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Updating Parent / Child Entries Using Binders in ASP.Net MVC

I modified the Nerd Dinner app to allow editing of child records by adding the following code to DinnerForm.ascx

  <p>
    <%int i = 0;
   foreach (NerdDinner.Models.RSVP rsvp in this.Model.Dinner.RSVPs)
       { %>

        <%= Html.Hidden("Dinner.RSVPs[" + i + "].RsvpID", rsvp.RsvpID)%>
        <%= Html.Hidden("Dinner.RSVPs[" + i + "].DinnerID", rsvp.DinnerID)%>
        <%= Html.TextBox("Dinner.RSVPs[" + i + "].AttendeeName", rsvp.AttendeeName)%>
    <% i += 1;
   } %>
    </p>

he does this:

<p>
    <input id="Dinner_RSVPs[0]_RsvpID" name="Dinner.RSVPs[0].RsvpID" type="hidden" value="36" />
        <input id="Dinner_RSVPs[0]_DinnerID" name="Dinner.RSVPs[0].DinnerID" type="hidden" value="63" />
        <input id="Dinner_RSVPs[0]_AttendeeName" name="Dinner.RSVPs[0].AttendeeName" type="text" value="kp" />
    <input id="Dinner_RSVPs[1]_RsvpID" name="Dinner.RSVPs[1].RsvpID" type="hidden" value="37" />
        <input id="Dinner_RSVPs[1]_DinnerID" name="Dinner.RSVPs[1].DinnerID" type="hidden" value="63" />
        <input id="Dinner_RSVPs[1]_AttendeeName" name="Dinner.RSVPs[1].AttendeeName" type="text" value="jim" />

    </p>

I did not change the editing action method of the DinnersControler Post. Parent dinner is updated as usual, but UpdateModel (dinner) appears; does not see / does not update child RSVP records.

I tried several options for rendering child records so that the bindings in the Model would see the collection, with no luck.

Updates parent / child records in one shot, calling UpdateModel (Parent); perhaps with current model bindings?

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, , .. Dinner.RSV . , , , (.. Dinner.RSVP.Where(r = > r.RSVP_ID == input_id), ). , - .

, , rsvp int :

, :

UpdateModel("Dinner", Dinner);

, :

int i = 0;

foreach (var r in Dinner.RSVPs) {
  UpdateModel(r, "Dinner.RSVPs[" + i++ + "]");
}

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Note, I admit that James S solution is probably more “clean”, but in order to make it “one-shot”, as you ask, you need to either wait for ASP.NET 4.0 or use a workaround similar to what you will find in my other post.

Good luck

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