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POUpdating only part of a model
 

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    <p>I'm using ASP.NET MVC 3 and Entity Framework Code First. I have a page (using Razor View Engine) which allows a user to update parts of a model (Product):</p> <p>@Html.LabelFor(model => model.Overview) @Html.TextAreaFor(model => model.Overview)</p> <pre><code>@Html.LabelFor(model =&gt; model.Description) @Html.TextAreaFor(model =&gt; model.Description) @Html.HiddenFor(model =&gt; model.ProductId) </code></pre> <p>My controller method looks like this:</p> <pre><code>[HttpPost] public ActionResult Update(Product product) { db.Products.Attach(product); db.SaveChanges(); } </code></pre> <p>All I want to do is to update the Overview and Description attributes of the Product model. However, when I run the code the model is not updated in the database, and I don't get any errors.</p> <p>When I inspect the product object whilst debugging, I see that whilst the ProductId, Overview and Description fields are correct (as per the FORM POST), the other fields are NULLs (which I would expect).</p> <p>I'm wondering if the incomplete state of the product object is causing it not to save to the database?</p> <p>Here is the model:</p> <p>public class Product { public int ProductId { get; set; }</p> <pre><code> [Required(ErrorMessage = "Please enter a description")] [DataType(DataType.MultilineText)] public string Description { get; set; } [DataType(DataType.MultilineText)] public string Overview { get; set; } public int SupplierId { get; set; } public virtual Supplier Supplier { get; set; } } </code></pre>
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