Personally I don't think so. What about PI for transient entities? I think this 
should be a domain concern.

Or am I missing how you think this should be solved on newly created entities?

/Roger

From: [email protected] [mailto:[email protected]] On Behalf Of 
Fabio Maulo
Sent: den 3 juni 2010 14:19
To: [email protected]
Subject: Re: [nhusers] Beginners question: How to add or delete related entity

Roger...
Perhaps we should implements a custom ParentChildSet and ParentChildBag 
somewhere ?
What do you think ?
On Thu, Jun 3, 2010 at 8:34 AM, Roger Kratz 
<[email protected]<mailto:[email protected]>> wrote:
Don't expose the mutable collection. Instead have something like...

department.AddUnit(new Unit());
department.RemoveUnit(someUnit);

...and handle the birefs inside these methods.

-----Original Message-----
From: [email protected]<mailto:[email protected]> 
[mailto:[email protected]<mailto:[email protected]>] On Behalf Of 
Skiv
Sent: den 3 juni 2010 10:17
To: nhusers
Subject: [nhusers] Beginners question: How to add or delete related entity

For example, I have entity with one to many relation: Department has
many Units:

class Department
{
public decimal Id{get;set;}
public IList<Unit> Units{get;set;}
}

class Unit
{
public decimal Id{get;set;}
public Department {get;set;}//Parent
}

If I want add new Unit:
Unit newUnit =new Unit{Department=someDepartment};
session.Save(newUnit);

So, if I already have parent Department, it's Units collection isn't
updated automatically, I must add it manually:
someDepartment.Units.Add(newUnit);

Same is with entity deletion:
Unit deletedUnit = someDepartment.Units[0];
session.Delete(deletedUnit);
deletedUnit.Department.Units.Delete(deletedUnit);

Is this ok? Maybe there is more convenient way to do this?

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