Re: [Springframework-developer] Web Flow - Complex StateTransitions

[Will B. <wil...@ra...>]

I am now trying the "forward:..." approach, but when doing a forward to
another top level flow, the flowId of the original flow is still in the
request parameters. This causes an error in the
HttpServletFlowExecutionManager, since the flowId is for the first top
level flow... What can I do about that?

Thanks,

Will

> > The Save (create and continue editing) button brings up another
> > interesting issue... Because we have defined each of our CRUD operations
> > in a separate web flow, we really want to forward directly to our edit
> > web flow after creating (we don't want to nest a subflow). While this is
> > possible using end state and a view (forward:...), it isn't possible to
> > send any request attributes along to the edit flow. Therefore, it is not
> > possible to send the primary key of the domain object that we wish to
> > edit.
> 
> Actually, that is possible. All data in the request scope will be put in the
> request attributes by Spring MVC, even when forwarding to another top-level
> flow using "forward:...". The only little snag is that the top level flow 
> will have
> to obtain the domain object id from the request attributes, while it is 
> typically
> in the request parameters or flow scope (e.g. when mapped in).
> If you want to reuse your flows both stand-alone, as a subflow, or as a flow
> triggered via a forward, the easiest solution is to have an "input parameter 
> setup"
> action at the start of the flow. This action will do some logic like this:
> 
> if (id in flow scope) {
>     success
> }
> else if (id in request attributes) {
>     take from request attributes and put in flow scope
>     success
> }
> else if (id in request parameters) {
>     take from request parameters and put in flow scope
>     success
> }
> error