C# MVC validation using data annotations (database first)

Question

So I have an API that has a controller post action like this:

public HttpResponseMessage Post(Model m){
  if(!ModelState.IsValid){
    return ApiRequest.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
  }
}

And here is my model:

[MetadataType(typeof(Metadata))]
public partial class MyModel {

  private sealed class Metadata {

    [Required(ErrorMessage="Sample error msg.")]
    public string Field1 {get; set;}
    // ...other fields and foreign key fields here
  }

}

As I stated on my title, I am using database first which is why I created a partial class since my models are auto-generated.

The problem is when a validation error occurs the result JSON of error messages looks like this:

{
  e.Field1: "Error msg here...",
  e.Field2: "Error msg here...",
  e.DateField: "An error occurred" //This happens for any date type field even though i've specified an error message
  e: ["An error occurred", "An error occurred"] //This happens for the foreign key fields i.e. AnotherModelID, I got 2 which is why I think it has two error messages also
}

First what I want here is to remove the e prefix on the keys of the JSON result. Then why is the error An error occurred being returned even though I've put an error message explicitly? And also why does the foreign key fields doesn't display just the prefix e?

Thanks

UPDATE

Upon more research I think in the case where the error key is only the letter e instead of the e.FieldName happens when the data type of the field in question is int. I've tested a non-foreign key int field and it also adds to the error under the "e only" key.

You should use the different class like ViewModel instead of using Domain Class directly in your controller. — Saadi, Apr 12 '18 at 07:31
https://stackoverflow.com/questions/11064316/what-is-viewmodel-in-mvc — Saadi, Apr 15 '18 at 07:30

C# MVC validation using data annotations (database first)

0 Answers0