I'm struggling with mappings that uses a junction table that references the same table. The idea is to be able to track all links between the pages.
Junction table:
CREATE TABLE WikiPageLinks (
Page int NOT NULL,
LinkedPage int NOT NULL
)
Main table:
CREATE TABLE WikiPages (
Id int NOT NULL IDENTITY,
PageName nvarchar(50) NOT NULL,
Title nvarchar(50) NOT NULL,
CONSTRAINT PK_WikiPages PRIMARY KEY (Id)
)
And class:
public class WikiPage
{
public virtual int Id { get; protected set; }
public virtual IEnumerable<WikiPageLink> BackReferences {get;}
public virtual IEnumerable<WikiPageLink> References {get; }
}
WikiPageLinks .LinkedPage
WikiPageLinks.Page
How should the mapping look like?
if there are no additional columns in the link then i would cut it out
public class WikiPage
{
public virtual int Id { get; protected set; }
public virtual IEnumerable<WikiPage> BackReferences { get; }
public virtual IEnumerable<WikiPage> References { get; }
}
// WikiPageMap : ClassMap<WikiPage>
public WikiPageMap()
{
...
HasManyToMany(wp => wp.References)
.Table("WikiPageLinks")
.ParentKeyColumn("parent_page_id")
.ChildKeyColumn("referenced_page_id");
HasManyToMany(wp => wp.BackReferences)
.Table("WikiPageLinks")
.ParentKeyColumn("referenced_page_id")
.ChildKeyColumn("parent_page_id")
.Inverse();
...
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.