Question

Lets say I have a partial view that contains both a checkbox and a numerical value.
I have a ViewModel that contains a Model — Terms — that implements the partial view. When I submit it, the modifications made in the Terms Partial View does not reflect to the Terms property of ViewModel. I’m probably misunderstanding a concept or another on how it works, anyone care to point it out please?

View

@model ViewModel
@using (Html.BeginForm("ViewAction", "ViewController", FormMethod.Post))
{
 // Other ViewModel Property Editors

 @Html.Partial("Terms", Model.Terms)
 <input type="submit" value="Submit" />
}

Partial View

@model Terms

@Html.CheckBoxFor(m => m.IsAccepted)
@Html.EditorFor(m => m.NumericalValue)

Controller

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult ViewAction(int id)
{
 ViewModel vm = GetVmValues();
 return View(vm);
}

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult ViewAction(ViewModel vm)
{
 // Access ViewModel properties
}

Answer 1

The default model binder expects the control ids for your Terms model to be named Terms.IsAccepted and Terms.NumericalValue. You need to create an editor template for your Terms model and then call @Html.EditorFor(m=> m.Terms) instead of using a partial.

You can read more about editor templates here. Its from MVC 2, but should still be relevant.