설정을 저장하고 실패에서 돌아오기

Repository Boundary

Edit and save preferences without losing later input or leaving with unsaved work. This is a consumer interaction composition in Design Engineering. Spatial structure comes from SaaS Settings; this recipe adds no reusable Layout behavior.

Reusable Method

Selected Pattern Stack

draft/baseline, submitted snapshot, single flight, unsaved navigation.

Ownership And Event Flow

The form owns draft; the server owns persisted data; the save attempt owns the snapshot; the router owns pending departure. Dirty is derived. Account changes invalidate the entire form generation.

Edit → validate → capture snapshot → save → reconcile acknowledgement → re-evaluate dirty. For Save-and-leave, leave only after successful reconciliation and only if no newer edits remain.

Composition And Substitution

Explicit-save semantics require the snapshot and draft separation. A single-flight guard can share or ignore repeats; queuing requires a separately defined sequence of snapshots. Immediate autosave is a different recipe with debounce, ordering, and conflict rules.

Acceptance Sequences

Sequence	Expected outcome
Submit A, edit B, acknowledge A	Baseline A; draft B remains dirty; stay if leaving was requested
Save fails, then retry	Preserve draft and release the operation guard
Remote revision conflict	Preserve draft; offer reload/merge under consumer policy
Cancel departure	Keep draft and return focus to the invoker

Opinionated Guidance

Keep the ownership boundaries visible when composing the patterns. One screen can combine these mechanisms without making every value global. Record the rejected alternative and its user-visible cost in the state brief.

Platform-Specific Guidance

The form must connect errors to fields and announce completion without implying newer edits were saved. A disabled submit control is not the duplicate guard.

Unsupported Absolutes

These acceptance sequences are proposed integration checks, not captured product evidence. Pattern model tests do not prove this entire screen, its backend, or its focus behavior.

Verification Contract

Adapt every acceptance row to the consumer and record actual results with the verification matrix. Include the ordinary successful task and at least one interrupted task. The initial handoff is consumer_reference: not_applicable because this fictional recipe selects no consumer profile or conformance record.

Source, License, And Attribution

Locally authored synthesis and examples. No upstream implementation is copied. These experimental contracts describe consumer-owned behavior; review when a failure, ownership change, or platform change invalidates an assumption.

IA Navigation

Parent: State Management. Next: Continue the state management route.