DevForce Community Forum : How to add to navigation property? (newbe q) http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2009 : How to add to navigation property? (newbe q) Fri, 10 Apr 2026 21:42:24 -700 Wed, 07 Oct 2009 14:05:47 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=1511 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ How to add to navigation property? (newbe q) : Well, you could do that, I suppose,... http://www.ideablade.com/forum/forum_posts.asp?TID=1511&PID=5596#5596 Author: GregD
Subject: 1511
Posted: 07-Oct-2009 at 2:05pm

Well, you could do that, I suppose, but I'm still puzzled as to the utility of eliminating the navigation property back to the parent.]]> Wed, 07 Oct 2009 14:05:47 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1511&PID=5596#5596 How to add to navigation property? (newbe q) : Hi Greg,Steps to reproduce:1.... http://www.ideablade.com/forum/forum_posts.asp?TID=1511&PID=5594#5594 Author: patrickdk
Subject: 1511
Posted: 07-Oct-2009 at 12:06pm

Hi Greg,

Steps to reproduce:
1. Create a database containing the two tables + relationship
2. Create EF model (from db)
3. edit xml, throw out navigationproperty Order from CSDL section (from entitytype orderdetails)
4. create model with devforce object mapper
5. execute code

Whether I add to EntityManager before or after results in the same error.

I can send you a sample project if desired.
]]> Wed, 07 Oct 2009 12:06:13 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1511&PID=5594#5594 How to add to navigation property? (newbe q) : Add the Order to the EntityManager... http://www.ideablade.com/forum/forum_posts.asp?TID=1511&PID=5593#5593 Author: GregD
Subject: 1511
Posted: 07-Oct-2009 at 10:46am

Add the Order to the EntityManager before attempting to add to its OrderDetails collection.

Incidentally, when I run your code the exception I get is an InvalidOperationException, with the (actually quite helpful) message:

    Entities cannot be added to a RelatedEntityList belonging to a detached entity.

Incidentally, it seems quite odd to have a one-way relationship Order->OrderDetails but no OrderDetail->Order.  How do you model it?
]]> Wed, 07 Oct 2009 10:46:26 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1511&PID=5593#5593 How to add to navigation property? (newbe q) : Hi, I'm new to Devforce,... http://www.ideablade.com/forum/forum_posts.asp?TID=1511&PID=5590#5590 Author: patrickdk
Subject: 1511
Posted: 07-Oct-2009 at 6:35am

Hi,

I'm new to Devforce, and trying to build my first app. What I'm trying is:

A domain model with two entities, Order and OrderDetail.
Order has an OrderDetails navigation property
OrderDetails does NOT have a navigation property to Order (I don't want all of my entities point to everything else)
 
My code looks like this:

var em = new DomainModel.DomainModelEntityManager(true);

var d = em.CreateEntity<DomainModel.OrderDetail>();
// set detail properties (...)
d.EntityAspect.AddToManager();
 
var o = em.CreateEntity<DomainModel.Order>();
// set order properties (...)
o.OrderDetails.Add(d);
o.EntityAspect.AddToManager();
 
em.SaveAsync(savedcallbackhandler, null);
 
I'm getting a NullReferenceException on o.OrderDetails.Add(d)
 
What am I doing wrong?
 
TIA,
 
Patrick
]]> Wed, 07 Oct 2009 06:35:17 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=1511&PID=5590#5590