So I have a Customers model which needs to have a one to zero-or-one relationship with AspNetUsers. The way I want this to work is for a user to register. Then, if they want to, go to example.com/Customers/Create and create a single Customers record which they can edit or delete. A user can only have one or zero Customer records.
They problem is that when a user has created a Customer, the Customer view gives the user the option to create another customer and if he does, an error occurs.
How do I prevent this? Users should automatically not be given the option to create a Customer if they've created one already like here :
I also have to prevent this server side.
Model:
public class Customer
{
public int CustomerID { get; set; }
public virtual ApplicationUser ApplicationUser { get; set; }
public string Name { get; set; }
}
OnModelCreating:
modelBuilder.Entity<ApplicationUser>()
.HasOptional(m => m.Customer)
.WithRequired(m => m.ApplicationUser)
.Map(p => p.MapKey("UserId"))
Create method on controller (POST)
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "CustomerID,Name")] Customer customer)
{
if (ModelState.IsValid)
{
UserManager<ApplicationUser> UserManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(db));
var CurrentUser = UserManager.FindById(User.Identity.GetUserId());
customer.ApplicationUser = CurrentUser;
db.Customers.Add(customer);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(customer);
}
What should I change in my Index view so that isn't a 'Create new' option when a user has created a Customer, and in the Create view, stop anyone from creating anymore.
Index:
@model IEnumerable<WebApplication8.Models.Customer>
@{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<p>
@Html.ActionLink("Create New", "Create")
</p>
<table class="table">
<tr>
<th>
@Html.DisplayNameFor(model => model.Name)
</th>
<th></th>
</tr>
@foreach (var item in Model) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.Name)
</td>
<td>
@Html.ActionLink("Edit", "Edit", new { id=item.CustomerID }) |
@Html.ActionLink("Details", "Details", new { id=item.CustomerID }) |
@Html.ActionLink("Delete", "Delete", new { id=item.CustomerID })
</td>
</tr>
}
</table>
Create view:
@model WebApplication8.Models.Customer
@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Customer</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Name, "", 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>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}
