流畅的 nhibernate 循环依赖

Question

我有 2 个实体，一切正常，除了 NHibernate 不会在对象的第二个实体中加载 FieldGroupItems 属性。我怀疑这是因为这两个实体之间存在循环依赖。我确实需要 ChildGroups 和 FieldGroupItems。如果我删除 ChildGroups，则 FieldGroupItems 加载正常。有没有办法得到我想要的。我能想到的唯一方法是使用 Guid 集合而不是对象集合来仅存储 ID 并从代码中手动获取数据。感谢任何帮助。

public class FieldGroupItemInstance : TenantBaseEntity
{
    public virtual Guid ItemId { get; set; }  //ID from the database to update actual object later
    public virtual bool IsTemporaryId { get; set; }  //true if field group is new (doesn't exist in system)
    public virtual IList<QuestionnaireInstanceField> Fields { get; set; }
    public virtual IList<QuestionnaireFieldGroupInstance> ChildGroups { get; set; }

    public FieldGroupItemInstance()
    {
        Fields = new List<QuestionnaireInstanceField>();
        ChildGroups = new List<QuestionnaireFieldGroupInstance>();
    }
}

public class QuestionnaireFieldGroupInstance : TenantBaseEntity
{
    public virtual Guid FieldGroupTemplateId { get; set; }
    public virtual IList<FieldGroupItemInstance> FieldGroupItems { get; set; } //Each repeated group of instances
    //public virtual FieldGroupItemInstance Parent { get; set; }

    public QuestionnaireFieldGroupInstance()
    {
        FieldGroupItems = new List<FieldGroupItemInstance>();
    }
}

Answer 1

如果您使用 fluentnhibernate 来映射您的实体，这应该可行。只需注意 Cascade 选项即可。

public class FieldGroupItemInstanceMap() 
{
        public FieldGroupItemInstanceMap()
        {
                Table("FieldGroupItemInstance");

                HasManyToMany(x => x.ChildGroups)
                        .Table("FieldGroupItemInstance_QuestionnaireFieldGroupInstance")
                        .ParentKeyColumn("IdFieldGroupItemInstance")
                        .ChildKeyColumn("IdQuestionnaireFieldGroupInstance")
                        .Cascade.None();
        }
}

public class QuestionnaireFieldGroupInstanceMap() 
{
        public QuestionnaireFieldGroupInstanceMap()
        {
                Table("QuestionnaireFieldGroupInstance");

                HasManyToMany(x => x.FieldGroupItems)
                        .Table("FieldGroupItemInstance_QuestionnaireFieldGroupInstance")
                        .ParentKeyColumn("IdQuestionnaireFieldGroupInstance")
                        .ChildKeyColumn("IdFieldGroupItemInstance")
                        .Cascade.None();
        }
}

流畅的 nhibernate 循环依赖

fluent nhibernate circular dependencies

.net

c#

nhibernate

fluent-nhibernate