How to Edit and Save ViewModels data back to database

Question

I have a ViewModel which is joined by three Entities to get data from all entities into one view form. Although i succeeded to implement the same. But i have no idea how to Edit

Answer 1

First of all, it's really good that you are using ViewModels but for this particular case, it's probably not necessary, your Create view could look like this:

@model MvcApplication1.Models.Doctor

//other fields here


        @Html.LabelFor(model => model.DoctorAddress.Address)
    
    

        @Html.EditorFor(model => model.DoctorAddress.Address)
        @Html.ValidationMessageFor(model => model.DoctorAddress.Address)
    

    

        @Html.LabelFor(model => model.DoctorCharge.IPDCharge)
    
    

        @Html.EditorFor(model => model.DoctorCharge.IPDCharge)
        @Html.ValidationMessageFor(model => model.DoctorCharge.IPDCharge)


//other fields here

Then your Doctor controller:

[HttpPost]
public ActionResult Create(Doctor doctor)
{
    if (ModelState.IsValid)
    {
        db.Doctors.Add(doctor);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    return View(doctor);
}

Your `Edit` action could then look like this:

[HttpGet]
public ActionResult Edit(int id = 0)
{
    Doctor doctor = db.Doctors.Find(id);
    if (doctor == null)
    {
        return HttpNotFound();
    }
    return View(doctor);
}

[HttpPost]
public ActionResult Edit(Doctor doctor)
{
    if (ModelState.IsValid)
    {
        db.Entry(doctor).State = EntityState.Modified;
        db.Entry(doctor.DoctorAddress).State = EntityState.Modified;
        db.Entry(doctor.DoctorCharge).State = EntityState.Modified;
        db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(doctor);
}

If you want to keep your ViewModel then it could look like this:

[HttpPost]
public ActionResult Edit(DoctorViewModel doctorViewModel)
{
    if (ModelState.IsValid)
    {
        var doctorAddress = doctorViewModel.DoctorAddress;
        var doctorCharge = doctorViewModel.DoctorCharge;
        var doctor = doctorViewModel.Doctor;
        db.Entry(doctorAddress).State = EntityState.Modified;
        db.Entry(doctorCharge).State = EntityState.Modified;
        db.Entry(doctor).State = EntityState.Modified;
        db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(doctor);
}