Hi all,
I'm a bit concerned about onSelectionChanged event effectively binding
my model. Suppose my model is a LoadableDetachableModel that is loaded
from the repository every time. Normally (upon form submission)
nothing will be bound after successfully passing validation; then
additional logic will run inside a transactional service and a
rollback thrown if something goes wrong (take into account that I'm
using session-in-view). But if a property of my model object is bound
outside this controlled scenario, the change will be persisted upon
session correct finalization, even if the object is invalid. I
observed that during onSelectionChanged execution the changed property
is effectively bound, so how should I deal with this?
Here is an example with a simple User that has a sex property allowing
the usual two values, note how setSex is called during execution of
onSelectionChanged:
The ouput for onSelectionChanged
--------------------------------------------------
loadSexModel
getSex
setSex <------- here
getSex
selectionChanged
getSex
The user domain entity.
----------------------------------
public class User implements Serializable {
[...]
private String sex;
[...]
public String getSex() {
System.out.println("getSex");
return sex;
}
public void setSex(String sex) {
System.out.println("setSex");
this.sex = sex;
}
}
The sex choice.
----------------------
DropDownChoice sex = new DropDownChoice("sex", getSexModel()) {
protected void onSelectionChanged(Object newSelection) {
System.out.println("selectionChanged");
}
protected boolean wantOnSelectionChangedNotifications() {
return true;
}
};
The sex model.
---------------------
private IModel getSexModel() {
return new LoadableDetachableModel() {
protected Object load() {
System.out.println("loadSexModel");
return Arrays.asList("Masculine", "Feminine");
}
};
}
Cheers,
Carlos
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