Hello everyone,
while trying out some of the very cool new features in Wicket 8,
specifically replacing PropertyModels with lambda expressions, I had a few
questions coming up. Most of them have been answered by the great guide
provided, but following things are still a bit unclear to me:
1) Read-Only Models
Let's say I want to replace the following PropertyModel for showing the
"name" property of a Person obejct in a Label
new PropertyModel<String>(personModel, "name");
with a lambda expression. Which of the following would be the best approach
and why?
LambdaModel.of(personModel, Person::getName);
personModel.map(Person::getName);
personModel.flatMap(...); // not quite sure yet when to use this one. See
next question as well
The first two options seem to be identical at the first glance but I noticed
that the LambdaModel does call detach() on the underlying base model (just
like the PropertyModel does), whereas the model created by the map() method
doesn't seem to do that.
2) Readable/Writeable Models
The documentation has the following example for mapping a model to a
readable/writeable model of a property
IModel<String> personNameModel = personModel.flatMap(targetPerson ->
LambdaModel.of(
() -> targetPerson::getName, targetPerson::setName
));
Why is the call to flatMap() needed? Isn't just using the LambdaModel the
same but shorter?
IModel<String> personNameModel = LambdaModel.of(personModel,
Person::getName, Person::setName);
3) Constants in Models
In some cases I need to set a static constant value as read only model in a
component. Up until now I simply used
Model.of(Constants.MY_STATIC_VALUE);
which probably results in the value being serialised into the session of the
user.
Am I assuming correctly, that using following lambda expression as model is
more "efficient", since the static constant isn't serialised anymore this
way?
() -> Constants.MY_STATIC_VALUE;
Thanks to everybody pouring so much time into developing Wicket!
Daniel Radünz
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