Question

How do i update a domain object with ViewModel with AutoMapper using Entity framework?

I have a View to edit a Question entity.

This is my Edit action:

    public ActionResult Edit(int id)
{
    var question = db.Question.Single(q => q.question_id == id);

    Mapper.CreateMap<Question, EditQuestionViewModel>();
    EditQuestionViewModel eqvm = Mapper.Map<Question, EditQuestionViewModel>(question);

    eqvm.QuestionTypes = new SelectList(db.Question_Type, "type_code", "type_description", question.type_code);
    eqvm.Categories = new SelectList(db.Category, "category_id", "category_name", question.category_id);

    eqvm.Visibility = new SelectList(new Dictionary<int, string> {
        { 1, "Ja"},
        { 0, "Nej"}
    }, "Key", "Value");

    return View(eqvm);
}

And my ViewModel looks like this:

 public class EditQuestionViewModel
{
    public int question_id { get; set; }
    public string question_wording { get; set; }
    public bool visible { get; set; }
    public int question_number { get; set; }
    public string help_text { get; set; }
    public Category Category { get; set; }
    public Question_Type Question_Type { get; set; }

    public string SelectedCategory { get; set; }
    public string SelectedQuestionType { get; set; }
    public SelectList Categories { get; set; }
    public SelectList QuestionTypes { get; set; }
    public SelectList Visibility { get; set; }
    public string RefUrl { get; set; }

}

This is the View:

    @using (Html.BeginForm("Edit", "AdminQuestion", FormMethod.Post))
{
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>Spørgsmål</legend>
        <div class="editor-label">
            @Html.LabelFor(model => model.question_wording, "Spørgsmål")
        </div>
        <div class="editor-field">
            @Html.TextAreaFor(model => model.question_wording, new { @class = "required", rows = 3, cols = 50 })
            @Html.ValidationMessageFor(model => model.question_wording)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.SelectedCategory, "Hvilken kategori tilhører dette spørgsmål?")
        </div>
        <div class="editor-field">
            @Html.DropDownListFor(model => model.SelectedCategory, Model.Categories)
            @Html.ValidationMessageFor(model => model.SelectedCategory)
        </div>
        <div class="editor-label">
            @Html.LabelFor(x => x.SelectedQuestionType, "Spørgsmålstype")
        </div>
        <div class="editor-field">
            @Html.DropDownListFor(model => model.SelectedQuestionType, Model.QuestionTypes)
            @Html.ValidationMessageFor(model => model.SelectedQuestionType)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.visible, "Skal dette spørgsmål være synligt?")
        </div>
        <div class="editor-field">
            @Html.DropDownListFor(model => model.visible, Model.Visibility)
            @Html.ValidationMessageFor(model => model.visible)
        </div>

          <div class="editor-label">
            @Html.LabelFor(model => model.question_number, "Hvilket nummer har spørgsmålet inden for sin kategori?")
        </div>
        <div class="editor-field">
            @Html.TextBoxFor(model => model.question_number, new { @class = "required digits" })
            @Html.ValidationMessageFor(model => model.question_number)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.help_text, "Hjælpetekst som hjælper brugeren med at forstå spørgsmålet:")
        </div>
        <div class="editor-field">
            @Html.TextAreaFor(model => model.help_text, new { rows = 20, cols = 50 })
            @Html.ValidationMessageFor(model => model.help_text)
        </div>
        <br />
        <input type="submit" value="Gem" />

    </fieldset>

How do i update the entity when i submit the form ?
How should the mapping between the ViewModel and EF Model look like, using AutoMapper?

The properties

public string SelectedCategory { get; set; }
public string SelectedQuestionType { get; set; }

In the ViewModel are supposed to be linked with category_id and type_code in the EF model

Also notice the property

public bool visible { get; set; }

I use BIT in my database. Will this work with the values 0 and 1, which is use in the SelectList?

Thanks!

Answer 1

you would need to get the object from entity framework, and then use automapper like this:

var item = repository.getbyid(model.Id);
_mappingEngine.Map(viewModel, item);
repository.save(item);