ActiveSupport::CurrentAttributes provides a thread-isolated attributes singleton

# app/models/current.rb
class Current < ActiveSupport::CurrentAttributes
  attribute :account, :user
  attribute :request_id, :user_agent, :ip_address 
  resets { Time.zone = nil }
  def user=(user)
    super
    self.account = user.account
    Time.zone = user.time_zone
  end
end
# app/controllers/concerns/authentication.rb
module Authentication
  extend ActiveSupport::Concern
  included do
    before_action :set_current_authenticated_user
  end
  private
    def set_current_authenticated_user
      Current.user = User.find(cookies.signed[:user_id])
    end
end
# app/controllers/concerns/set_current_request_details.rb
module SetCurrentRequestDetails
  extend ActiveSupport::Concern
  included do
    before_action do
      Current.request_id = request.uuid
      Current.user_agent = request.user_agent
      Current.ip_address = request.ip
    end
  end
end  
class ApplicationController < ActionController::Base
  include Authentication
  include SetCurrentRequestDetails
end
class MessagesController < ApplicationController
  def create
    Current.account.messages.create(message_params)
  end
end
class Message < ApplicationRecord
  belongs_to :creator, default: -> { Current.user }
  after_create { |message| Event.create(record: message) }
end
class Event < ApplicationRecord
  before_create do
    self.request_id = Current.request_id
    self.user_agent = Current.user_agent
    self.ip_address = Current.ip_address
  end
end