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Many of the recipes we selected for this book take on the task of modeling some of these more challenged database designs. We ve found hundreds of examples of these databases in the wild and we ve worked with many developers in the Entity Framework community who have struggled to model these databases. We ve taken these experiences and selected a number of recipes that will help you solve these problems.

However, one thing we can do is make sure that our intended permissions structures maintain integrity To do this, we can routinely audit our hierarchies to ensure that there are no unknown changes, and that even the files themselves have not changed This can be used to ensure for instance that someone has not hijacked a program in your path and injected their own version Fortunate for you, dear admin, is the fact that OS X includes by default a powerful tool for performing such an audit: mtree Located at /usr/sbin/mtree, this command can be used to generate a specification file that contains information about the provided file system hierarchy This specification can then be later referenced for comparison against the live file system Any changes to the current structure from the specification will be reported.

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Browser Differences: If you develop a web site for the desktop, you ll probably be in good shape if it runs well in Firefox and Internet Explorer If you re developing a general mobile web site, you need to be prepared to support dozens of different browsers, each with different versions and problems Supporting all this can be a nightmare, especially if you use unusual features or want a goodlooking site Lack of Control: The user drives the browser configuration, and many do choose to speed things up by disabling images or otherwise lowering their capabilities Limited Capabilities: Web sites simply don t have access to many of a phone s capabilities, such as the microphone or the file system Slow Connections: Many users are still using slower data networks, and others may be stuck with a weak signal Don t assume that everyone is connecting over a fat pipe.

product2.RelatedProducts.Add(product3); product1.RelatedProducts.Add(product2); context.Products.AddObject(product1); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { var product1 = context.Products.First(p => p.Name == "Pole"); Dictionary<int, Product> t = new Dictionary<int, Product>(); GetRelated(product1, t); Console.WriteLine("Products related to {0}", product1.Name); foreach (var key in t.Keys) { Console.WriteLine("\t{0}", t[key].Name); } } } static void GetRelated(Product p, Dictionary<int, Product> t) { p.RelatedProducts.Load(); foreach (var relatedProduct in p.RelatedProducts) { if (!t.ContainsKey(relatedProduct.ProductId)) { t.Add(relatedProduct.ProductId, relatedProduct); GetRelated(relatedProduct, t); } } p.OtherRelatedProducts.Load(); foreach (var otherRelated in p.OtherRelatedProducts) { if (!t.ContainsKey(otherRelated.ProductId)) { t.Add(otherRelated.ProductId, otherRelated); GetRelated(otherRelated, t); } } } In Listing 6-4, we use the Load() method (see the Recipes in 5) to ensure that the collections of related products are loaded. Unfortunately, this means we will end up with many additional round trips to the database. We might be tempted to load all the rows from the Product table up front and hope that relationship span would fix up the associations. However, relationship span will not fix up entity collections, only entity references. Because our associations are many-to-many (entity collections), we cannot rely on relationship span to help out and we have to resort to using the Load() method. Following is the output of the code in Listing 6-4. From the first block of code that inserts the relationships, we can see that a Pole is related to a Tent, and a Tent is related to Ground Cover. The transitive closure for the products related to a Pole includes a Tent, Ground Cover, and Pole. Pole is included because it is on the other side of the relationship with Tent, which is a related product.

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