的LINQ to NHibernate和子對象的查詢

我有這個Linq查詢：的LINQ to NHibernate和子對象的查詢

var query = (from i in session.Query<Photo>() 
        where i.IsApproved == true 
        select i); 

      if (topPhotoEnum.Equals(TimeModeEnum.Today)) 
       query = query.Where(x => x.UploadDate >= DateTime.Today 
             && x.UploadDate <= DateTime.Now); 

//return query.OrderByDescending(x => x.Votes.Count).Take(number).ToList(); 

return query.ToList() 
      .OrderByDescending(x => x.Votes.Count).Take(number).ToList();

這裏的問題是，我從數據庫中檢索所有數據，然後我打電話OrderByDescending和Take過濾數據。

我寧願讓數據庫過濾器的數據，但似乎Linq NHibernate提供商不支持.OrderByDescending(x => x.Votes.Count)因爲是一個子集合操作。

Antlr.Runtime.NoViableAltException

NHibernate.Hql.Ast.ANTLR.ErrorCounter.ThrowQueryException（）100
NHibernate.Hql.Ast.ANTLR.HqlSqlTranslator.Translate（）305
NHibernate的.Hql.Ast.ANTLR.QueryTranslatorImpl.Analyze（字符串 collectionRole）99
NHibernate.Hql.Ast.ANTLR.QueryTranslatorImpl.DoCompile（IDictionary的替換，布爾淺）44
NHibernate.Hql.Ast .ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators（IASTNode AST，字符串queryIdentifier，字符串collectionRole，布爾淺， IDictionary的2 filters, ISessionFactoryImplementor factory) +320 NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(String queryIdentifier, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary 2個濾波器， ISessionFactoryImplementor工廠）66個
NHibernate.Engine.Query.HQLExpressionQueryPlan.CreateTranslators（字符串 expressionStr，IQueryExpression queryExpression ，字符串 collectionRole，布爾淺，IDictionary的2 enabledFilters, ISessionFactoryImplementor factory) +86 NHibernate.Engine.Query.HQLExpressionQueryPlan..ctor(String expressionStr, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary 2 enabledFilters， ISessionFactoryImplementor工廠）63
NHibernate.Engine.Query.HQLExpressionQueryPlan..ctor（字符串 expressionStr，IQueryExpression queryExpression，布爾淺， IDictionary的2 enabledFilters, ISessionFactoryImplementor factory) +53 NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow, IDictionary 2 enabledFilters）249
NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan（IQueryExpression queryExpression，布爾淺）185
NHibernate.Impl.AbstractSessionImpl.CreateQuery（IQueryExpression queryExpression）158
NHibernate.Linq.NhQueryProvider.PrepareQuery （表達式表達， IQUERY &查詢，NhLinqExpression & nhQuery）82
NHibernate.Linq.NhQueryProvider.Execute（表達式表達）58
NHibernate.Linq.NhQueryProvider.Execute（表達式表達）43
Remotion.Data.Linq.QueryableBase 1.GetEnumerator() +120 System.Collections.Generic.List 1..ctor（IEnumerable的1 collection) +315 System.Linq.Enumerable.ToList(IEnumerable 1源）+58