appwrite/docs/examples/1.8.x/server-ruby/examples/messaging/get-topic.md

require 'appwrite'

include Appwrite

client = Client.new
    .set_endpoint('https://<REGION>.cloud.appwrite.io/v1') # Your API Endpoint
    .set_project('<YOUR_PROJECT_ID>') # Your project ID
    .set_key('<YOUR_API_KEY>') # Your secret API key

messaging = Messaging.new(client)

result = messaging.get_topic(
    topic_id: '<TOPIC_ID>'
)