[jira] Commented: (MYFACES-1048) t:dataTable preserveModel has no option to refresh model before render

["Martin Marinschek (JIRA)" <de...@myfaces.apache.org>]

    [ http://issues.apache.org/jira/browse/MYFACES-1048?page=comments#action_12363561 ] 

Martin Marinschek commented on MYFACES-1048:
--------------------------------------------

Don't think so.

See this code:

    public void encodeBegin(FacesContext context) throws IOException
    {
        if (!isRendered())
            return;

        if (_isValidChildren && !hasErrorMessages(context))
        {
            _preservedDataModel = null;
        }

> t:dataTable preserveModel has no option to refresh model before render
> ----------------------------------------------------------------------
>
>          Key: MYFACES-1048
>          URL: http://issues.apache.org/jira/browse/MYFACES-1048
>      Project: MyFaces
>         Type: Improvement
>     Reporter: Simon Kitching

>
> Currently, t:dataTable's preserveDataModel "permanently" preserves the model. This nicely ensures that the contents of the datamodel used at render time is the same at the following validation phase - critical for correct behaviour.
> However it *keeps* the same data through to the next render phase too. This means that once a dataTable is initialised with data,
> it never changes (the data gets "stale"). It would be nice to have an extra option for the data to be preserved between render and
> postback, but then discarded before the next render so that fresh (non-stale) data can be fetched. 
> In other words, the problem is that without preserveDataModel, dataTable has two fetches: at validate then at render.
> The preserveDataModel reduces this to zero fetches. However having *one* fetch [before each render phase but not before validate phase) is also useful.

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