typescript 使用类验证器和 nestjs 验证嵌套对象
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Validate nested objects using class validator and nestjs
提问by Leonardo Emilio Dominguez
I'm trying to validate nested objects using class-validator and NestJS. I've already tried following this threadby using the @Typedecorator from class-transform and didn't have any luck. This what I have:
我正在尝试使用类验证器和 NestJS 验证嵌套对象。我已经尝试过使用class-transform 中的装饰器来关注此线程@Type，但没有任何运气。这是我所拥有的：
DTO:
DTO：
class PositionDto {
@IsNumber()
cost: number;
@IsNumber()
quantity: number;
}
export class FreeAgentsCreateEventDto {
@IsNumber()
eventId: number;
@IsEnum(FinderGamesSkillLevel)
skillLevel: FinderGamesSkillLevel;
@ValidateNested({ each: true })
@Type(() => PositionDto)
positions: PositionDto[];
}
I'm also using built-in nestjs validation pipe, this is my bootstrap:
我也在使用内置的 nestjs 验证管道，这是我的引导程序：
async function bootstrap() {
const app = await NestFactory.create(ServerModule);
app.useGlobalPipes(new ValidationPipe());
await app.listen(config.PORT);
}
bootstrap();
It's working fine for others properties, the array of object is the only one not working.
它对其他属性工作正常，对象数组是唯一一个不工作的。
回答by Kim Kern
You are expecting positions: [1]to throw a 400 but instead it is accepted.
您希望positions: [1]抛出 400，但它被接受了。
According to this Github issue, this seems to be a bug in class-validator. If you pass in a primitive type (boolean, string, number,...) or an arrayinstead of an object, it will accept the input as valid although it shouldn't.
根据这个Github 问题，这似乎是类验证器中的一个错误。如果您传入原始类型 ( boolean, string, number,...) 或一个array而不是对象，它会接受输入为有效，尽管它不应该。
I don't see any standard workaround besides creating a custom validation decorator:
除了创建自定义验证装饰器之外，我没有看到任何标准的解决方法：
import { registerDecorator, ValidationOptions, ValidationArguments } from 'class-validator';
export function IsNonPrimitiveArray(validationOptions?: ValidationOptions) {
return (object: any, propertyName: string) => {
registerDecorator({
name: 'IsNonPrimitiveArray',
target: object.constructor,
propertyName,
constraints: [],
options: validationOptions,
validator: {
validate(value: any, args: ValidationArguments) {
return Array.isArray(value) && value.reduce((a, b) => a && typeof b === 'object' && !Array.isArray(b), true);
},
},
});
};
}
and then use it in your dto class:
然后在你的 dto 类中使用它：
@ValidateNested({ each: true })
@IsNonPrimitiveArray()
@Type(() => PositionDto)
positions: PositionDto[];
