java - 如何为同一个属性节点添加多个约束违规？

Question

我有一个自定义ConstraintValidator 。我想要做的是使用相同的消息和不同的动态负载为同一属性节点添加多个约束违规。这可能吗？

自定义注释:

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = CustomFieldConstraintValidator.class)
public @interface CustomFieldConstraint {
    String message() default "message";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};
}

自定义约束 validator :

public class CustomFieldConstraintValidator implements ConstraintValidator<CustomFieldConstraint, Integer> {
    @Override
    public boolean isValid(Integer value, ConstraintValidatorContext context) {
        var valid = true;
        var hibernateConstraintValidatorContext = context.unwrap(HibernateConstraintValidatorContext.class);
        hibernateConstraintValidatorContext.disableDefaultConstraintViolation();

        if (value > 0) {
            valid = false;

            hibernateConstraintValidatorContext.withDynamicPayload(Map.of("must_be_less_than", 0))
                .buildConstraintViolationWithTemplate(context.getDefaultConstraintMessageTemplate())
                .addPropertyNode("field")
                .addConstraintViolation();
        }

        if (value > 5) {
            valid = false;

            hibernateConstraintValidatorContext.withDynamicPayload(Map.of("must_be_less_than", 5))
                .buildConstraintViolationWithTemplate(context.getDefaultConstraintMessageTemplate())
                .addPropertyNode("field")
                .addConstraintViolation();
        }

        return valid;
    }
}

validator 测试:

public class HibernateValidatorTest {
    private final Validator validator = Validation.buildDefaultValidatorFactory().getValidator();

    @Test
    void multipleFailuresForSameField() {
        var foo = new Foo(10);

        var constraintViolations = validator.validate(foo);

        assertEquals(2, constraintViolations.size());
    }

    public static class Foo {
        @CustomFieldConstraint
        private int field;

        public Foo(int field) {
            this.field = field;
        }
    }
}

测试失败，并显示 expected: <2> but was: <1> .

Answer 1

您遇到此问题的原因是 ConstraintViolation 作为一组返回，并且根据设计，动态负载不包含在 equals() 方法中。请参阅https://github.com/hibernate/hibernate-validator/blob/master/engine/src/main/java/org/hibernate/validator/internal/engine/ConstraintViolationImpl.java#L251 .

因此，您的 2 个约束在集合级别被认为是相等的。

您需要改变做事的方式，并用这两种信息来丰富有效负载。