David,
What does your model look like? Is it something like:
Routing <-------->> RoutingStep
With a relationship from Routing to RoutingStep named routingSteps.
Guessing here, but I suppose you have a form for entering information
on an instance of Route:
Now your are trying to update an attribute of RoutingStep with a
binding like:
currentRoute.routingSteps.someAttribute
If my guess is correct, well you can't do that because
"currentRoute.routingSteps" would return "null" if there are no
routing steps. I'm making this assumption because I've seen
beginners to WO try this.
There are a few options for dealing with this case. But most would
include creating an interface to display the array of routingSteps
and actions to add and remove routing steps from the array. You also
need to properly manage the to-many relationship when adding and
removing. Generally using addObjectToBothSidesOfRelationshipWithKey.
Once you are able to iterate over your routingSteps relationship then
you can bind your form controls to "currentRoutingStep" or whatever
you decide to call the iterator reference.
On Apr 3, 2007, at 3:39 PM, David Avendasora wrote:
Okay, it isn't a nesting problem on the web-component side of
things. I think it is a problem with how I'm stepping through the
objects to update them. Simple attributes and to-one relationships
are easy, to-many relationship updates have me stumped.
Can anyone give me an example of how to iterate through the related
objects and update them with the values submitted in the form?
Thanks,
Dave
On Apr 3, 2007, at 2:19 PM, Chuck Hill wrote:
On Apr 3, 2007, at 12:12 PM, David Avendasora wrote:
Okay, I have one form on the page. One submit button in the form.
It will update the attributes of "Routing" (the top level
component) but as soon as I try to update attributes of
destination of the to-many relationship (RoutingStep) I get a
java.lang.NullPointerException. The object that it is finding to
be null is the aRoutingStep object that is the "item" binding of
the WORepetition. The "list" binding of the WORepetition is
aRouting.routingSteps.
Am I missing something?
A nesting problem?
<webobject name="Repetition">
....
<!-- here the value of the item binding of Repetition is
guaranteed to have a valid value --:>
...
</webobject name="Repetition">
<!-- here the value of the item binding of Repetition is
guaranteed to be null --:>
Chuck
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