# resolveFastApiRoutes

**Kind:** Function

**Source:** [`atloria-monorepo/libs/parser-core/src/techdocs/cross-file-routes.ts`](https://github.com/sherkety/atloria/blob/main/atloria-monorepo/libs/parser-core/src/techdocs/cross-file-routes.ts#L1042)

Give every FastAPI endpoint the URL the application actually serves it at.

FastAPI builds a path from three pieces that are conventionally in three files: the decorator
(`@router.get("/{id}")`), the router's own prefix (`APIRouter(prefix="/api_keys")`), and the
mount — `app.include_router(api_v1_router, prefix="/v1")` in main.py, where `api_v1_router`
is itself a router that included this one. Only the first two are in the endpoint's own file,
so a per-file parser publishes a suffix and calls it a URL.

Walks down from each `FastAPI()` application through the `include_router` graph, resolving
each mount's source through the mounting file's imports, and writes the accumulated path.

An endpoint the walk never reaches is one the application does not serve. Where the parse
contains the wiring — an app that mounts routers — such an endpoint is marked
`pathUnresolved` rather than left advertising a path that answers nothing. Where the parse
contains no wiring at all (a routers-only directory), nothing is touched: the local path is
then the best true statement available.

## Signature

```ts
function resolveFastApiRoutes(entities: Entity[]): number
```

## Parameters

| Name | Type |
|---|---|
| `entities` | `Entity[]` |

**Returns:** `number`