Question

我正在使用NHibernate和FluentNH。

以下是四个班级。

FormType

  public class FormType
  {
    public virtual int Id
    { get; set; }

    public virtual string Name
    { get; set; }

    public virtual IList<KeyCompetency> KeyCompetencies 
    { get; set; }
  }

KeyCompetency

  public class KeyCompetency
  {
    public virtual int Id
    { get; set; }

    public virtual string Name
    { get; set; }

    public virtual FormType FormType
    { get; set; }

    public virtual IList<SubCompetency> SubCompetencies 
    { get; set; }
  }

SubCompetency

  public class SubCompetency
  {
    public virtual int Id
    { get; set; }

    public virtual string Name
    { get; set; }    


    public virtual KeyCompetency KeyCompetency
    { get; set; }

    public virtual IList<Ability> Abilities 
    { get; set; }
  }

能力

  public class Ability
  {
    public virtual int Id
    { get; set; }

    public virtual string Description
    { get; set; }

    public virtual SubCompetency SubCompetency
    { get; set; }
  }

我试图加载基于id的表单类型。

using (var session = DataContext.OpenSession())
{
    return session.Query<FormType>()
                  .Where(x => x.Id == 1)
                  .FetchMany(x => x.KeyCompetencies)
                  .ThenFetchMany(x => x.SubCompetencies)
                  .ThenFetchMany(x => x.Abilities)
                  .ToList().FirstOrDefault();
}

我获得了关键能力，子能力的重复记录。

Answer 1

将集合映射为Set以避免此问题。请参阅this question的答案。此外，由于您是按身份进行选择，因此最好使用.SingleOrDefault代替FirstOrDefault。

急切地装载儿童的问题

1 个答案: