unleash.unleash/website/docs/sdks/ruby.md

id	title
ruby_sdk	Ruby SDK

You will need your API URL and your API token in order to connect the Client SDK to you Unleash instance. You can find this information in the “Admin” section Unleash management UI. Read more

require 'unleash'

@unleash = Unleash::Client.new(
  url: '<API url>',
  app_name: 'simple-test',
  custom_http_headers: {'Authorization': '<API token>'},
)

Sample usage

To evaluate a feature toggle, you can use:

if @unleash.is_enabled? "AwesomeFeature", @unleash_context
  puts "AwesomeFeature is enabled"
end

If the feature is not found in the server, it will by default return false. However you can override that by setting the default return value to true:

if @unleash.is_enabled? "AwesomeFeature", @unleash_context, true
  puts "AwesomeFeature is enabled by default"
end

Alternatively by using if_enabled you can send a code block to be executed as a parameter:

@unleash.if_enabled "AwesomeFeature", @unleash_context, true do
  puts "AwesomeFeature is enabled by default"
end

Variations

If no variant is found in the server, use the fallback variant.

fallback_variant = Unleash::Variant.new(name: 'default', enabled: true, payload: {"color" => "blue"})
variant = @unleash.get_variant "ColorVariants", @unleash_context, fallback_variant

puts "variant color is: #{variant.payload.fetch('color')}"

Client methods

Method Name	Description	Return Type
is_enabled?	Check if feature toggle is to be enabled or not.	Boolean
enabled?	Alias to the is_enabled? method. But more ruby idiomatic.	Boolean
if_enabled	Run a code block, if a feature is enabled.	yield
get_variant	Get variant for a given feature	Unleash::Variant
shutdown	Save metrics to disk, flush metrics to server, and then kill ToggleFetcher and MetricsReporter threads. A safe shutdown. Not really useful in long running applications, like web applications.	nil
shutdown!	Kill ToggleFetcher and MetricsReporter threads immediately.	nil

Read more at github.com/Unleash/unleash-client-ruby