resolve #12

src/functions/update-rating.ts

@@ -0,0 +1,13 @@
+import dayjs from 'dayjs';
+
+import { User } from '../models/entities/user';
+import { updateUser } from './users';
+import { MiUser } from './update-score';
+
+export const updateRating = async (user: User, miUser: MiUser): Promise<void> => {
+	const elapsedDays = dayjs().diff(dayjs(miUser.createdAt), 'd') + 1;
+	await updateUser(user.username, user.host, {
+		prevRating: user.rating,
+		rating: miUser.notesCount / elapsedDays,
+	});
+};