MVC “create view” when there is one to many relationship in model

Question

My model is simple, one client can have many phone numbers :

I have represented this in Entity Framework

Answer 1

You have to do a few things:

First create a ViewModel that has the properties you need:

public class ClientViewModel
{
   public int Id {get;set;}
   public string Name {get;set;}
   public PhoneNumber PhoneNumber1 {get;set;}
   public PhoneNumber PhoneNumber2 {get;set;}
}

Change Create to return the ClientViewModel

[HttpGet]
public ActionResult Create()
{
   return View(new ClientViewModel());
}

Map the HttpPost to use the ClientViewModel and map the values to it:

[HttpPost]
public ActionResult Create(ClientViewModel clientViewModel)
{
   var client = new Client();
   client.Name = clientViewModel.Name;
   client.PhoneNumbers.Add(clientViewModel.PhoneNumber1);
   client.PhoneNumbers.Add(clientViewModel.PhoneNumber2);
   db.Clients.Add(client);
   db.SaveChanges();
   return RedirectToAction("Index", "Client");
}

Then, finally, modify your view:

<fieldset>
   <legend>Client</legend>

   <div class="editor-label">
      @Html.LabelFor(model => model.Name)
   </div>
   <div class="editor-field">
      @Html.EditorFor(model => model.Name)
      @Html.ValidationMessageFor(model => model.Name)
   </div>

   <div class="editor-label">
      @Html.LabelFor(model => model.PhoneNumber1.Number)
   </div>
   <div class="editor-field">
      @Html.EditorFor(model => model.PhoneNumber1.Number)
      @Html.ValidationMessageFor(model => model.PhoneNumber1.Number)
   </div>

   <div class="editor-label">
      @Html.LabelFor(model => model.PhoneNumber2.Number)
   </div>
   <div class="editor-field">
      @Html.EditorFor(model => model.PhoneNumber2.Number)
      @Html.ValidationMessageFor(model => model.PhoneNumber2.Number)
   </div>

   <p>
      <input type="submit" value="Create" />
   </p>
</fieldset>

Answer 2

For the collection you can use something like this:

@for(int i = 0; i < Model.PhoneNumbers.Count; i++)
{
   <div class="editor-field">
        @Html.EditorFor(model => model.PhoneNumbers[i])
        @Html.ValidationMessageFor(model => model.PhoneNumbers[i])
    </div>
}