How to get request in class-validator constraint in nestjs

Question

If I want to validate the role which user post to api to create if is unique of relation enterprise

@Injectable({ scope: Scope.REQUEST })
@ValidatorConstraint({ name: 'Ddd', async: true })
export class IsUnqiueForEnterpriseConstraint implements ValidatorConstraintInterface {
    constructor(@Inject(REQUEST) private request: Request) {}

    async validate(value: any, args: ValidationArguments) {
        const { enterprise } = this.request.user as any
        const { model } = args.constraints[0] as IParams;
        if(!enterprise) return false;
        if (!model) return false;
        const repo = getManager().getRepository(model as ObjectType<any>);
        const item = await repo.findOne({
            [args.property]: value,
            enterprise: { id: enterprise.id },
        });
        return !item;
    }

    defaultMessage(args: ValidationArguments) {
        const { model } = args.constraints[0];
        if (!model) {
            return 'Model not been specified!';
        }
        return `${args.property} of ${model.name} must been unique!`;
    }
}
export function IsUnqiueForEnterprise(params: IParams, validationOptions?: ValidationOptions) {
    return (object: Record<string, any>, propertyName: string) => {
        registerDecorator({
            target: object.constructor,
            propertyName,
            options: validationOptions,
            constraints: [params],
            validator: IsUnqiueForEnterpriseConstraint,
        });
    };
}

And in main.ts I will container class-validator like follow

useContainer(app, { fallbackOnErrors: true });

and dto

@IsUnqiueForEnterprise({model: Role})
label!: string;

But in constraint request is undefined,how can I get it?