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POEditing a collection in a partial view
 

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    <p>I was having problems updating child collections of my object ( <a href="https://stackoverflow.com/questions/10170101/foreign-key-constraint-ef-with-collection-of-childobjects/">Foreign key constraint, EF with collection of childobjects</a> ) which was solved using this guide: <a href="http://www.codetuning.net/blog/post/Binding-Model-Graphs-with-ASPNETMVC.aspx" rel="nofollow noreferrer">http://www.codetuning.net/blog/post/Binding-Model-Graphs-with-ASPNETMVC.aspx</a></p> <p>When cleaning up my code, I moved the collection editing to a partial view.</p> <pre><code>@Html.Partial("_AttendeeInformationFields", Model.CaptureAttendeeInformationFields) </code></pre> <p>The partial view looks like this</p> <pre><code>@model ICollection&lt;EventModel.Models.AttendeeInformationField&gt; &lt;table id="CaptureAttendeeInformationFields"&gt; &lt;tr&gt; &lt;th&gt;@Html.GetDisplayName(model =&gt; model.FirstOrDefault().Name)&lt;/th&gt; &lt;th&gt;@Html.GetDisplayName(model =&gt; model.FirstOrDefault().Required)&lt;/th&gt; &lt;th&gt;@Html.GetDisplayName(model =&gt; model.FirstOrDefault().FieldType)&lt;/th&gt; @*&lt;th&gt;@Html.GetDisplayName(model =&gt; model.FirstOrDefault().InputType)&lt;/th&gt;*@ &lt;/tr&gt; @Html.EditorForModel() &lt;/table&gt; @Html.LinkToAddNestedForm("Lägg till", "#CaptureAttendeeInformationFields", ".AttendeeInformationField", "CaptureAttendeeInformationFields", typeof(EventModel.Models.AttendeeInformationField)) @Html.ValidationMessageFor(model =&gt; model) </code></pre> <p>Then I have a EditorTemplate for AttendeeInformationField that looks like this</p> <pre><code>@model EventModel.Models.AttendeeInformationField &lt;tr class="AttendeeInformationField"&gt; @using (Html.BeginCollectionItem("CaptureAttendeeInformationFields")) { &lt;td&gt;@Html.TextBoxFor(model =&gt; model.Name) @Html.HiddenFor(model =&gt; model.MagnetEventId) @Html.HiddenFor(model =&gt; model.Id)&lt;/td&gt; &lt;td&gt;@Html.CheckBoxFor(model =&gt; model.Required)&lt;/td&gt; &lt;td&gt;@Html.DropDownListFor(model =&gt; model.FieldType, new SelectList(Enum.GetValues(typeof(EventModel.Models.FieldType)), Model.FieldType))&lt;/td&gt; @*&lt;td&gt;@Html.TextBoxFor(model =&gt; model.InputType)&lt;/td&gt;*@ } &lt;/tr&gt; </code></pre> <p>The BeginCollectionItem is from this guide: <a href="http://ivanz.com/2011/06/16/editing-variable-length-reorderable-collections-in-asp-net-mvc-part-1/" rel="nofollow noreferrer">http://ivanz.com/2011/06/16/editing-variable-length-reorderable-collections-in-asp-net-mvc-part-1/</a> This helps me with two things 1. The index is no longer a sequential 0-based integer series, and I can reorder my items, as well as add/delete without worrying about breaking the sequence. 2. The partial seems to loose the context, and my controls get names like "[0].Required" where it should be "CaptureAttendeeInformationField[0].Required". The BeginCollectionItem takes care of this.</p> <p>The current problem is that these fixes doesn't seem to be compatible. I suppose it might have something to do with this disclaimer in the first article:</p> <blockquote> <p>within this implementation we assume that the index is an integer starting at 0</p> </blockquote> <p>I'm hoping that someone can point me in the right direction. Adding items in this solution works.</p> <p><strong>Ugly solution</strong> I sure hope this is not the only way to do this, but for now I've solved the problem like this:</p> <pre><code>foreach (var attendeeInformationField in viewModel.AttendeeInformationFields) { var attendeeInformationFieldId = attendeeInformationField.Id; var originalAttendeeInformationField = original.CaptureAttendeeInformationFields.FirstOrDefault(aif =&gt; aif.Id == attendeeInformationFieldId); if (originalAttendeeInformationField==null) { original.CaptureAttendeeInformationFields.Add(attendeeInformationField); } else { if (originalAttendeeInformationField != attendeeInformationField) { originalAttendeeInformationField = attendeeInformationField; originalAttendeeInformationField.FieldType = attendeeInformationField.FieldType; //originalAttendeeInformationField.InputType = attendeeInformationField.InputType; originalAttendeeInformationField.Name = attendeeInformationField.Name; originalAttendeeInformationField.Required = attendeeInformationField.Required; } } } </code></pre> <p>I don't like it at all, but it works. There must be a better way of doing this.</p>
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