Have been digging around the dataContext and I saw this in the localObject
method
// TODO: Andrus, 1/24/2006 implement smart merge for modified
objects...
if (cachedObject != prototype
&& state != PersistenceState.MODIFIED
&& state != PersistenceState.DELETED) {
I believe this may be causing one of the problems below. If you call
localObject with a new object and a prototype then the checks above are true
and as a result this gets called further down the chain in the same method
descriptor.shallowMerge(prototype, cachedObject);
which sets all the relationships to faults and this breaks because the new
object is not committed.
Is this a bug? What is the real purpose of passing a prototype?
On 05/01/07, edward pedersson <[EMAIL PROTECTED]> wrote:
Hi
I am using the latest version of Cayenne with Tapestry 4.0.1.
I am having a bit of trouble using nested dataContexts. I would like the
user to be able to create a new object in a wizrd style application but have
the option to cancel half way through the stages.
I have tried a few different options and noe seem to work. In the first
instance I tried the nested datacontext like this:
AClass parent; //assume this exists and is in the threaded context
DataContext childContext = this.getDataContext().createChildContext() //
this.getDataContext() is the threaded context
AnotherClass newObject =
(AnotherClass)childContext.createAndRegisterNewObject(AnotherClass.class);
AClass localParentObject = (AClass)childContext.localObject(
parent.getObjectId(),null);
object.setParent(localParent);
//do other stuff here like set other properties
// now save to parent
childContext.commitChangesToParent();
For some reason I seem to get the parent having two children, not just the
one! I assume it is because the changes in the childContext are propagated
to the parent context so as a result the first setParent call adds the child
to the parent and on commit changes the child is added again to the parent.
So I tried to have separate dataContexts instead by doing this
DataContext anotherContext = DataContext.createDataContext()
AnotherClass newObject =
(AnotherClass)anotherContext.createAndRegisterNewObject(AnotherClass.class
);
AClass localParentObject = (AClass)anotherContext.localObject(
parent.getObjectId(),null);
object.setParent(localParent);
//do other stuff here like set other properties
// now save to parent
newObject = (AClass)this.getDataContext().localObject(
newObject.getObjectId(),null);
I get errors like Can't build a query for relationship '...' for temporary
id:
Does anyone knew what I am doing wrong?
many thanks for your help.
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