CODEWITHSUNDEEP
c#entity-frameworkasp.net-mvc-4data-annotations
vaibhav shah
vaibhav shah

Reputation: 5069

How to use remote attribute in entity framework classes

In my application I am creating my EDMX file using Database First Method.

I get classes generated for all of tables there.

I am able to use annotations like Required,Display,StringLength,RegularExpression,etc. there.

I know in my model of MVC I can use annotation named "Remote" by which I can validate my entity property.

Is there any way to use this "Remote" attribute in entity classes ? or may some other way to create custom annotation?

Update: I have ViewModel Like this

    public Exam Exam { get; set; }
    public TestInfo Test { get; set; }

Both Exam & TestInfo are entity classes generated by entity framework.

There is property "ExamName" in entity class "Exam" which I want to validate for duplicate names.

Upvotes: 1

Views: 1143

Answers (1)

Shyju
Shyju

Reputation: 218832

Remote is a data annotation used to validate an input user enters in UI. It makes an ajax call to one of your action method (which you can specify) and expects a result value which tells whether this data already exists in your system.

You probably need to create a new view model for your view, instead of using the entity class created by entity framework, for your view. then you can have Remote attribute on that. In your action method ,you may deal with the actual entities to check the existence of the data.

public class RegisterVM
{
    [Required]  
    [Remote("IsAvailable", "Validation")]      
    public override string UserName { get; set; }
}

Now you may have your IsAvailable action method to check the UserName exists or not. Also make sure now your Register viw is strongly typed to this new RegisterVM viewmodel.

@model RegisterVM
@using(Html.Beginform())
{
  // your form controls

}

It does not makes sense to have Remote attribute on an Entity class. It should be on a view model.Otherwise you are mixing things up!

Upvotes: 1

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