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Devin Zuczek
25 lines
1.5 KiB
SQL
25 lines
1.5 KiB
SQL
-- The client build a room instance is running, so matchmaking only ever puts players
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-- on the SAME build into one session. Two builds sharing a Photon room disagree about
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-- how the scene and its objects serialize, so a 2023 client and a 2025 one in the same
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-- instance is a broken room rather than a mixed one — and there is nothing to notice it
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-- by afterwards, since each side simply fails to see what the other spawned.
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--
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-- The value is the `rn.ver` claim of the token whose matchmake CREATED the instance
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-- (the match worker stamps it; see resolveRoomInstance), and the joinable-instance
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-- search filters on it. A room busy with players on another build therefore reads as
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-- empty and the joiner gets a fresh instance beside them.
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--
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-- Rows written before this column existed have no `$.gameVersion`, so `game_version`
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-- is NULL and they match no build at all. That is deliberate: an unknown build is not
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-- a build to place someone into, and an instance is only ever a live session — once it
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-- empties, deleteEmptyRoomInstances retires it and nothing is left carrying a NULL.
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--
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-- A virtual generated column like the rest of the table (the value lives in the `data`
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-- blob); no index — the search is already keyed on the indexed `room_id`.
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--
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-- Generated from packages/domain/src/room-instance-db.ts (ROOM_INSTANCE_SCHEMA_DDL) —
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-- keep in sync.
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ALTER TABLE room_instance
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ADD COLUMN game_version TEXT GENERATED ALWAYS AS (json_extract(data, '$.gameVersion')) VIRTUAL;
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