custom validation - Help & Support

Marcio Goularte 388 posts 1360 karma points

Jun 26, 2017 @ 12:56

Custom validation UI-O-Matic V2

------Umbraco version 7.6.3 assembly: 1.0.6361.21154---------

Hello guys. I'm using A UI-O-Matic V2 with a Repository implementation. I am developing a registration system and one of the rules of business is to check if there is already a registration for a student and course selected. Since V2 is by data annotations, I tried to use Remote Validation, but it does not work. For now I am generating an Exception, but it is not friendly, since it opens the dialog with Exception and stacktrace. Is there any way to do this type of validation? Some Code:

        public override uEnrollment Create(uEnrollment model)
    {
        if (model.ItemId > 0 && model.MemberId > 0)
        {
            if (_enrollmentservice.ExistsEnrollmentToMemberByItem(model.ItemId, model.MemberId))
            {
                throw new Exception("It is not possible to enroll. This student is already enrolled in this course");

            }
                var entity = _enrollmentservice.EnrollmentManual(model.MemberId, model.ItemId);
            model = Mapper.Map<uEnrollment>(entity);
        }
        return model;            
    }

//Property

 [Remote("ExistsEnrollmentToMemberByItem", "CursoSurface",
AdditionalFields = "MemberId,ItemId",
ErrorMessage = "It is not possible to enroll. This student is already enrolled in this course")]
    public bool Exists { get; set; }

//Surface Controller Action

[HttpPost]
        public JsonResult ExistsEnrollmentToMemberByItem(int ItemId, int MemberId)
        {

            if (!_enrollmentservice.ExistsEnrollmentToMemberByItem(ItemId, MemberId))
            {
                return Json("It is not possible to enroll. This student is already enrolled in this course", JsonRequestBehavior.AllowGet);
            }

            return Json(true, JsonRequestBehavior.AllowGet);
        }

I'm displaying the error like this: (Not friendly) enter image description here

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Comment author was deleted

Jun 26, 2017 @ 13:43

Hmm I'll check why remote val isn't working, must say I haven't tried it...

You could also rework your code into an actual validation attribute by creating a custom attribute... Does that make sense?

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Marcio Goularte 388 posts 1360 karma points

Jun 26, 2017 @ 14:01

Makes sense. I've even started to develop the attribute. I had thought about it, but I did not because I do not know how the validation is made. If Unobtrusive client side is used. I know it's got a call to an API: enter image description here

So I've already been on the Remote path.

I will report the result of the attribute development here.

UI-O-Matic is great! First time I'm using!

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Marcio Goularte 388 posts 1360 karma points

Jun 26, 2017 @ 17:34

Reporting. The custom attribute worked perfectly. Displays the message as desired.

public class ExistsEnrollmentAttribute : ValidationAttribute, IClientValidatable
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {

       //to do:I need to inject this.            
        var _enrollmentservice = new EnrollmentService();

        var model = (uEnrollment)validationContext.ObjectInstance;
        if (model.ItemId == 0)
        {
            return new ValidationResult("required");
        }
        if (model.MemberId == 0)
        {
            return new ValidationResult("required");
        }            

        if (_enrollmentservice.ExistsEnrollmentToMemberByItem(model.ItemId, model.MemberId))
        {
            return new ValidationResult("It is not possible to enroll. This student is already enrolled in this course");
        }

        return ValidationResult.Success;

    }

    public IEnumerable<ModelClientValidationRule> GetClientValidationRules(
       ModelMetadata metadata,
       ControllerContext context)
    {
        var modelClientValidationRule = new ModelClientValidationRule
        {
            ValidationType = "existsEnrollment",
            ErrorMessage = this.FormatErrorMessage(metadata.DisplayName)
        };

        return new List<ModelClientValidationRule> { modelClientValidationRule };
    }
}

    //model    
    [ExistsEnrollment]
    public bool Exists { get; set; }

enter image description here

Thanks a lot Tim.

I believe this path is better than using remote data annotations

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Custom validation UI-O-Matic V2