So I have this demo project almost completely working.
public class Project
{
public int ID { get; set; }
[Required]
public string Name { get; set; }
public virtual ICollection<Task> Tasks { get; set; }
}
public class Task
{
public int ID { get; set; }
[Required]
public string Name { get; set; }
public int ProjectID { get; set; }
public virtual Project Project { get; set; }
}
Controller
public ActionResult Edit(int id)
{
var project = db.Projects.Where(p=>p.ID==id).Single();
return View(project);
}
[HttpPost]
public ActionResult Edit(Project project)
{
if (ModelState.IsValid)
{
var dbProject = db.Projects.Where(p => p.ID == project.ID).Single();
UpdateModel(dbProject);
db.SaveChanges();
TempData["Success"] = "Modelo Valido";
}
return RedirectToAction("Index");
}
View//strongly typed for project
@using (Html.BeginForm())
{
@Html.ValidationSummary(true)
<fieldset>
<legend>Project</legend>
@Html.HiddenFor(model => model.ID)
<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>
<h1>Tasks</h1>
@Html.EditorFor(m => m.Tasks)
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
}
EditorTemplate
@model MvcApplication2.Models.Task
<span>Task</span>
<br />
@Html.LabelFor(m => m.Name)
@Html.EditorFor(m => m.Name)
@Html.HiddenFor(m => m.ID)
@Html.HiddenFor(m => m.ProjectID)
@Html.ValidationMessageFor(m => m.Name)
The view displays this
The problem is that when I submit the form the Tasks are populated with everything except the virtual Project property... so the error i get it is
The operation failed: The relationship could not be changed because one or more of the foreign-key properties is non-nullable. When a change is made to a relationship, the related foreign-key property is set to a null value. If the foreign-key does not support null values, a new relationship must be defined, the foreign-key property must be assigned another non-null value, or the unrelated object must be deleted.
Here is a pic of my debugging breakpoint result
Please Help.
UPDATE:
I have changed my controller action to this
[HttpPost]
public ActionResult Edit(Project project)
{
if (ModelState.IsValid)
{
db.Entry(project).State = EntityState.Modified;
db.SaveChanges();
TempData["Success"] = "Modelo Valido";
return RedirectToAction("Index");
}
return View(project);
}
it is still not working correctly. Now changes made to the Name of the project are updated correctly in the database. but changes made to any Task Name are ignored completely.