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shelfmark/docs/dev/routes.md
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splitsec2 0a7e114681 docs(dev): new routes go in a register_<group>_routes module (#1622)
Nothing in the developer docs says where a new route goes, so the next
contributor adds it to `main.py` again. This writes down the convention
from Discussion #1536: a new route group gets its own
`register_<group>_routes` module under `shelfmark/core/`, and `main.py`
calls it once.

It is one paragraph on a new page, `docs/dev/routes.md`, with a line in
the developer index. It also says that a few older routes are still in
`main.py` and are being moved out one group at a time. The route moves
in that discussion will follow what this says, so this goes first.
2026-10-31 03:52:01 -06:00

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# Adding Routes
New API routes go in their own module under `shelfmark/core/`, named for the group (`stats_routes.py`, `settings_routes.py`), as a `register_<group>_routes(app, ...)` function that `main.py` calls once. Anything the routes need that lives in `main.py` or is shared with another group, such as `login_required`, the auth mode or the user database, is passed in as a parameter, so a route module never imports `main`. When a test patches one of those, pass a callable that is evaluated per request, the way `register_stats_routes` does. Helpers that belong to one group stay in its module. Please don't add `@app.route` handlers to `main.py` itself: two PRs that each add a route there land in the same stretch of the file and conflict, where two route modules only share the one register call. `shelfmark/core/stats_routes.py` is the smallest example to copy. A few older routes are still in `main.py` and are being moved out one group at a time, see [Discussion #1536](https://github.com/calibrain/shelfmark/discussions/1536).