Fluent-Nhibernate多对多关系问题

Question

我在尝试使用Fluent Nhibernate删除多对多关系时遇到了一个问题。我有以下域类：

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

   private IList<OrganisationRelationshiop> relatedOrganisations; 

   public virtual IList<OrganisationRelationship> RelatedOrganisation
   {
       get
       {
           return this.relatedOrganisations;
       }

      protected set
      {
           this.relatedOrganisations = value;
      }
    }


    public virtual void RemoveRelatedOrganisation(OrganisationRelationship organisationRelationship)
    {
        this.relatedOrganisations.Remove(organisationRelationship);
    }

}

这是我的OrganisationRelationship类，它代表了组织之间的多对多关系。

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

       public virtual Organisation Organisation{ get; set; }

       public virtual OrganisationRelationshipType OrganisationRelationshipType { get; set; }

       public virtual Organisation RelatedOrganisation { get; set; }
   }

下面是表的脚本：

组织机构表：

CREATE TABLE [dbo].[Organisation](
[Id] [int] IDENTITY(1,1) NOT NULL,
[OrganisationName] [nvarchar](200) NOT NULL,
CONSTRAINT [PK_Organisation] PRIMARY KEY CLUSTERED 
(
[Id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF,    ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

OrganisationRelationshop表：

CREATE TABLE [dbo].[OrganisationRelationship](
[Id] [int] IDENTITY(1,1) NOT NULL,
[OrganisationId] [int] NOT NULL,
[RelatedOrganisationId] [int] NOT NULL,
[OrganisationRelationshipTypeId] [int] NOT NULL,
CONSTRAINT [PK_OrganisationRelationship] PRIMARY KEY CLUSTERED 
(
[Id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF,        ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

OrganisationRelationType表：

CREATE TABLE [dbo].[OrganisationRelationshipType](
[Id] [int] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_OrganisationRelationshipType] PRIMARY KEY CLUSTERED 
(
[Id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF,    ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

一切正常，但当我尝试删除关系时，fluent Nhibernate会尝试将该特定记录的CompanyId设置为null，而不是从CompanyRelationship表中删除该记录。下面是我可以在NHProf中看到的查询：

UPDATE CompanyRelationship
SET    CompanyId = null
WHERE  CompanyId = 3893 /* @p0 */
AND Id = 487 /* @p1 */

为了删除记录，我调用了RemoveRelatedCompany函数，该函数从relatedCompanies列表中删除特定的CompanyRelationship，然后调用Session.Save()和Session.Flush()来保存公司实体。

我在这里做错了什么，有什么想法是因为这个行为？

Answer 1

当我使用AutoMapping时，我必须覆盖组织的映射，如下所示来解决这个问题：

mapping.HasMany(c => c.RelatedOrganisations).Inverse().ForeignKeyCascadeOnDelete().Table("OrganisationRelationship")；

Answer 2

可能您必须在映射上设置.Cascade.AllDeleteOrphan()；(cascade=“all-delete- on”)。

此外，如果您发布您的映射将更容易回答您