Launch Darkly in Rails App

launch_darkly_wh_ex.rb

# You may need to add /lib to your autoload paths in /config/application.rb
config.autoload_paths += %W(#{config.root}/lib)

# /lib/extensions/launch_darkly.rb
module Extensions
  module LaunchDarkly
    def self.included(c)
      return unless c
      c.helper_method :pilot_navbar? # anything that needs view-level control
    end

    def ld
      @ld_client ||= ::LaunchDarkly::LDClient.new(ENV['LAUNCH_DARKLY_API_KEY'])
    end

    def pilot_redirect?
      feature?('inthepilot.redirect')
    end

    def pilot_navbar?
      feature?('inthepilot.navbar')
    end

    def feature?(key)
      return unless current_user # current_user helper defined by Devise gem
      ld.get_flag?(key, { key: current_user.slug, ip: current_user.account.current_sign_in_ip, custom: { member: current_user.memberships.any? } }, false)
    end
  end
end


# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
  include Extensions::LaunchDarkly
  
end

# where ever we need feature flags in our codebase...
  def redirects
    case
    when pilot_redirect?
      authenticated_pilot_home
    when
      #...
    else
    end
  end

# Navbar in our html.haml files
- if pilot_navbar?
  # pilot navbar
- else
  # standard navbar