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copied!<p>In response to the current suggestions this is what I now have. </p> <p>Entities remain the same.</p> <p>The modified view model:</p> <pre><code>public class ParentViewModel { public string Message { get; set; } public string FirstThingCode { get; set; } public string FirstThingName { get; set; } public string SecondThingCode { get; set; } public string SecondThingName { get; set; } } </code></pre> <p>The modified view:</p> <pre><code>@using (@Html.BeginForm()) { <label>Code 1</label> @Html.EditorFor(model => model.FirstThingCode) <label>Name 1</label> @Html.EditorFor(model => model.FirstThingName) <label>Code 2</label> @Html.EditorFor(model => model.SecondThingCode) <label>Name 2</label> @Html.EditorFor(model => model.SecondThingName) <input type="submit" value="Save" /> } </code></pre> <p>The DTO:</p> <pre><code>public class ParentThingDTO { public ParentThingDTO(ParentViewModel model) { FirstThingCode = model.FirstThingCode; FirstThingName = model.FirstThingName; SecondThingCode = model.SecondThingCode; SecondThingName = model.SecondThingName; } public int Id { get; set; } public string FirstThingCode { get; set; } public string FirstThingName { get; set; } public string SecondThingCode { get; set; } public string SecondThingName { get; set; } public ParentThing GenerateEntity() { var thing = new ParentThing(); thing.TheFirstThing = new ChildThing { Code = FirstThingCode, Name = FirstThingName }; if (!string.IsNullOrWhiteSpace(SecondThingCode)) { thing.TheSecondThing = new ChildThing { Code = SecondThingCode, Name = SecondThingName }; } return thing; } } </code></pre> <p>The postback action in the controller:</p> <pre><code> [HttpPost] public ActionResult Create(ParentViewModel model) { try { var dto = new ParentThingDTO(model); var parentThing = dto.GenerateEntity(); using (var context = new QuantumContext()) { context.ParentThings.Add(parentThing); context.SaveChanges(); model.Message = "Saved"; } } catch (Exception ex) { model.Message = ex.Message; } return View(model); } </code></pre> <p>The null or whitespace test in the dto GenerateEntity method solves my initial problem of the MVC required property within the optional property. How does it look?</p>

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