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Chapter

08 · Entity-First Feature Design

One folder = one entity. Logic lives with the entity, routes are UX-only.

Mental Model

  • Entity folder is a mini-repo: actions, components, context, types, lib.
  • Routes can move; entity internals stay portable and self-contained.

Canonical Structure

app/(index)/projects/

  actions/

  components/

  context/

  lib/

  types/

  page.tsx

  layout.tsx

  index.ts

Portability Rules

  • No cross-entity imports; expose a barrel if needed.
  • No hard-coded routes in internals; routes are UX concerns.
  • Public surface = actions + types; keep UI assumptions out.

Never Do

  • Nested routes dictating logic placement.
  • Shared state between entities; communicate via IDs/calls.
  • Cross-entity Prisma access; keep boundaries strict.