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Building Real-Time Apps with Superbase

Mar 19, 2025

Real-Time Application with Superbase

Introduction to Real-Time Features

  • Real-time allows for instant updates, similar to a chat application.
  • Demonstration involves creating a message-posting application.

Setting Up the Database

  • Create a New Table: Named post.
    • Fields include:
      • name: Text, not nullable.
      • description: Text, not nullable.
  • Enable Real-Time:
    • Locate table post.
    • Enable "Real-time broadcast changes".

Authentication and Policies

  • Navigate to Authentication Policies:
    • Add a new policy for read access for everyone.
    • Use role Anon for public access.
    • Create post policy to allow everyone to post.
    • Modify to allow Anon role to insert messages.

Coding Integration

  • Insert Functionality:
    • Insert new messages into the post table.
    • Local message updates upon data return.
  • Testing Message Insertion:
    • Input: test, and confirm insertion into database.
  • Real-Time Message Display:
    • Create a Fetch message function or subscribe to table changes.
    • Utilize client.channel.on for real-time subscription:
      • Subscribe to events on public schema, post table.
      • Log payload to verify message receipt.

Real-Time Subscription Testing

  • Example: Insert "code with Gom" and "hello there".
    • Observe message appearance in real-time.
  • Payload Handling:
    • Messages are pushed to a local message list from payload data.

Testing the Application

  • Test the real-time features at superbase-real-time.netlify.app.
  • Multiple users can post and see updates simultaneously.