The 'volatile' attribute only applies to iterated form elements, so the
DataSqueezer implementation is essential for other uses of <For>.
Unfortunately I can only find documentation for v3.0. If anyone has
successfully implemented squeezers in Tapestry 4 and can explain to a
newbie, I'd be delighted to hear.
> -----Original Message-----
> From: Robert Zeigler [mailto:robert..uregumption.com]
> Sent: 04 January 2006 21:55
> To: cayenne-use..bjectstyle.org
> Subject: Re: Note to Cayenne/Tapestry users ...
>
> For, in fact, calls into the data squeezing mechanisms.
> So, if you've got a data squeezer registerred which handles
> cayenne data objects, then it'll be used to construct the
> stored string as well as to "re-inflate" the objects when For rewinds.
> So, in my CayenneDataObjectSqueezeAdapter implementation, I
> "serialize"
> to a pk (with some bits of necessary extra information), and
> then when unsqueezing, use DataObjectUtils to refetch the object.
>
> Robert
>
> Gentry, Michael (Contractor) wrote:
>
> >I thought the data squeezer just put the object's PK in the
> hidden area
> >of the form?
> >
> >/dev/mrg
> >
> >
> >-----Original Message-----
> >From: Robert Zeigler [mailto:robert..uregumption.com]
> >Sent: Wednesday, January 04, 2006 4:43 PM
> >To: cayenne-use..bjectstyle.org
> >Subject: Re: Note to Cayenne/Tapestry users ...
> >
> >
> >That's where the data squeezer comes in handy; it will let
> For work its
> >magic (useful for avoiding stale link exceptions, etc.) and
> still make
> >sure you have objects which are nicely attached to the data
> context. :)
> >I've been using base:For (For, but for tapestry 3.03) for
> some time now
> >in conjunction with data squeezers and have no issues.
> >
> >Robert
> >
> >Michael Gentry (Yes, I'm a Contractor) wrote:
> >
> >
> >
> >>I've been converting an application which uses Tapestry
> 3/Cayenne to
> >>Tapestry 4 (and Cayenne, of course). In the process, I've
> been trying
> >>
> >>
> >to
> >
> >
> >>get rid of all of the deprecated components (ActionLink,
> Conditional,
> >>Foreach, etc).
> >>
> >>I replaced one of the Foreach components with the new For component
> >>and
> >>
> >>
> >it
> >
> >
> >>caused issues for me. I had a persistent List of Cayenne
> objects and
> >>Tapestry, with the new For component, would
> serialize/deserialize them
> >>(apparently in the HTML), which creates a HOLLOW Cayenne object
> >>disassociated from it's DataContext. (It also produced some bizarre
> >>
> >>
> >HTML in
> >
> >
> >>the hidden INPUT section -- kept repeating a For_0
> variable, but with
> >>different values.) This, of course, caused the code to fail.
> >>
> >>After looking through the docs, we added the
> volatile="true" attribute
> >>
> >>
> >and
> >
> >
> >>it made For work more like the old Foreach and everything was fine
> >>
> >>
> >again.
> >
> >
> >>Just thought I'd share in case other Cayenne/Tapestry users
> are going
> >>through a similar conversion.
> >>
> >>/dev/mrg
> >>
> >>
> >>
> >>
> >
> >
> >
> >
>
>
>
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