Building a Realtime Trello Board with Supabase and Angular

Summary

The tutorial builds a Trello-style project-management board with Supabase, Angular, and Tailwind rather than stopping at a small “hello world” example. It defines boards, lists, cards, users, and user_boards in Postgres SQL, adds magic-link authentication, and uses Row Level Security policies plus helper functions and triggers to control access and maintain relationships. Angular components and services use the Supabase JavaScript client, while realtime is enabled for cards and lists and exposed through an Observable that applies INSERT, UPDATE, and DELETE events to local board state. The resulting clone supports shared boards for invited, already registered users, and the article provides SQL and source code for running the project with a Supabase instance.

Takeaways

1. 1

   The schema uses boards, lists, cards, users, and user_boards tables; cards and lists use cascading foreign keys, and cards store both list_id and board_id.

2. 2

   Row Level Security policies restrict board access through get_boards_for_authenticated_user(), which returns board IDs associated with the authenticated user.

3. 3

   Realtime subscriptions combine card and list changes into one Observable, and the board component applies INSERT, UPDATE, and DELETE events to its local arrays.