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  1. PO
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    <p>In my MVC apps I'm using architecture that Rob Conery showed on his MVC Storefront video series and it works like charm for me.</p> <p>Repository => Service + Filters => Controller => View</p> <p>I've tried to simulate what you want to achieve and managed todo like this</p> <p><strong>Edit1</strong>: Changed IList to IQueryable in repository and filters</p> <p>Repository</p> <pre><code>public interface IRepository { IQueryable&lt;Vote&gt; GetVotes(); IQueryable&lt;Story&gt; GetStories(); } </code></pre> <p>Service for getting what you want </p> <pre><code>public class Service : IService { private IRepository _repository; public Service(IRepository repository) { _repository = repository; if (_repository == null) throw new InvalidOperationException("Repository cannot be null"); } public IList&lt;Vote&gt; GetUserVotes(int userID) { return _repository.GetVotes().WithUserID(userID).ToList(); } public IList&lt;Story&gt; GetNotVotedStories(IList&lt;Vote&gt; votes) { return _repository.GetStories().WithoutVotes(votes).ToList(); } } </code></pre> <p>Filters to filter your stories and user votes (These are basically extension methods). Not the nicest implementation out there, but you can rewrite later</p> <pre><code>public static class Filters { public static IQueryable&lt;Vote&gt; WithUserID(this IQueryable &lt;Vote&gt; qry, int userID) { return from c in qry where c.UserID == userID select c; } public static IQueryable&lt;Story&gt; WithoutVotes(this IQueryable &lt;Story&gt; qry, IList &lt;Vote&gt; votes) { return from c in qry where votes.Where(x =&gt; x.StoryID == c.StoryID).ToList().Count &gt; 0 select c; } } </code></pre> <p>And then you can pass current UserID in controller, not in DAL or View like you had to do before</p> <pre><code>public class HomeController : Controller { private readonly IRepository _repository; private readonly IService _service; public HomeController() { _repository = new Repository(); _service = new Service.Service(_repository); } public ActionResult Index() { var userVotes = _service.GetUserVotes(CurrentUserID); var unvotedStories = _service.GetNotVotedStories(userVotes); return View(unvotedStories); } } </code></pre> <p>This allows you to stay away from adding user related UserVotedOn property to your Story model</p>
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    1. COI can see a performance issue when using IList<> instead of IQueryable<>. In the latter case, the query itself can be further enhanced by the filters before it's delay-executed by LINQ.
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      1. USDave Van den Eynde
    2. COI absolutely agree on that, as I've said I'd choose IQueryable too on repository and filters, and only later in service return cast to IList
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      1. USPaul G.
    3. COI like it. Though I kind of need to know if the current user has voted on a given story or not during rendering for the VOTE/UNVOTE link. I can adapt this. Thanks a lot for your help.
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      1. USChad Moran
 

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