Passing back child entity from MVC view to controller

Question

I'm trying to delete entries which are marked (checked) in view, but not sure how to pass back the collection back to the controller
my mode is:
Group which has ICollection<SubGroup> SubGroups and SubGroup has ICollection<Event> Events
I pass Group to the view and iterate and display Event details including a checkbox so if it's checked the event entry should be deleted.
When I get the postback to the controller, Group.SubGroups is null

How do I make sure the child entities are passed back to the controller?
Can I use @Html.CheckBox instead Of <input type="checkbox"... ?

Update: Model

public class Group
{
    [Key]
    public int GroupId { get; set; }
    public virtual IList<SubGroup> SubGroups { get; set; }
    ....
}

public class SubGroup
{
    [Key]
    public int SubGroupId { get; set; }
    public virtual IList<Event> Events { get; set; }
    ....
}

public class Events
{
    [Key]
    public int EventId { get; set; }
    public string EventName { get; set; }
    public bool IsDeleted { get; set; }
    ....
}

I am passing Group to the view (see below) as the Model and want to delete events which are checked by the user

View:

@using System.Globalization
@model NS.Models.Group
@{
    ViewBag.Title = "Edit";
}
@using (Html.BeginForm())
{
    @Html.ValidationSummary(true)
    <fieldset>
        <legend>Booking Details</legend>
        <div class="display-label">
            Group Name
        </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.GroupName)
    </div>
    <div class="display-field">

        @foreach (var b in Model.SubGroup)
        {
            groupNo += 1;
            <table class="main" style="width: 80%; margin-top: 10px">
                <tr>
                    <th>
                        @Html.DisplayName("Sub Group ")
                        @Html.DisplayName(b.SubGroupName)
                    </th>

                </tr>
                <table class="main" style="width: 80%;">
                    <tr>
                        <th>Event</th>
                        <th>Delete</th>
                    </tr>
                    @foreach (var ev in b.Events)
                    {
                        <tr>
                            <td>
                                @Html.DisplayFor(modelItem => ev.EventName)
                            </td>
                            <td>
                                <input type="checkbox" id="eventToDelete" name="eventToDelete" value="@ev.EventId" />
                            </td>
                        </tr>
                    }
                </table>
            </table>
        }
    </div>
    <p>
        <input type="submit" name="xc" value="Delete" class="button" />
    </p>
</fieldset>
}

Thank You

possible duplicate of [CheckboxList in MVC3 View and get the checked items passed to the controller](http://stackoverflow.com/questions/5284395/checkboxlist-in-mvc3-view-and-get-the-checked-items-passed-to-the-controller) — Imad Alazani, Aug 14 '13 at 11:06
The above does not deal with navigation property. In my case I want to delete item from navigation property, which is 2 levels down from the parent — melspring, Aug 14 '13 at 13:26

score 0 · Answer 1 · answered Aug 14 '13 at 10:48

0

Try this...

 public ActionResult ViewName(FormCollection collection)
    {
       if(collection['eventToDelete']!=null && collection['eventToDelete'].ToString()!="")
       {
           //delete....
       }
       return....
    }

answered Aug 14 '13 at 10:48

Sebastian Wąsik

63
4

score 0 · Answer 2 · answered Aug 14 '13 at 11:12

0

Try this

 public ActionResult ViewName(Group model)
    {
       if(model != null && ModelState.IsValid)
       {
           //delete....
       }
       return....
    }

answered Aug 14 '13 at 11:12

Jaimin

7,964
2
25
32

Entry to be deleted is 2 levels down from the model, ie:Group.SubGroup.Event and subgroup is null so cannot do this – melspring Aug 14 '13 at 13:22
@melspring can you post your model.So we can understand what is your model structure. – Jaimin Aug 14 '13 at 13:31

Passing back child entity from MVC view to controller

2 Answers2