Hold on - t:dataTable refetches the data before rendering, right? regards,
Martin On 1/22/06, Simon Kitching <[EMAIL PROTECTED]> wrote: > On Fri, 2006-01-20 at 14:26 +0100, Mathias Stein wrote: > > > The data list used during validation phase *must* be the same as the one > > > used during the previous rendering phase, otherwise as you note the > > > wrong object can be accessed. > > > > As fas as I know the view is serialized, stored in the session and > > deserialized on request submition. > > Why doesn't dataTable simply store the data model or at least the row > > bindings automatically? > > DataTable doesn't store the data model because > (a) > There is no guarantee that the data model is serializable. It's a > user-provided object. And in addition, serializing/deserializing is not > always the same as keeping the original object in the http session; an > example is Hibernate entities, where serialize/deserialize results in > the objects becoming "detached". > (b) > Storing it could make the saved state *much* larger. Ok, sometimes it's > necessary but the code shouldn't default to doing this.. > (c) > It's consistent with the behaviour for other objects. An h:inputText > component for example will call its property getter during the validate > phase to determine whether the newly submitted value is different from > the model value (ie whether a ValueChangeEvent should be queued). > > The t:dataTable does have attribute "preserveDataModel" which does > preserve the data model. However it keeps the data for *too* long (ie > doesn't refetch before render). Maybe t:dataTable should have another > variant that preserves data from render to postback, but then clears > it? > > > This concurrency issue seems to me like a standard problem of all table > > based web applications. > > Yes it is. > > > Is this a problem with the specification or with the implementations? > > By the way, myfaces and Suns RI show exacly the same behavior. > > The refetch is behaviour required by the spec. > > Regards, > > Simon > > -- http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces
