MODELSTATE.ISVALID CONTAINS ERRORS WHEN USING MONGODB

Simons Hood

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Points:494
Posted by  Simons Hood
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I'm trying to create a basic movie database using ASP.NET MVC 4 and MongoDB. My problem is in the POST Update method of my MovieController.

                                                                                                                               

[HttpPost]

    public ActionResult Update(Movie movie)

    {

        if (ModelState.IsValid)

        {

            _movies.Edit(movie);

            return RedirectToAction("Index");

        }

        return View();

    }

The ModelState contains an error for the movie's Id field (which is an ObjectId object) and throws the following exception:

 {System.InvalidOperationException: The parameter conversion from type 'System.String' to type 'MongoDB.Bson.ObjectId' failed because no type converter can convert between these types

This is the Update view:

@model MVCMovie.Models.Movie

@{

    ViewBag.Title = "Update";

}

<h2>Update</h2>

@using (Html.BeginForm())

{

    @Html.HiddenFor(m => m.Id);

    @Html.EditorForModel()

    <p>

        <input type="submit" value="Update" />

    </p>

}

And the Movie class in Models:

namespace MVCMovie.Models

{

    public class Movie

    {

        [BsonId]

        public ObjectId Id { get; set; }

        public string Title { get; set; }

        public DateTime ReleaseDate { get; set; }

        public string Genre { get; set; }

        public decimal Price { get; set; }

        [ScaffoldColumn(false)]

        public DateTime TimeAdded { get; set; }

    }

}

I'm assuming that the problem is being caused in the view because it tries to send a string instead of an ObjectId object. But I cannot figure out how to fix this, any ideas?

  1. Pravesh Singh

    Post:412

    Points:2888
    Re: ModelState.IsValid contains errors when using MongoDB

    Hi Samuel,

    Have a look at this

    public class MovieModelBinder : IModelBinder

    {

        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)

        {

            var modelBinder = new DefaultModelBinder();

            var movie = modelBinder.BindModel(controllerContext, bindingContext) as Movie;

            var id = controllerContext.HttpContext.Request.Form["Id"];

            if (movie != null)

            {

                movie.Id = new ObjectId(id);

                return movie ;

            }

            return null;

        }

    }

    And change your Update method as so

    public ActionResult Update([ModelBinder(typeof(MovieModelBinder))] Movie movie)

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