Hi all,
I want to replace a collection from child with a new one. I try this code without sucess.
Any suggest are welcome.

_parents = _session.CreateCriteria(typeof(Parent)).List<Parent>();
foreach(Parent p in _parents) {
p.Children.Clear();
}

Child c = new Child();
c.Value = 500;

// add a child with a value of 500 to each parent

foreach(Parent p in _parents) {
_session.Transaction.Begin();
p.AddChild(c);
_session.Update(p);
_session.Transaction.Commit();
}


parent:
...
<bag name="Children" inverse="true" cascade="all-delete-orphan">
<key column="parent_id"/>
<one-to-many class="Child"/>
</bag>
...

child:
...
<many-to-one name="Parent" column="parent_id" />
...

Thanks in advance.

Since you have a bidirectional association, you also have to "null" the parent property in the childs.

Something like

Thanks, thats true and was useful but is not the solution to the problem.
The result remains wrong: I get a unique child record pointing to the last parent in the parents list.

The error was to add a unique instance of child to the collection.
The solution is create one instance for each iteration.

Child c = new Child(); // <---- wrong
c.Value = 500; // <----- wrong

// add a child with a value of 500 to each parent

foreach(Parent p in _parents) {
_session.Transaction.Begin();

Child c = new Child(); // <---- correct
c.Value = 500; // <----- correct

p.AddChild(c);
_session.Update(p);
_session.Transaction.Commit();
}


Thanks anyway,
Cheers

Yes, obviously ... but missed that, too ;-)

i'm not having a bidirectional relation between my parent (Condition) and child (ConditionWord) and i'm having problems deleting childs out of my IList<ConditionWord>

Adding is not an issue. if i add a ConditionWords to my list, it will be saved in the ConditionWord table.
I can also get them out of the database with getting the Condition. The ConditionWords will be filled in.

BUT if i try to clear the list (condition.Words.Clear()) it's telling me that the IList is Read-only, and i cannot delete anything. the IList is declared by NHibernate as an Array.

Any idea why that's happening? (using NHibernate 2.0)



Condition class (parent)






ConditionWord class (child)