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PONHIbernate (3.1) - Linq group by then order by count issue
 

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  1. PONHIbernate (3.1) - Linq group by then order by count issue
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    <p>I am trying to get a group by followed by an order by count to work but I keep getting a 'Antlr.Runtime.NoViableAltException' being thrown.</p> <p>Here is the simplest error case I can create.</p> <pre><code>var results = ArticleStatsRepository.GetAll().GroupBy(x =&gt; x.Article.ArticleId) .OrderBy(x =&gt; x.Count()); </code></pre> <p>ArticleStatsRepository.GetAll() returns an IQueryable of ArticleStats. </p> <pre><code>public class ArticleStats { public virtual int ArticleStatsId { get; set; } public virtual Article Article { get; set; } public virtual User Viewer { get; set; } public virtual ArticleStatTypeEN ArticleStatType { get; set; } public virtual DateTime DateTime { get; set; } } </code></pre> <p>Ultimately I would like the following query to execute. </p> <pre><code>return ArticleStatsRepository.GetAll() .Where(x =&gt; x.DateTime &gt; DateTime.Now.Add(-timeSpan)) .Where(x =&gt; x.ArticleStatType == ArticleStatTypeEN.View) .GroupBy(x =&gt; x.Article.ArticleId) .Select(x =&gt; new { ArticleId = x.Key, Count = x.Count() }) .OrderByDescending(x =&gt; x.Count) .Join(ArticleRepository.GetAll(), artStats =&gt; artStats.ArticleId, articles =&gt; articles.ArticleId, (artStats, articles) =&gt; new MostPopularArticleResult { ArticleId = artStats.ArticleId, ArticleTitle = articles.Content.Title, Count = artStats.Count }); </code></pre> <p>I am using Fluent NHibernate 1.2.0.712 which references NHibernate: 3.1.0.4000.</p> <p>Any help would be greatly appreciated!</p> <p>Regards</p> <p>Steve</p> <p>Update: This is how I got round the issue. Not perfect as I didn't want to start using HQL with its QueryOver and would of liked to stick to IQueryable throughout. </p> <pre><code> public virtual IQueryable&lt;MostPopularArticleResult&gt; GetMostPopularArticleResults(TimeSpan timeSpan, IQueryable&lt;Article&gt; filteredArticles, List&lt;ArticleStatTypeEN&gt; types, int take) { var results = ArticleStatsRepository.GetAllQueryOver().Where(x =&gt; x.DateTime &gt; DateTime.Now.Add(-timeSpan)); results = results.Where(x =&gt; x.ArticleStatType.IsIn(types)); var articleIdsWithCounts = results.Select( Projections.Group&lt;ArticleStats&gt;(x =&gt; x.Article.ArticleId), Projections.Count&lt;ArticleStats&gt;(x =&gt; x.Article.ArticleId)) .OrderBy(Projections.Count&lt;ArticleStats&gt;(x =&gt; x.Article.ArticleId)) .Desc .Take(take) .List&lt;object[]&gt;() .Select(x =&gt; new { ArticleId = (int)x[0], Count = (int)x[1] }); return articleIdsWithCounts.Join(filteredArticles, artStats =&gt; artStats.ArticleId, articles =&gt; articles.ArticleId, (artStats, articles) =&gt; new MostPopularArticleResult { ArticleId = artStats.ArticleId, ArticleTitle = articles.Content.Title, Count = artStats.Count }) .AsQueryable(); } </code></pre>
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    1. CODo I understand it correctly? You want to order by the number of elements in the group?
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    2. COExactly, then I want to join those results to another table - I would then do a take so I only pull back x number of results. Ta
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    3. COCan you use QueryOver, or has to be LINQ?
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