更新实体框架中的子表

Question

我的数据库中有2个表：“竞争”和“竞争结果”。每个比赛将始终有3个答案。我希望能够为同一视图编辑Competition和CompetitionAnswers。我设法通过使用编辑器模板使视图起作用

这是我的编辑器模板：

 @ModelType golfbug.Answer

<div class="editor-label left">
 Answer:<br />
 </div>
<div class="editor-field right">
@html.HiddenFor(Function(model) model.CompetitionID)
@Html.HiddenFor(Function(model) model.CompetitionAnswersID)
@Html.EditorFor(Function(model) model.CompetitionAnswer)
</div>
<div class="clear"></div>

这是我的观点

@ModelType golfbug.Competition

@Code
ViewData("Title") = "Edit"
End Code

<h2>Edit</h2>

<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript">       </script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")"    type="text/javascript"></script>

@Using Html.BeginForm()
@Html.ValidationSummary(True)
@<fieldset>
    <legend>Competition</legend>

    @Html.HiddenFor(Function(model) model.CompetitionID)

    <div class="editor-label left">
        @Html.LabelFor(Function(model) model.ClientID, "Client")
    </div>
    <div class="editor-field right">
        @Html.DropDownList("ClientID", String.Empty)
        @Html.ValidationMessageFor(Function(model) model.ClientID)
    </div>
    <div class="clear"></div>
    <div class="editor-label left">
        @Html.LabelFor(Function(model) model.StartDate)
    </div>
    <div class="editor-field right">
        @Html.EditorFor(Function(model) model.StartDate)
        @Html.ValidationMessageFor(Function(model) model.StartDate)
    </div>
      <div class="clear"></div>
    <div class="editor-label left">
        @Html.LabelFor(Function(model) model.CompetitionName)
    </div>
    <div class="editor-field right">
        @Html.EditorFor(Function(model) model.CompetitionName)
        @Html.ValidationMessageFor(Function(model) model.CompetitionName)
    </div>
      <div class="clear"></div>
    <div class="editor-label left">
        @Html.LabelFor(Function(model) model.CompetitionDetails)
    </div>
    <div class="editor-field right">
        @Html.EditorFor(Function(model) model.CompetitionDetails)
        @Html.ValidationMessageFor(Function(model) model.CompetitionDetails)
    </div>
      <div class="clear"></div>
    <div class="editor-label left">
        @Html.LabelFor(Function(model) model.CompettionQuestion)
    </div>
    <div class="editor-field right">
        @Html.EditorFor(Function(model) model.CompettionQuestion)
        @Html.ValidationMessageFor(Function(model) model.CompettionQuestion)
    </div>
    <div class="clear"></div>

    @Html.EditorFor(Function(model) model.Answers)



    <p>
        <input type="submit" value="Save" />
    </p>
</fieldset>
 End Using

<div>
@Html.ActionLink("Back to List", "Index")
</div>

当我点击保存按钮时，我需要控制器更新答案表中的答案。目前，我只有Visual Studio生成的代码。我想我必须遍历答案并更新答案，但是我不确定如何做到这一点。

这是我的控制器代码：

Function Edit(competition As Competition) As ActionResult
        If ModelState.IsValid Then

            db.Competitions.Attach(competition)
            db.ObjectStateManager.ChangeObjectState(competition, EntityState.Modified)

            db.SaveChanges()

            Return RedirectToAction("Index")
        End If

        ViewBag.ClientID = New SelectList(db.Clients, "ClientID", "ClientName", competition.ClientID)
        Return View(competition)
    End Function

任何帮助将不胜感激。我已经在Google上搜索了2天了。