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
>>
>>
>>
>>
>
>
>
>
This archive was generated by hypermail 2.0.0 : Wed Jan 04 2006 - 16:52:56 EST