Accepts a Phoenix router module and returns paths that point to a controller with operations defined for its actions.

Options

• :filter - A predicate function to limit routes defined in your OpenAPI specification. This predicate is not called for every route, only on routes that define an operation.
• :unprefix - A string to remove from the beginning of the paths keys. Useful if your server path already contains a prefix like "/api/v1". In the OpenAPI Specification, paths are always relative to the server path, even when starting with "/".

Same as from_router/2 but directly accepts the return value of router_module.__routes__().