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POEF5 code first ordering nested items
 

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    <p>I'm stumbling upon a small issue when retrieving a set of data with Entity Framework 5 Code First. Here's my code:</p> <pre><code>var data = context.Customers .Include("Orders") .Include("Orders.Items") .Include("Orders.Items.Article").ToArray(); foreach (var customer in data) { customer.Orders = customer.Orders.OrderByDescending(o =&gt; o.OrderDate).ToArray(); } </code></pre> <p>This works (whoo!). But, I'm trying to get that <code>foreach</code> out of there, I want the database engine to remain responsible for processing data. How do I do this? </p> <p>I've tried this type of join:</p> <pre><code>var data = from customer in context.Customers select new { customer.Id, customer.Name, // customer.Orders below doesn't have an Include() to include order items Orders = customer.Orders.OrderByDescending(b =&gt; b.OrderDate) }; // Translate anonymous object to actual models var customers = new List&lt;CustomerModel&gt;(); foreach (var customer in data) { customers.Add(new CustomerModel() { Id = customer.Id, Name = customer.Name, Orders = customer.Orders.ToArray() }); } </code></pre> <p>But, as the comment says, <code>customer.Orders</code> doesn't have an <code>Include()</code> method to include items and articles belonging to those items. I then tried to get in from the <code>context</code> instead of the <code>customer</code> object:</p> <p><code>Orders = context.Orders.Include("Items").Where(o =&gt; o.Id == customer.Id)</code></p> <p>But this results in a runtime exception that <code>Include()</code> cannot be used this way (in nested queries?):</p> <pre><code>Method 'System.Data.Entity.Infrastructure.DbQuery`1[MyTests.Models.OrderModel] Include(System.String)' declared on type 'System.Data.Entity.Infrastructure.DbQuery`1[MyTests.Models.OrderModel]' cannot be called with instance of type 'System.Data.Objects.ObjectQuery`1[MyTests.Models.OrdersModel]' </code></pre> <p>Is something like that even possible, nesting it out like that?</p> <p><strong>How do I make the database process the data instead of using a <code>foreach</code> in my first code block?</strong></p> <p>Thanks in advance.</p> <p>JP</p>
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