EntityProxyId

[Patrick Julien]

It's not very clear to me how EntityProxyId helps us achieve very
simple scenarios.

How do you use this thing when you have pre and post operations to do
in an activity?

If I have an edit scenario, let's say a user with a list of phones,
normally, I would follow something like this:

1. Set the record in the activity
2. Start the activity
3. In start, get the id of the user and list the phones
4. When I receive the phone, I show the display of the edit activity

I don't see how this is done anymore with EntityProxyId. How do I get
my phone numbers? On the client side, the only member EntityProxyId
has is getClass(), what I'm a suppose to give to the server to find my
phone numbers?

It's the same problem if you want to do something post save. If I
want to save the phones of a newly created user, I would do:

1. Exit is called from AbstractProxyEditActivity
2. Save the user
3. Get the id of the newly created user
4. Attach the phone numbers to the newly created user

Again, here, with EntityProxyId, I have no idea how you do this anymore.

I don't mean to complain here but seriously how do you use this thing?
It's so opaque that I can't do anything with it

[Ray Ryan]

On Tue, Sep 28, 2010 at 10:13 AM, Patrick Julien <pju...@gmail.com> wrote:

It's not very clear to me how EntityProxyId helps us achieve very
simple scenarios.

How do you use this thing when you have pre and post operations to do
in an activity?

If I have an edit scenario, let's say a user with a list of phones,
normally, I would follow something like this:

1. Set the record in the activity
2. Start the activity
3. In start, get the id of the user and list the phones
4. When I receive the phone, I show the display of the edit activity

I don't see how this is done anymore with EntityProxyId.  How do I get
my phone numbers?  On the client side, the only member EntityProxyId
has is getClass(), what I'm a suppose to give to the server to find my
phone numbers?

There is nothing stopping you from making your real ID part of your public API. We no longer force you to expose getId on the client, but you're still allowed to. 

 

It's the same problem if you want to do something post save.  If I
want to save the phones of a newly created user, I would do:

1. Exit is called from AbstractProxyEditActivity
2. Save the user
3. Get the id of the newly created user
4. Attach the phone numbers to the newly created user

Again, here, with EntityProxyId, I have no idea how you do this anymore.

I don't mean to complain here but seriously how do you use this thing?
 It's so opaque that I can't do anything with it

If your persist method returns the newly saved entity, that's the simplest way. If it doesn't, listen for create events and compare the EPId of the created item with that of the proxy you got from RequestFactory#create(). They will be equal if the one in the createEvent is the result of the persist of the create()d proxy.

--
http://groups.google.com/group/Google-Web-Toolkit-Contributors

[Ray Ryan]

Also note RequestFactory#find(EntityProxyId)