Criteria API - 如何根據收集計數獲取記錄？

Question

我在ActiveRecord的一個問題類具有以下字段：

[ActiveRecord("`Question`")] 
public class Question : ObcykaniDb<Question> { 

    private long id; 
    private IList<Question> relatedQuestions; 

    [PrimaryKey("`Id`")] 
    private long Id { 
     get { return this.id; } 
     set { this.id = value; } 
    } 

    [HasAndBelongsToMany(typeof(Question), ColumnRef = "ChildId", ColumnKey = "ParentId", Table = "RelatedQuestion")] 
    private IList<Question> RelatedQuestions { 
     get { return this.relatedQuestions; } 
     set { this.relatedQuestions = value; } 
    } 
} 

我怎樣寫一個的DetachedCriteria查詢來獲取具有在RelatedQuestions收集至少5相關的問題（計數）的所有問題嗎？

現在這給了我奇怪的結果：

DetachedCriteria dCriteria = DetachedCriteria.For<Question>() 
      .CreateCriteria("RelatedQuestions") 
      .SetProjection(Projections.Count("Id")) 
      .Add(Restrictions.EqProperty(Projections.Id(), "alias.Id")); 

DetachedCriteria dc = DetachedCriteria.For<Question>("alias").Add(Subqueries.Le(5, dCriteria)); 
IList<Question> results = Question.FindAll(dc); 

任何想法我做錯了嗎？

Answer 1

試着這麼做：

var dc = DetachedCriteria.For<Question>() 
    .SetProjection(Projections.ProjectionList() 
         .Add(Projections.GroupProperty("Id"))) 
    .Add(Restrictions.Ge(Projections.Count("RelatedQuestions"), 5)) 
    .SetResultTransformer(new AliasToBeanResultTransformer(typeof(Question))); 
var questions = Question.FindAll(dc);