Eatarai (เมื่อไรจะไปกิน)

LINE bot for shared restaurant wishlists with LIFF and Google Maps links

Overview

Built Eatarai (เมื่อไรจะไปกิน — “When are we going to eat?”), a LINE bot for keeping a shared restaurant wishlist. Each LINE group, room, and direct chat has its own list. People can add restaurants, remove them after a visit, and open saved locations in Google Maps from the shared list.

LINE message showing a shared restaurant wishlist with Google Maps links
The bot posts the latest restaurant list in LINE, with a map link for each saved location.

Project Context

Technical Approach

  • Serverless Backend: A Cloudflare Worker receives LINE webhooks and reads or writes restaurant lists through Supabase REST/RPC, backed by PostgreSQL with row-level security
  • LIFF Restaurant Search: A LINE LIFF page uses the member’s current location to search nearby branches with Google Places Text Search; selected branches are saved with map links
  • Controlled API Usage: Text commands to add, remove, or list restaurants do not call Google Places. LIFF searches use daily limits and server-side rate limiting
  • Chat Updates: A Cloudflare Durable Object coordinates publishing the latest list after changes, so members see an updated list in their LINE chat

Key Features

  • Chat Commands: Mention the bot to show the list, add a restaurant, remove one, or mark it as eaten
  • Shared LIFF Menu: Chat members can open the add/remove menu for five minutes; each member gets a separate, single-use session
  • Flexible Removal: If a restaurant name is abbreviated or close to another name, the bot asks which item to remove
  • LIFF Menu: Add restaurants by searching nearby branches or select multiple items to remove through a LINE mini-app
  • Map Links: Saved places appear in the list with links to Google Maps

Technologies Used

Category Tools
Runtime Cloudflare Workers, Durable Objects, TypeScript
Backend & DB Supabase (PostgreSQL, RPC)
Messaging LINE Messaging API, LINE LIFF
External APIs Google Places API (Text Search)

Source & Links