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POTrying to edit an entity with data from dropdowns in MVC
 

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  1. POTrying to edit an entity with data from dropdowns in MVC
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    <p>I'm having trouble getting my head around sending multiple models to a view in mvc. My problem is the following.</p> <p>Using EF4 I have a table with attributes organised by category.</p> <p>Couldn't post an image :-( [Have a table called attributes (AttributeTitle, AttributeName, CategoryID) connected to a table called Category (CategoryTitle).]</p> <p>What I want to do is be able to edit an attribute entity and have a dropdown of categories to choose from.</p> <p>I tried to make a custom viewmodel</p> <pre><code> public class AttributeViewModel { public AttributeViewModel() { } public Attribute Attribute { get; set; } public IQueryable&lt;Category&gt; AllCategories { get; set; } } </code></pre> <p>But it just ended up being a mess.</p> <pre><code>&lt;div class="editor-field"&gt; &lt;%: Html.DropDownList("Category", new SelectList((IEnumerable)Model.AllCategories, "CategoryID", "CategoryName")) %&gt; &lt;/div&gt; </code></pre> <p>I was getting it back to the controller... </p> <pre><code> [HttpPost] public ActionResult Edit(int AttributeID, FormCollection formcollection) { var _attribute = ProfileDB.GetAttribute(AttributeID); int _selcategory = Convert.ToInt32(formcollection["Category"]); _attribute.CategoryID = (int)_selcategory; try { UpdateModel(_attribute); (&lt;---Error here) ProfileDB.SaveChanges(); return RedirectToAction("Index"); } catch (Exception e) { return View(_attribute); } } </code></pre> <p>I've debugged the code and my _attribute looks correct and _attribute.CategoryID = (int)_selcategory updates the model, but then I get the error. </p> <p>Somewhere here I thought that there should be a cleaner way to do this, and that if I could only send two models to the view instead of having to make a custom viewmodel.</p> <p>To sum it up: I want to edit my attribute and have a dropdown of all of the available categories.</p> <p>Any help much appreciated!</p>
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    1. USbek
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    1. COThe error message would be helpful.
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    2. COSorry, didn't see your comment until now. It said something like "Can't update mode of type ...attribute". Was due to the fact that I was trying to updatemodel.
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