我可以将数字变量与 'class-validator' 进行比较吗?
Can I compare number variables with 'class-validator'?
嗨!我有一个关于 class-validator
的问题
我的客户会要求多个号码,我需要相互比较数值。
我想要如下代码。
const validator: SomeValidator = new SomeValidator;
validator.first = 1000;
validator.second = 2000; // this will be greater than validator.first
validator.third = 3000; // this will be greater than validator.second
我尝试将变量输入到 @Min() 验证器中,如下所示
import { IsInt, Min } from 'class-validator';
class SomeValidator {
@IsInt()
@Min(0)
public first: number;
@IsInt()
@Min(this.first) // it occurs TS7017
public second: number;
@IsInt()
@Min(this.second) // it occurs TS7017
public third: number;
}
我遇到了 TS7017 错误。
TS7017: Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature.
有什么完美的方法可以解决这个问题吗?
我知道有如下简单的方法,但是我希望有一些方法可以使用 class-validator。
if ((first > second) || (second > third)) {
res.status(400).json({
message: 'validation failed',
});
return next(new Error('some error'));
是的,你可以,但不是原生的,在这种情况下你需要创建你自己的装饰器来实现这个验证。这是一个例子:
首先创建装饰器验证器
// file validators/is-bigger-than.ts
import { registerDecorator, ValidationOptions, ValidationArguments } from 'class-validator';
export function IsBiggerThan(property: string, validationOptions?: ValidationOptions) {
return function (object: Object, propertyName: string) {
registerDecorator({
name: 'isBiggerThan',
target: object.constructor,
propertyName: propertyName,
constraints: [property],
options: validationOptions,
validator: {
validate(value: any, args: ValidationArguments) {
const [relatedPropertyName] = args.constraints;
const relatedValue = (args.object as any)[relatedPropertyName];
return typeof value === 'number' && typeof relatedValue === 'number' && value > relatedValue;
},
},
});
};
}
然后在你的dto中导入它
import { IsBiggerThan } from '../../validators/is-bigger-than';
export class SomeObjectDTO {
minValue: number;
@IsBiggerThan('minValue', {
message: 'maxValue must be larger than minValue',
})
maxValue: number;
}
嗨!我有一个关于 class-validator
的问题我的客户会要求多个号码,我需要相互比较数值。
我想要如下代码。
const validator: SomeValidator = new SomeValidator;
validator.first = 1000;
validator.second = 2000; // this will be greater than validator.first
validator.third = 3000; // this will be greater than validator.second
我尝试将变量输入到 @Min() 验证器中,如下所示
import { IsInt, Min } from 'class-validator';
class SomeValidator {
@IsInt()
@Min(0)
public first: number;
@IsInt()
@Min(this.first) // it occurs TS7017
public second: number;
@IsInt()
@Min(this.second) // it occurs TS7017
public third: number;
}
我遇到了 TS7017 错误。
TS7017: Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature.
有什么完美的方法可以解决这个问题吗?
我知道有如下简单的方法,但是我希望有一些方法可以使用 class-validator。
if ((first > second) || (second > third)) {
res.status(400).json({
message: 'validation failed',
});
return next(new Error('some error'));
是的,你可以,但不是原生的,在这种情况下你需要创建你自己的装饰器来实现这个验证。这是一个例子:
首先创建装饰器验证器
// file validators/is-bigger-than.ts
import { registerDecorator, ValidationOptions, ValidationArguments } from 'class-validator';
export function IsBiggerThan(property: string, validationOptions?: ValidationOptions) {
return function (object: Object, propertyName: string) {
registerDecorator({
name: 'isBiggerThan',
target: object.constructor,
propertyName: propertyName,
constraints: [property],
options: validationOptions,
validator: {
validate(value: any, args: ValidationArguments) {
const [relatedPropertyName] = args.constraints;
const relatedValue = (args.object as any)[relatedPropertyName];
return typeof value === 'number' && typeof relatedValue === 'number' && value > relatedValue;
},
},
});
};
}
然后在你的dto中导入它
import { IsBiggerThan } from '../../validators/is-bigger-than';
export class SomeObjectDTO {
minValue: number;
@IsBiggerThan('minValue', {
message: 'maxValue must be larger than minValue',
})
maxValue: number;
}