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Showing posts from March, 2008

Postal codes within a radius

My hobby MVC website allows people to place adverts. When searching for adverts I would like the user to be able to specify a UK postal code and radius to filter the adverts down to ones within travelling distance. The trick to this was to record a list of UK postal codes and their latitude/longitude. The first step is to write a routine which will give a straight line distance between to coordinates: public static class MathExtender {   public static double GetDistanceBetweenPoints(double sourceLatitude, double sourceLongitude, double destLatitude, double destLongitude)   {     double theta = sourceLongitude - destLongitude;     double distance =       Math.Sin(DegToRad(sourceLatitude))       * Math.Sin(DegToRad(destLatitude))       + Math.Cos(DegToRad(sourceLatitude))       * Math.Cos(DegToRad(destLatitude))       * Math.Cos(DegToRad(theta));     distance = Math.Acos(distance);     distance = RadToDeg(distance);     distance = distance * 60 * 1.1515;     return (distance);   }

Test Driven MVC and ECO

I have decided that mocking IEcoServiceProvider is not the way to go. Your controller will use the mocked provider during testing but   You don’t want to have to mock every service the provider may return, it’s a lot of work!   You don’t want your controller using a mocked service, and then the EcoSpace using the real one! At first I was mocking every possible service request. IUndoService, IPersistenceService, IOclService, etc. I get bored typing them out in this blog, so doing it in tests was really annoying me. I decided I would instead only mock the service in question. So if I were ensuring that an action wont save an object with broken constraints I would mock GetEcoService<IConstraintProvider> and ensure that I always got a broken constraint. The problem was that the test to ensure I can save a valid object would then invoke the IPersistenceService.UpdateDatabaseWithList method. In my EcoSpace I have decorated my persistence service so that it checks every

ECO, LINQ, Anonymous types, and Web Extensions

I’ve been finding LINQ + Anonymous types really compliment ECO and the new ASP web extensions approach to writing websites. I may have mentioned recently that I don’t like the idea of passing instances of my business objects to the presentation layer. The reason is that someone else will be writing the views for this site and I want to be able to control what they are capable of displaying. It’s not just that though, the fact is that your view might need to look completely different to how your business classes are structured, one layer should not dictate the structure of another. The example I am about to show does in fact have similar structures for the view and model. Having said that there is a slight difference in that the MinorVersion class has its own "int VersionNumber" property, and gets the major part of the version number from self.MajorVersion.VersionNumber. Anyway, now to get on with it. My requirement was to show all major versions, within each major vers