RequestFactory: return persisted ID in proxy after successful persist()

[RyanD]

This might be better logged as a feature request, but I wanted to
check that I hadn't missed something first.

Given something like this:

PersonProxy person = context.create(PersonProxy.class);
person.setName(name);
context.persist().using(person).fire(..... etc.

In the call to:

onSuccess

person.getId() == null

Even though of course the persistence layer assigned it an ID.

Seems like it would be pretty useful to have GWT RF not necessarily
transmit every person property back to the client after a successful
persist, but certainly getting the ID back to the client would be
useful. For example, after the successful persist, let's say I want
to restfully navigate to a PersonPlace and use the person's new ID
(assigned by persistence layer) in the token?

As it is for that case, which will be pretty common in a rest style
CRUD app, I'd have to create a static method like:

createPerson(String name)

then return a PersonProxy. But that seems to defeat the purpose of
having context.persist() around for more complex objects where you
don't necessarily want to create a giant factory method.

Anything I missed, or should getting the persisted ID back to the
client be a feature request?

Thanks.

[Y2i]

EntityProxyChange.registerForProxyType(...) can be used to get the ID
of the persisted object.

The receiver's
EntityProxyChange.Handler<PersonProxy>.onProxyChange(EntityProxyChange<PersonProxy>
event) will be called.
event.getWriteOperation() should return PERSIST
event.getProxyId() should return the stable id of the proxy.

This should help with a restful navigation after a successful persist.

[Thomas Broyer]

On Wednesday, December 15, 2010 9:14:03 AM UTC+1, Y2i wrote:

EntityProxyChange.registerForProxyType(...) can be used to get the ID
of the persisted object.

The receiver's
EntityProxyChange.Handler<PersonProxy>.onProxyChange(EntityProxyChange<PersonProxy>
event) will be called.
event.getWriteOperation() should return PERSIST
event.getProxyId() should return the stable id of the proxy.

This should help with a restful navigation after a successful persist.

It returns the "stable id", which you already have with person.stableId().

[Thomas Broyer]

On Wednesday, December 15, 2010 6:14:10 AM UTC+1, RyanD wrote:

This might be better logged as a feature request, but I wanted to
check that I hadn't missed something first.

Given something like this:

PersonProxy person = context.create(PersonProxy.class);
person.setName(name);
context.persist().using(person).fire(..... etc.

In the call to:

onSuccess

person.getId() == null

Even though of course the persistence layer assigned it an ID.

Seems like it would be pretty useful to have GWT RF not necessarily
transmit every person property back to the client after a successful
persist, but certainly getting the ID back to the client would be
useful. For example, after the successful persist, let's say I want
to restfully navigate to a PersonPlace and use the person's new ID
(assigned by persistence layer) in the token?

Can't you have your persist() method return the ID, so you have it passed as argument to the onSuccess method?

[RyanD]

Of course! Thanks, Thomas. I keep forgetting that these aren't
"magical" methods, even persist(). Problem solved.

[Y2i]

> It returns the "stable id", which you already have with person.stableId().

May be you can use "stable id" to implement PersonPlace with the help
of RequestFactory.getHistoryToken(EntityProxyId<?> proxy) and
RequestFactory.getProxyId(String historyToken)?

[Jake Wharton]

Is this possible using the editors as well?

When you flush the driver you get a RequestContext whose fire() only accepts a Receiver<Void>.

[Ido]

Hi,
Did you find any solution for that?
I'm facing the same problem now in which I would like to have the
persisted object's ID just after editor's save action.

Thanks a lot,
Ido

[Y2i]

The flush returns whatever was passed to edit() so it can be cast back to the right type.  You can also keep the context that is passed to edit() in an activity and then simply re-use it.

[Ido]

Thanks a lot Y2i, it's working