Adding a record to the database based on input passed from a link on another form MVC 4 - asp.net-mvc-4

Question

I have been using ASP.NET MVC 4 for a while but I have not yet come across a situation where i need to insert a value into the database from a scaffolded Create view which is based on a value passed from another view. I have tried to infer from the Edit view to try and modify my code to work but I have run into a snag. I got an error similar to this post. Here is my code from the view passing the value
#Html.ActionLink("Allocate", "Create", "Allocation", new { id=item.requestID}, null)
this is from the list of requests already in the database from the Index view
here is my code on the controller that is trying to force the Create method to use the ID passed from the link above
public ActionResult Create(int id = 0)
{
Request request = db.Requests.Find(id);
ViewBag.requestID = new SelectList(db.Requests, "requestID", "requestID", request.requestID);
return View(request);
}
then here is the posting code to the db
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(Allocation allocation)
{
if (ModelState.IsValid)
{
db.Allocations.Add(allocation);
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.requestID = new SelectList(db.Requests, "requestID", "requestID", allocation.requestID);
return View(allocation);
}
Basically what I am trying to do is allocate funds to a request made where by the allocation is entered into the db based on the request id. I am trying to prevent the user from choosing the request id from a drop down list. When I run this i get an error
The model item passed into the dictionary is of type 'System.Data.Entity.DynamicProxies.Request_A52006F7570E0448EE323CB36858E4D13EED0BAD958340B32FF166708545DA8C', but this dictionary requires a model item of type 'BudgetAllocation.Models.Allocation'.
If theres anyone out there who can help me out with this please do as soon as you can. I appreciate all the effort offred!!!!!
//EDIT
Here is my Create view
#model BudgetAllocation.Models.Allocation
#{
ViewBag.Title = "Create";
}
<h2>Create</h2>
#using (Html.BeginForm()) {
#Html.AntiForgeryToken()
#Html.ValidationSummary(true)
<fieldset>
<legend>Allocation</legend>
#Html.HiddenFor(model => model.requestID)
<div class="editor-label">
#Html.LabelFor(model => model.allocAmount, "Amount")
</div>
<div class="editor-field">
#Html.EditorFor(model => model.allocAmount)
#Html.ValidationMessageFor(model => model.allocAmount)
</div>
<p>
<input type="submit" value="Allocate" />
</p>
</fieldset>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}

Answer 1

The problem is your view id strongly typed with BudgetAllocation.Models.Allocation while in get action of Create you are passing object of type BudgetAllocation.Models.Request thats why you are getting the exception.
You have to pass object of type BudgetAllocation.Models.Allocation in Create get action as well because you view is strongly typed to it.
public ActionResult Create(int id = 0)
{
Request request = db.Requests.Find(id);
return View(request) // <-------------- here is the mistake
}
it should return allocation object, something like this, it is just an example may be you need to do some other thing instead of selecting:
public ActionResult Create(int id = 0)
{
Allocation allocation = db.Allocations.Find(x=>x.requestID == id);
ViewBag.requestID = new SelectList(db.Requests, "requestID", "requestID", request.requestID);
return View(allocation);
}
UPDATE:
you simply need to do like this not return allocaiton object return simply View:
public ActionResult Create(int id = 0)
{
ViewBag.requestID = new SelectList(db.Requests, "requestID", "requestID", request.requestID);
return View();
}