OpenScheduleDto) { 
             return query; 
         } 
    }

OpenSchedule.dto

import { IsNumber, IsOptional, IsString } from 'class-validator';
export class OpenScheduleDto {

  @IsNumber()
  companyId: number;

  @IsNumber()
  @IsOptional()
  professionalId: number;

  @IsString()
  @IsOptional()
  scheduleDate: string;
}

当我向http://localhost:3000/schedules?companyId=3&professionalId=1发出 get 请求时

我收到意外错误：

{
    "statusCode": 400,
    "error": "Bad Request",
    "message": [
        {
            "target": {
                "companyId": "3",
                "professionalId": "1"
            },
            "value": "3",
            "property": "companyId",
            "children": [],
            "constraints": {
                "isNumber": "companyId must be a number"
            }
        },
        {
            "target": {
                "companyId": "3",
                "professionalId": "1"
            },
            "value": "1",
            "property": "professionalId",
            "children": [],
            "constraints": {
                "isNumber": "professionalId must be a number"
            }
        }
    ]
}

Answer 1

那是因为当你使用@Query参数时，一切都是一个字符串。它没有数字或布尔值作为像 json 这样的数据类型。所以你必须先把你的值转换成一个数字。为此，您可以使用class-transformer's @Transform：

import { IsNumber, IsOptional, IsString } from 'class-validator';
import { Transform } from 'class-transformer';
export class OpenScheduleDto {

  @Transform(id => parseInt(id))
  @IsNumber()
  companyId: number;

  @Transform(id => id ? parseInt(id) : id)
  @IsNumber()
  @IsOptional()
  professionalId?: number;

  @IsString()
  @IsOptional()
  scheduleDate?: string;
}

但请注意，这是不安全的，因为例如parseInt('5abc010')是5. 因此，您可能希望在转换函数中进行额外检查。