[bv-dev] Nested message parameters and EL expressions

[Emmanuel Bernard]

That makes sense.
Can you open a BVAL issue to clarify the possibility in the spec and add
the relevent bits of this conversation?

On Mon 2013-11-18 16:31, Gunnar Morling wrote:
> I think the algorithm should cover for that case, even if we didn't plan
> for it.
> 
> In steps 1 - 4 only message parameters are resolved (against the resource
> bundles and then in step 4 against constraint attributes). Only in step 5
> the EL evaluation is performed. There is no loop back to parameter
> resolution after EL interpolation.
> 
> So considering the following example:
> 
>     @ThresholdMax(value=10, messageThreshold=50, message="${validatedValue
> > {messageThreshold} ? '{muchTooLarge.message}' :
> '{aBitTooLarge.message}'}")
>     int myInt = ...;
> 
> Then I'd say algorithm should transform the message like this:
> 
> After step 3 (resource bundle replacements): "${validatedValue >
> {messageThreshold} ? 'Viel zu groß' : 'Zu groß'}"
> After step 4 (resolution of constraint attributes): "${validatedValue > 50
> ? 'Viel zu groß' : 'Zu groß'}"
> After step 5 (EL evaluation): "Viel zu groß" or "Zu groß", depending on the
> threshold value
> 
> --Gunnar
> 
> 
> 
> 
> 2013/11/18 Emmanuel Bernard <emmanuel at hibernate.org>
> 
> > Depending how the spec is written it might already be too late but I
> > would definitely like something like that to happen.
> >
> > We just need to be careful, which interpolation should happen first or
> > if we want to do them in a loop until the system rests.
> >
> > On Mon 2013-11-18  9:32, Gunnar Morling wrote:
> > > Hi,
> > >
> > > I came across an interesting case in the HV user forum [1], where a user
> > is
> > > essentially nesting messages parameters within an EL expression:
> > >
> > >     ${validatedValue > someValue ? '{x.y.z.message}' : '{x.y.w.message}'}
> > >
> > > The expectation is that at first the two message parameters are resolved
> > > and then based on the conditional expression the outer EL expression
> > either
> > > resolves to one message or the other.
> > >
> > > This is currently not supported in HV, but reading the interpolation
> > > algorithm in the spec [2] I can't find anything indicating that this case
> > > would prohibited. On the other hand I'm not sure whether we intentionally
> > > meant to support it (at least it never occurred to me); if so, I think we
> > > should provide an example for this in the spec.
> > >
> > > The use case seems valid to me, also for cases where one wants to refer
> > to
> > > constraint attributes in conditional logic. Any thoughts?
> > >
> > > --Gunnar
> > >
> > > [1] https://forum.hibernate.org/viewtopic.php?f=9&t=1029782
> > > [2] http://beanvalidation.org/1.1/spec/#default-resolution-algorithm
> >
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> >
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