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Posted to users@tapestry.apache.org by Pillar <so...@hotmail.com> on 2012/11/29 15:48:48 UTC
[5.3.6] Loop component giving coercion error
I've been reading other posts but nothing seems to work for me.
Here's my page:
public class ServiceActivation {
private List<User> users;
@Property
private UserService userservice;
@Property
private User u;
@Inject
private UserDao userDao;
public List<User> getUsers() {
if (users == null) {
users = userDao.findAll();
}
return users;
}
public void onSuccess(UserService userservice) {
System.out.println(userservice);
}
}
A user has a List<UserService> that gets loaded at userDao.findAll() along
with the User. I have a form that I want to loop through all the users and
give them an option to 'activate' a service, contained in the userservice
object. I'm just posting the nested loops because I can't format the whole
thing nicely, but it's within a form and there is a sbumit button for each
nested iteration:
<t:loop source = "users" value = "u" formState = "none">
<t:loop source = "${u.userServices}" value = "userservice" formState =
"none">
</t:loop>
</t:loop>
Inside both loops I try to access properties of u and userservice.
I get this error message:
Render queue error in BeginRender[service/Activation:loop_0]: Failure
writing parameter 'value' of component service/Activation:loop_0: Could not
find a coercion from type java.lang.String to type
org.synchronica.example.entities.userservice.UserService.
I've read that formState = "none" does something in this case but I don't
understand it. There's also the ValueEncoder I don't understand, but I don't
want to make a database call for each item in the list (if that's the way to
implement it).
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Re: [5.3.6] Loop component giving coercion error
Posted by Pillar <so...@hotmail.com>.
I need sleep. Thanks!
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Re: [5.3.6] Loop component giving coercion error
Posted by Thiago H de Paula Figueiredo <th...@gmail.com>.
On Thu, 29 Nov 2012 15:40:32 -0200, Pillar <so...@hotmail.com> wrote:
> Hey
Hi!
> Can you tell me why this isn't working?
>
> <t:loop source = "services" values = "service" formState = "none">
> ${service.name}
> </t:loop
The parameter name is wrong: it's "value", not "values".
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Re: [5.3.6] Loop component giving coercion error
Posted by Pillar <so...@hotmail.com>.
Hey
So it worked as you said, but now I have another problem.
Can you tell me why this isn't working?
<t:loop source = "services" values = "service" formState = "none">
${service.name}
</t:loop
It gives me the following error:
Render queue error in Expansion[PropBinding[expansion
service/Activation(service.name)]]: Property 'service' (within property
expression 'service.name', of
org.synchronica.example.pages.service.ServiceActivation@29b65ab8) is null.
I have properties for both 'services' and 'service'. A service has a name
attribute with a getter.
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Re: [5.3.6] Loop component giving coercion error
Posted by Thiago H de Paula Figueiredo <th...@gmail.com>.
On Thu, 29 Nov 2012 12:48:48 -0200, Pillar <so...@hotmail.com> wrote:
> I've been reading other posts but nothing seems to work for me.
Hi!
> <t:loop source = "${u.userServices}" value = "userservice" formState
Never, never ever use ${} expansions when passing parameters. It causes
the value to be coerced to a String, and that's exactly what's causing
your problem. Just use source="u.userServices".
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Re: [5.3.6] Loop component giving coercion error
Posted by Pillar <so...@hotmail.com>.
Yes, that did it. God damn it's been bugging me for two hours trying to find
solutions. I think I had switched it because something had previously caused
an exception and I thought I needed the expansion. Can you explain the use
of formState and encoder in the form component? I don't quite get the docs.
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Re: [5.3.6] Loop component giving coercion error
Posted by Mauricio Aldazosa <ma...@gmail.com>.
On Thu, Nov 29, 2012 at 8:48 AM, Pillar <so...@hotmail.com> wrote:
> I've been reading other posts but nothing seems to work for me.
>
>
> <t:loop source = "users" value = "u" formState = "none">
> <t:loop source = "${u.userServices}" value = "userservice" formState =
> "none">
> </t:loop>
> </t:loop>
>
> Inside both loops I try to access properties of u and userservice.
>
>
>From what I can tell, the source of the inner loop shouldn't be using an
expansion. Write it as:
<t:loop source = "u.userServices" value = "userservice" formState ="none">
Take a look at: http://tapestry.apache.org/component-templates.html, there
is a warning there in the "Expansions" section that covers the problem you
are seeing.