Nest

[xiaotiandada]

class-validator

• class-validator 校验器的使用

ValidationPipe

https://docs.nestjs.com/techniques/validation#stripping-properties
http://static.kancloud.cn/juukee/nestjs/2675355
https://juejin.cn/post/7064595876680826910

transform

app.useGlobalPipes(
    new ValidationPipe({
      transform: true,
    }),
);

@Get(':id')
findOne(@Param('id') id: number) {
 console.log(typeof id === 'number'); // true
 return 'This action returns a user';
}

id 会自动从 string 转换成 number

whitelist

app.useGlobalPipes(
    new ValidationPipe({
      whitelist: true,
    }),
);

true 时，自动删除非白名单属性(在验证类中没有任何修饰符的属性)。

// Bad
// 所有参数都将被过滤
export class CreateCatDto {
  public name: string;

  public age: number;
  
  public breed: string;
}


// Good
import { IsNumber, IsString } from 'class-validator';

export class CreateCatDto {
  @IsString()
  public name: string;

  @IsNumber()
  public age: number;

  @IsString()
  public breed: string;
}

typeorm

    "typeorm": "^0.3.6",
    "typeorm": "0.2.45",

0.3.x 按照文档无法工作
0.2.x 按照文档正常工作

• typeorm删除之remove与delete