- Prisma: Zone (postal-code list or radius), Rate (zone- or distance-band
keyed), GeocodeCache (permanent address->lat/lng cache per
IMPLEMENTATION_PLAN.md §9), Location.shopifyLocationId (maps to
Shopify's own Location resource for inventory checks), Booking.zoneId
(needed for per-zone delivery-density counts, not just per-location).
- app/lib/geo.ts: pure haversine distance + postal-code matching, unit
tested against known city-to-city distances.
- app/services/zones.server.ts: geocoding (Google Maps Geocoding API,
cached — never re-geocodes the same address twice), zone eligibility,
nearest-location auto-assignment ranked by distance, delivery-density
threshold checks (a sparse zone doesn't unlock until minOrders bookings
have already routed through it), and inventory-based location exclusion
via Shopify's InventoryLevel API (locations without a mapped
shopifyLocationId are left in rather than false-negative excluded).
- app/services/rates.server.ts: pure rate resolution by zone or distance
band, cheapest-match-wins when bands overlap.
- apps.scheduling.availability.tsx: LOCAL_DELIVERY requests with a
postalCode/address now auto-assign to the nearest eligible,
density-qualified zone/location instead of the shop's default location;
response includes the matched rate. Also fixed a real gap left over from
Phase 4: this route never actually read Booking counts into
getAvailability's `consumed` map, so capacity always showed as fully
available regardless of existing bookings — now it does.
- extensions/datetime-widget: LOCAL_DELIVERY now asks for a postal code
before showing dates; PICKUP shows a Google Maps pin for the location
(both gated on an optional Maps API key — a block setting in the theme
editor, since it needs to be public/client-side, not an app secret);
confirmation display and cart attributes (dd_zone_id, dd_rate_label)
carry the resolved zone/rate through to checkout.
- extensions/delivery-customization: now appends the resolved rate to the
relabeled delivery option ("Local delivery — Aug 25 ($5.99)") when one's
configured — real Cart Transform-based fee *charging* stays deferred to
v2 per IMPLEMENTATION_PLAN.md §5.4, this is display-only.
- Admin: /app/zones and /app/rates (Polaris CRUD, mirroring Phase 1's
patterns), plus shopifyLocationId and auto-geocode-on-save added to the
location edit form.
Fixed one real bug caught only by `npm run build` (not tsc/vitest, which
both passed clean): app.rates._index.tsx's component called
formatPriceLabel from rates.server.ts, and Remix correctly refuses to
bundle anything imported from a .server.ts path for the client. Moved the
pure (no I/O, no Prisma) formatter to app/lib/currency.ts.
Verified: lint, typecheck, 86 unit tests (+21 new: geo, zones, rates,
delivery-customization's rate-label case with a real WASM fixture run),
16 integration tests against live Postgres (+8 new: geocode caching,
postal/radius zone matching, nearest-first ranking, density thresholds),
both builds, and a live script exercising the full
zone-match -> density-check -> rate-resolve -> availability pipeline
together against the Postgres container.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
The core competitive moat (PRODUCT_STRATEGY.md §3.1): checkout can no
longer complete without a valid, still-available slot, on any Shopify
plan. User confirmed writing Functions in JS rather than Rust — no Rust
toolchain was available in this environment, and IMPLEMENTATION_PLAN.md §1
explicitly allows JS as a fallback ("Rust preferred, JS acceptable").
- app/services/holds.server.ts: Redis-backed soft slot-holds with TTL.
Hold creation is a Lua script (EVAL) — the "does this slot have room"
check and the reservation itself have to be one atomic Redis operation,
or two concurrent requests can both read "one spot left" and both
succeed. Outstanding holds per slot live in a sorted set scored by expiry
(so eviction is just ZREMRANGEBYSCORE, no separate expiry job needed to
read a correct count), and a repeat request from the same cart renews
its own hold instead of competing against the capacity gate again.
- app/routes/apps.scheduling.hold.tsx: public app-proxy endpoint the widget
calls the moment a shopper picks a slot — reserves capacity BEFORE the
cart attribute is written, since the attribute alone is just two
shoppers racing to write the same field.
- extensions/datetime-widget: now fetches the cart token, requests a hold
first, and only writes cart attributes on success; shows an error and
refreshes the slot list if it loses the race.
- app/services/booking.server.ts + webhooks.orders.create.tsx: converts an
order's dd_* cart attributes into a confirmed Booking (idempotent on
orderId — webhooks redeliver), releases the matching hold, and writes a
`delivery_datetime.booking` order metafield so the slot is visible on the
order record natively (IMPLEMENTATION_PLAN.md §5.2/§2). Deliberately does
NOT re-check capacity and reject at this point — by the time an order
exists, payment has happened; that's the Function's job, earlier.
- webhooks.orders.cancelled.tsx: marks the Booking cancelled, freeing its
capacity.
- extensions/validation-slot (Cart/Checkout Validation Function): blocks
checkout when the cart's dd_* attributes are missing or incomplete — a
shopper who bypasses the widget entirely (clears the attribute, calls the
cart API directly) still cannot check out, because this runs inside
Shopify's own checkout, not the browser. Scope note documented in
evaluate.js: this doesn't yet re-validate against a live capacity
snapshot at the moment checkout completes ("has since been taken" in
§3.1) — Functions can't call our DB, and a metafield-snapshot refresh
pipeline for that is unscoped work; the 10-minute hold TTL is the interim
mitigation for that specific race.
- extensions/delivery-customization: relabels every delivery option to the
shopper's actual chosen method + date ("Pickup — Aug 25" instead of a
generic carrier label), directly fixing the "estimated delivery date on a
pickup order" complaint §3.1 names. payment-customization is deliberately
NOT built yet — there's no configurable payment-method rule for it to
enforce until later phases add one; shipping a no-op Function serves
nothing.
- Prisma: added Booking (no SlotHold table — Redis is the sole source of
truth for holds, per §4's own "(Redis-backed)" annotation; mirroring it
into Postgres would just be a sync-consistency burden with no benefit).
- Both Function extensions are hand-scaffolded from Shopify's documented
JS Function structure (same interactive-login limitation as the Theme
App Extension) — README.md flags that `shopify app function schema`
should be run before deploying to confirm the input queries still match
the live schema.
New tests/integration/ suite (separate vitest config, needs live
Redis+Postgres — `docker compose up -d` locally, a services: block in CI)
holds the tests that can't be meaningfully mocked: the slot-hold
concurrency test CLAUDE.md calls out as non-negotiable (20 concurrent
requests for 1 unit of capacity → exactly 1 succeeds; 30 for 5 → exactly 5;
release-then-retry; TTL expiry; same-cart renewal) and the full
hold-to-booking lifecycle including idempotency on webhook redelivery.
Both Functions' pure decision logic is separately unit-tested (11 tests).
60 total tests now pass (52 unit + 8 integration).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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