The strange and wonderful world of forgotten Rails features: HTTP Streaming

newrelic.yml

browser_monitoring:
  auto_instrument: false

projects_controller.rb

class ProjectsController < ApplicationController
  respond_to :html

  def index
    @projects = Project.scoped
    respond_with @projects, stream: true
  end
end

Railscasts 1 projects_controller.rb

class ProjectsController < ApplicationController
  stream

  def index
    # rest of controller code
  end
end

Railscasts 2 projects_controller.rb

def index
  @projects = Project.all
  render :stream => true
end

unicorn.rb

worker_processes 3
timeout 30
preload_app true
port = ENV["PORT"].to_i
listen port, tcp_nopush: false

before_fork do |server, worker|
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.connection.disconnect!
    Rails.logger.info('Disconnected from ActiveRecord')
  end
  
  sleep 1
end

after_fork do |server, worker|
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.establish_connection
    Rails.logger.info('Connected to ActiveRecord')
  end
  
  if defined?(ActiveSupport::Cache::DalliStore) && Rails.cache.is_a?(ActiveSupport::Cache::DalliStore)
    # Reset Rails's object cache
    # Only works with DalliStore
    Rails.cache.reset

    # Reset Rails's session store
    # If you know a cleaner way to find the session store instance, please let me know
    ObjectSpace.each_object(ActionDispatch::Session::DalliStore) { |obj| obj.reset }
  end
end