How create single create action for multiple models with TPH approach - asp.net-mvc

Question

I have base class Contract
public abstract class Contract
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int ContractID { get; set; }
[DataType(DataType.Date)]
[Required]
public DateTime StartDate { get; set; }
[DataType(DataType.Date)]
[Required]
public DateTime EndDate { get; set; }
}
And two other classes derive from this class: CreditContract and PrepaymentContract.
public class CreditContract : Contract
{
[Required]
public float CreditLimit { get; set; }
[Column(TypeName = "char")]
[StringLength(3)]
[Required]
public string CreditLimitCurrency { get; set; }
}
public class PrepaymentContract : Contract
{
[Required]
public float PrepaymentAmount { get; set; }
[Column(TypeName = "char")]
[StringLength(1)]
[Required]
public string PrepaymentPeriod { get; set; }
}
Additionally I've created ContractViewModel class.
public int SelectedContract { get; set; }
public CreditContract creditContract { get; set; }
public PrepaymentContract prepaymentContract { get; set; }
My Create method looks like this:
public ActionResult Create(ContractViewModel contract)
{
if (contract.SelectedCategory == 1)
{
if (ModelState.IsValid)
{
contract.creditContract.StartDate = contract.StartDate;
contract.creditContract.EndDate = contract.EndDate;
db.Contracts.Add(contract.creditContract);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(contract.creditContract);
}
else
{
if (ModelState.IsValid)
{
contract.prepaymentContract.StartDate = contract.StartDate;
contract.prepaymentContract.EndDate = contract.EndDate;
db.Contracts.Add(contract.prepaymentContract);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(contract.prepaymentContract);
}
}
And my Create view looks like this:
#model CodeFirstInheritance.ViewModels.ContractViewModel
<div class="form-horizontal">
<h4>Course</h4>
<hr />
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
<div class="form-group">
#Html.LabelFor(model => model.creditContract.StartDate, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.creditContract.StartDate, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.creditContract.StartDate, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.creditContract.EndDate, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.creditContract.EndDate, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.creditContract.EndDate, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.SelectedCategory, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.SelectedCategory, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.SelectedCategory, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.creditContract.CreditLimit, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.creditContract.CreditLimit, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.creditContract.CreditLimit, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.creditContract.CreditLimitCurrency, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.creditContract.CreditLimitCurrency, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.creditContract.CreditLimitCurrency, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
Can I do something like that:
E.g:
var selectedContract = contract.SelectedCategory.Enum;
if (ModelState.IsValid)
{
selectedContractt.StartDate = contract.StartDate;
selectedContract.EndDate = contract.EndDate;
db.Contracts.Add(contract.creditContract);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(selectedContract);