Two people shaping one drive were each editing their own copy: a via dragged on
one screen reached the other only on the next reload, and the route it changed
looked settled until then. Every write in the domain now announces itself over
the websocket the rest of the trip already uses — the five REST routes and the
matching MCP tools alike, so an assistant moving a stop is as visible as a
person doing it.
Two new trip-scoped events carry it: roadtripVia:changed with the day's whole
via list, and roadtripTrack:changed. The whole list rather than a delta, because
a via is identified by its position in a chain and a delta protocol would need
an ordering guarantee to be worth anything.
The originating socket is excluded through the X-Socket-Id header the other
domains already forward, so nobody watches their own change arrive twice.
Dragging a via somewhere else on the map changed where the point IS and never where it
sits in the chain. The anchor that decides which two stops it is threaded between was
worked out once, when the point was dropped, and the drag sent only coordinates —
`roadtripViaUpdateRequestSchema` carried a lat and a lng and nothing else.
So a via pulled past the stop it used to precede kept claiming the earlier leg. The
router then drove out to it and turned back before carrying on, which on screen is not a
subtly wrong route: it is a spur that reads as the drag having done nothing at all, with
the original road still sitting there unchanged.
The anchor is not a property of the point but of where the point sits along the drive, so
it is recomputed on a drag the same way it is on a drop. The projection that did that was
inline in addRoadtripVia; it moves to a shared `anchorFor` and both callers use it.
A drag differs from a drop in two ways, both deliberate. It measures against its OWN day:
letting the nearest day win, which is right for a click on open map, would hand the via to
a neighbouring day whose road happens to pass closer and make it disappear from the day it
was dragged in. And it has no 2 km guard: pulling a via well off the current road is
exactly what the gesture is for, and the anchor only says which leg gets bent.
`after_order_index` is optional on the way in, so a drag inside one leg and an older
client still send just the coordinates, and the stored pin is then left alone rather
than cleared.
The domain arrived with 557 lines, a service test, and nothing else. No
controller test, no e2e, and no MCP test — so the guard chain, the trip scoping
on every route, the cross-trip track check and the day_edit parity were all
unasserted, and the whole domain sat in the 80 catch-all where it could shed
twenty points against the headroom of the domains beside it.
The e2e is the one that earns its place. `@RequireAddon` is metadata and does
nothing on its own, and AddonGuard is not global, so the ordering the
controller's own comment calls load-bearing is exactly the kind of thing a later
change removes without noticing — it had already happened once. Deleting the
guard now turns three cases red, which I checked by deleting it.
The MCP tools had never executed at all: the shared harness seeds the addon
disabled, so `when: roadtripAddonOn` kept all five from attaching. They now run
against the same checks the REST routes make, including the demo account and a
member without day_edit, because the repo requires the two surfaces to move
together.
Two client modules that had no test get one: the overlay builder, where two
decisions live that are not cosmetic — which offered road is drawn as the one you
are on, and that a label hangs where its own route is unlike every other, rather
than at a midpoint that can fall on a stretch two routes share — and the service
marker, where the thing worth pinning is that an ordinary place gets nothing
back, and that the anchor arithmetic includes the border.
The domain carries its own coverage floor now instead of hiding in the catch-all.
Pinned under the measured figure on purpose; the exact ratchet gets regenerated
with the repo's own script after a full run.
Along the way, roadtrip_vias and roadtrip_day_tracks join the reset list every
other domain's tables are on. Without that a via written by one case was still
there for the next one, which is how the first version of the MCP suite passed
an assertion it should have failed.
Maurice