How to handle lots of derived model with only one controller

Question

I am using ASP.NET MVC and I have several model classes all derived from the parent object. I want to handle all of these models in one controller action since they are nearly identical with the exception of some data fields. I want to save them to a database. How can I achieve such a behavior?

Example:

    class ParentModel {...}
    class ChildModel1 : ParentModel {...}
    class ChildModel2 : ParentModel {...}
    class ChildModel3 : ParentModel {...}
    class ChildModel4 : ParentModel {...}

    public class ModelController : Controller
    {
        //But with this I want to handle all the child objects as well
        //And add them automatically to the database.
        public ActionResult Add(ParentModel model)
        {
            db.ParentModel.Add(model);
        }
    }

Answer 1

you should create a ViewModel Class such as :

public class viewmodel 
    {
        public ChildModel1 childModel1 { get; set; }
        public ChildModel2 childModel2 { get; set; }
        public ChildModel3 childModel3 { get; set; }
        public ChildModel4 childModel4 { get; set; }
    }

then create an object of view model:

viewmodel v = new viewmodel();

now you can add your child model to the view model:

v.childModel1 = yourchildmodel1;
v.childModel2 = yourchildmodel2;
v.childModel3 = yourchildmodel3;
v.childModel4 = yourchildmodel4;

now you can pass this model.