使用父模型值的子模型验证.流利的验证. MVC4 [英] Child Model Validation using Parent Model Values. Fluent Validation. MVC4

问题描述

下面是我的问题的简化版本.

Below is a simplified version of my problem.

我无法展平模型.有一个我需要确认生日的孩子"列表.

I can not flatten the model. There is a List of "children" that I need to validate a birthday.

我似乎无法在Parent类中引用日期，并且想知道如何在Fluent Validation中完成该操作?

I can not seem to reference the date in the Parent class and was wondering how this is done in Fluent Validation?

型号

[Validator(typeof(ParentValidator))]
public class Parent
{
    public string Name { get; set; }
    public DateTime Birthdate { get; set; }

    public List<Child> Children { get; set; }
}

public class Child
{
    public string ChildProperty{ get; set; }
    public DateTime Birthdate { get; set; }
}

验证者

public class ParentValidator : AbstractValidator<Parent>
{
    public ParentValidator()
    {
         RuleFor(model => model.Name).NotEmpty();
         RuleForEach(model => model.Children).SetValidator(new ChildValidator());
    }
}

public class ChildValidator : AbstractValidator<Child>
{
    public ChildValidator()
    {
        RuleFor(model => model.ChildProperty).NotEmpty();
        //Compare birthday to make sure date is < Parents birthday
    }
}

推荐答案

创建这样的自定义属性验证器

Create a custom property validator like this

public class AllChildBirtdaysMustBeLaterThanParent : PropertyValidator
{
    public AllChildBirtdaysMustBeLaterThanParent()
        : base("Property {PropertyName} contains children born before their parent!")
    {
    }

    protected override bool IsValid(PropertyValidatorContext context)
    {
        var parent = context.ParentContext.InstanceToValidate as Parent;
        var list = context.PropertyValue as IList<Child>;

        if (list != null)
        {
            return ! (list.Any(c => parent.BirthDay > c.BirthDay));
        }

        return true;
    }
}

添加这样的规则

public class ParentValidator : AbstractValidator<Parent>
{
    public ParentValidator()
    {
        RuleFor(model => model.Name).NotEmpty();
        RuleFor(model => model.Children)
               .SetValidator(new AllChildBirtdaysMustBeLaterThanParent());

        // Collection validator
        RuleFor(model => model.Children).SetCollectionValidator(new ChildValidator());
    }
}

自定义属性"验证器的替代方法是使用自定义"方法:

Alternative to the Custom Property validator is to use the Custom method:

    public ParentValidator()
    {
        RuleFor(model => model.Name).NotEmpty();
        RuleFor(model => model.Children).SetCollectionValidator(new ChildValidator());

        Custom(parent =>
        {
            if (parent.Children == null)
                return null;

            return parent.Children.Any(c => parent.BirthDay > c.BirthDay)
               ? new ValidationFailure("Children", "Child cannot be older than parent.")
               : null;
        });
    }

显示失败指标的粗略方法:(应该是其他标识符的名称)

Crude way of showing indicies that failed: (should probably be name of some other identifier)

public class ParentValidator : AbstractValidator<Parent>
{
    public ParentValidator()
    {
        RuleFor(m => m.Children).SetCollectionValidator(new ChildValidator());

        Custom(parent =>
        {
            if (parent.Children == null)
                return null;

            var failIdx = parent.Children.Where(c => parent.BirthDay > c.BirthDay).Select(c => parent.Children.IndexOf(c));
            var failList = string.Join(",", failIdx);

            return failIdx.Count() > 0
               ? new ValidationFailure("Children", "Child cannot be older than parent. Fail on indicies " + failList)
               : null;
        });
    }

}

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