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POMVC3 Buddy Classes, ViewModels and Validation
 

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    <p>I'm currently working on my first MVC project which is nothing more than a glorified blog for my own learning purposes. I started out with a database-first approach as I had no idea code-first even existed at that point. That's left me with some confusion as to how I should be handling validation.</p> <p>I have an <code>Articles</code> table in the database which has a corresponding <code>Article</code> class which has been generated for me by EF. I also have an <code>ArticleViewModel</code> class which has a matching property for each of the properties in <code>Article</code>. Whilst I have simple CRUD operations working, they are currently using a strongly-typed <code>Article</code> model instead of <code>ArticleViewModel</code> and there is no data validation taking place.</p> <p>After doing some research today to evaluate my options, I've found the <a href="https://stackoverflow.com/questions/5700464/asp-mvc3-database-first">following</a> <a href="https://stackoverflow.com/questions/5797312/ef-model-first-or-code-first-approach">questions</a> and <a href="http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx" rel="nofollow noreferrer">this</a> blog post. So it looks as though I can apply the <code>MetadataType</code> attribute to the EF generated classes and put my validation there, but I keep reading that buddy classes containing validation are bad practice. I have no idea why that is, but if that's the case, would that mean I should ignore buddy classes and be doing something like the following?</p> <pre><code>[MetadataType(typeof(ArticleViewModel))] public partial class Article { public Article(ArticleViewModel avm) { // Copy the properties from the ArticleViewModel into an Article. } } </code></pre> <p>Then applying DataAnnotations to the ArticleViewModel as necessary and updating my controllers/views to use <code>ArticleViewModel</code>?</p> <p>Thanks in advance for any input. :)</p>
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