I'd like to set up a tagging system for an entity in order to get a many to many relationship How is it possible achieve this sort relationship in abp?
Using a tag entity, an article entity and between them...? should i create another entity like "artcicles_tags"? Must this middle entity be derived from "Entity<long>" as well? and the mapping configuration is by convention or i must mapping it manually? Could you give me some clues? some suggestion?
2 Answer(s)
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Have a look at Entity Framework.
You can pretty much use either. If you just want Many to Many relationship, thats possible by just creating your Entities the right way:
public class Article: Entity<long> { public long Id {get;set;} ... public virtual ICollection<Tag> Tags {get;set;} } public class Tag: Entity<long> { ... public virtual ICollection<Article> Articles {get;set;} }This should work. (EF creates your tables)
But if you want your relationship table to have additional fields (ie. CreationDate) you need to use FluentApi.
See this document for help: <a class="postlink" href="http://www.entityframeworktutorial.net/code-first/configure-many-to-many-relationship-in-code-first.aspx">http://www.entityframeworktutorial.net/ ... first.aspx</a>
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oh thanks a lot i did it quickly and easily
- Added the navigation properties
- Add-Migration
- Update-Database
and it's done, nice.
