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WW-5850 docs: design for declarative multi-step flows - #2130
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ScopedModelDrivenInterceptor and ScopedModelDriven stay unchanged, so existing users keep today's code path. Flow actions implement a new flow model interface instead of ScopedModelDriven. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Fixes WW-5850
Design document only, for discussion before implementation:
docs/superpowers/specs/2026-11-08-WW-5850-scoped-model-driven-flows-design.md.Summary
Struts has two mechanisms for keeping form state across several requests: the
scopeinterceptor andscopedModelDriven. Neither has a lifecycle. This design adds declarative multi-step flows, implemented by a new dedicatedflowinterceptor, as a full alternative toscopefor multi-page forms.ScopedModelDrivenInterceptorandScopedModelDrivenare left unchanged, so existing users keep today's code path.start/step/end) instruts.xmlor with a Convention annotation.ScopedModelDriven), so the two interceptors never act on the same action.startcreates a new model by default; an action can opt in to resuming an existing one per request via an*Awareinterface that receives the existing model.steporendwith no running flow redirects to the flow'sstart.endfinishes the flow only when the action ran and returned neitherinputnorerror, so a failed final validation keeps the user's data.flowpresent beforeparamsin the stack).flowis added todefaultStackand does nothing for actions that declare no flow.Rollout
ScopeInterceptorandscopedModelDrivenunchanged.ScopeInterceptorwith a migration note (separate ticket).ScopeInterceptor(separate ticket).Background: the "Is anyone using the scope interceptor?" thread on user@ (2026-10-09).
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