Build any realtime experience using Ably’s Pub/Sub Ruby SDK, Supported on all popular platforms and frameworks.
Ably Pub/Sub provides flexible APIs that deliver features such as pub-sub messaging, message history, presence, and push notifications. Utilizing Ably’s realtime messaging platform, applications benefit from its highly performant, reliable, and scalable infrastructure.
Find out more:
Everything you need to get started with Ably:
Ably aims to support a wide range of platforms and browsers. If you experience any compatibility issues, open an issue in the repository or contact Ably support.
| Platform | Support |
|---|---|
| Ruby | >= 2.7 and 3.x. For EventMachine compatibility with Ruby 3.x |
| EventMachine | Required for using the Realtime API. Compatible with Ruby 3.x with OpenSSL configuration. |
| libcurl | Required since v1.1.5. On Debian-based systems, install via sudo apt-get install libcurl4. |
Important
SDK versions < 1.2.5 will be deprecated from November 1, 2025.
To get started with your project, install the package:
# Create a new Gemfile
echo "source 'https://rubygems.org'" > Gemfile
echo "gem 'ably'" >> Gemfile
# Install the gem
bundle installNote
Install Ruby version 2.7 or greater.
To use the Ably Realtime SDK in Ruby, the EventMachine reactor loop must be running. This is required because the Realtime library depends on EventMachine to handle asynchronous events.
Wrap your code inside a EventMachine.run block:
require 'ably'
EventMachine.run do
client = Ably::Realtime.new(key: 'your-api-key')
client.connection.connect do
puts "Connected with connection ID: #{client.connection.id}"
endThe following code connects to Ably's realtime messaging service, subscribes to a channel to receive messages, and publishes a test message to that same channel.
# Initialize Ably Realtime client
realtime_client = Ably::Realtime.new(key: 'your-ably-api-key', client_id: 'me')
# Wait for connection to be established
realtime_client.connection.on(:connected) do
puts 'Connected to Ably'
# Get a reference to the 'test-channel' channel
channel = realtime_client.channels.get('test-channel')
# Subscribe to all messages published to this channel
channel.subscribe do |message|
puts "Received message: #{message.data}"
end
# Publish a test message to the channel
channel.publish 'test-event', 'hello world'
end
endThe CHANGELOG.md contains details of the latest releases for this SDK. You can also view all Ably releases on changelog.ably.com.
Read the CONTRIBUTING.md guidelines to contribute to Ably.
For help or technical support, visit Ably's support page. You can also view the community reported Github issues or raise one yourself.