Many-to-Many (Same Object)

Developer Express Inc. » dotNET Business Application Frameworks » eXpressPersistent Objects » Many-to-Many (Same Object)

Last post 11/6/2008 10:17 AM by csom. 3 replies.

Page 1 of 1 (4 items)
	Sort Posts: Previous Next

10/30/2008 1:04 PM

csom
Joined on 5/10/2008
Switzerland
Posts 5

Many-to-Many (Same Object)

Reply Contact

Hello,

can someone tell me how I can etablish a many-to-many relationship to the same object? Is that possible?

I have a class called "Component" which has two properties (name, and components).

A component can contain other components and therefor a component can be included in other components (many-to-many).

I hope you understand what i try to do. Big Smile

Any help would be nice.

Thanks Claudio

10/30/2008 3:34 PM In reply to

Jim Clay
Joined on 1/14/2008
Sandpoint, ID
Posts 57

Re: Many-to-Many (Same Object)

Reply Contact

Here is a link to a KB that shows you how to implement self-referenced persistent objects:

http://www.devexpress.com/Support/Center/KB/p/K18072.aspx

It also talks about displaying them in a tree list if that is of any interest.

Jim

10/30/2008 9:26 PM In reply to

Robert Fuchs
Joined on 5/4/2007
Austria
Posts 802

Re: Many-to-Many (Same Object)

Answer

Reply Contact

> http://www.devexpress.com/Support/Center/KB/p/K18072.aspx

This KB article talks about a 1:N relation while the OP asked for a M:N relation.

Try this:

public class Component : XPObject

{

public Component(Session session) : base(session) { }

private string _name;

public string Name

{

get { return _name; }

set { SetPropertyValue<string>("Name", ref _name, value); }

}

[Association("IsPartOf:Parts")]

public XPCollection<Component> IsPartOf

{

get { return GetCollection<Component>("IsPartOf"); }

}

[Association("IsPartOf:Parts")]

public XPCollection<Component> Parts

{

get { return GetCollection<Component>("Parts"); }

}

HTH, Robert

11/6/2008 10:17 AM In reply to

csom
Joined on 5/10/2008
Switzerland
Posts 5

Re: Many-to-Many (Same Object)

Reply Contact

Thank you Robert. That solved my problem.

Page 1 of 1 (4 items)