class ActiveSupport::CurrentAttributes

sticking controller-specific attributes in there, you’re going to create a mess.
The attributes stuck in Current should be used by more or less all actions on all requests. If you start
Current should only be used for a few, top-level globals, like account, user, and request details.
A word of caution: It’s easy to overdo a global singleton like Current and tangle your model as a result.
end
end
self.ip_address = Current.ip_address
self.user_agent = Current.user_agent
self.request_id = Current.request_id
before_create do
class Event < ApplicationRecord
end
after_create { |message| Event.create(record: message) }
belongs_to :creator, default: -> { Current.user }
class Message < ApplicationRecord
end
end
Current.account.messages.create(message_params)
def create
class MessagesController < ApplicationController
end
include SetCurrentRequestDetails
include Authentication
class ApplicationController < ActionController::Base
end
end
end
Current.ip_address = request.ip
Current.user_agent = request.user_agent
Current.request_id = request.uuid
before_action do
included do
extend ActiveSupport::Concern
module SetCurrentRequestDetails
# app/controllers/concerns/set_current_request_details.rb
end
end
end
redirect_to new_session_url
else
Current.user = authenticated_user
if authenticated_user = User.find_by(id: cookies.encrypted)
def authenticate
private
end
before_action :authenticate
included do
extend ActiveSupport::Concern
module Authentication
# app/controllers/concerns/authentication.rb
end
end
Time.zone = user.time_zone
self.account = user.account
super
def user=(user)
resets { Time.zone = nil }
attribute :request_id, :user_agent, :ip_address
attribute :account, :user
class Current < ActiveSupport::CurrentAttributes
# app/models/current.rb
around everywhere:
facilitate easy access to the global, per-request attributes without passing them deeply
The following full app-like example demonstrates how to use a Current class to
available to the whole system.
before and after each request. This allows you to keep all the per-request attributes easily
Abstract super class that provides a thread-isolated attributes singleton, which resets automatically
= Current Attributes

def attribute(*names, default: NOT_SET)

Default values are re-assigned when the attributes are reset.
constructed. Otherwise, the value will be duplicated with +#dup+.
is a proc or lambda, it will be called whenever an instance is
* :default - The default value for the attributes. If the value

==== Options

Declares one or more attributes that will be given both class and instance accessor methods. 
def attribute(*names, default: NOT_SET)
  invalid_attribute_names = names.map(&:to_sym) & INVALID_ATTRIBUTE_NAMES
  if invalid_attribute_names.any?
    raise ArgumentError, "Restricted attribute names: #{invalid_attribute_names.join(", ")}"
  end
  ActiveSupport::CodeGenerator.batch(generated_attribute_methods, __FILE__, __LINE__) do |owner|
    names.each do |name|
      owner.define_cached_method(name, namespace: :current_attributes) do |batch|
        batch <<
          "def #{name}" <<
          "attributes[:#{name}]" <<
          "end"
      end
      owner.define_cached_method("#{name}=", namespace: :current_attributes) do |batch|
        batch <<
          "def #{name}=(value)" <<
          "attributes[:#{name}] = value" <<
          "end"
      end
    end
  end
  Delegation.generate(singleton_class, names, to: :instance, nilable: false, signature: "")
  Delegation.generate(singleton_class, names.map { |n| "#{n}=" }, to: :instance, nilable: false, signature: "value")
  self.defaults = defaults.merge(names.index_with { default })
end

def before_reset(*methods, &block)

Calls this callback before #reset is called on the instance. Used for resetting external collaborators that depend on current values. 
def before_reset(*methods, &block)
  set_callback :reset, :before, *methods, &block
end

def clear_all # :nodoc:

:nodoc: 
def clear_all # :nodoc:
  reset_all
  current_instances.clear
end

def current_instances 

def current_instances
  IsolatedExecutionState[:current_attributes_instances] ||= {}
end

def current_instances_key 

def current_instances_key
  @current_instances_key ||= name.to_sym
end

def generated_attribute_methods 

def generated_attribute_methods
  @generated_attribute_methods ||= Module.new.tap { |mod| include mod }
end

def initialize 

def initialize
  @attributes = resolve_defaults
end

def instance

Returns singleton instance for this class in this thread. If none exists, one is created. 
def instance
  current_instances[current_instances_key] ||= new
end

def method_added(name) 

def method_added(name)
  super
  return if name == :initialize
  return unless public_method_defined?(name)
  return if singleton_class.method_defined?(name) || singleton_class.private_method_defined?(name)
  Delegation.generate(singleton_class, [name], to: :instance, as: self, nilable: false)
end

def method_missing(name, ...) 

def method_missing(name, ...)
  instance.public_send(name, ...)
end

def reset

Reset all attributes. Should be called before and after actions, when used as a per-request singleton. 
def reset
  run_callbacks :reset do
    self.attributes = resolve_defaults
  end
end

def reset_all # :nodoc:

:nodoc: 
def reset_all # :nodoc:
  current_instances.each_value(&:reset)
end

def resets(*methods, &block)

Calls this callback after #reset is called on the instance. Used for resetting external collaborators, like Time.zone. 
def resets(*methods, &block)
  set_callback :reset, :after, *methods, &block
end

def resolve_defaults 

def resolve_defaults
  defaults.each_with_object({}) do |(key, value), result|
    if value != NOT_SET
      result[key] = Proc === value ? value.call : value.dup
    end
  end
end

def respond_to_missing?(name, _) 

def respond_to_missing?(name, _)
  instance.respond_to?(name) || super
end

def set(attributes, &block)

end
end
end
Chat::Publisher.publish(attributes: attributes, room_number: room_number)
Current.set(person: creator) do
def perform(attributes, room_number, creator)
class Chat::PublicationJob < ApplicationJob

Example demonstrating the common use of needing to set Current attributes outside the request-cycle:
Expose one or more attributes within a block. Old values are returned after the block concludes. 
def set(attributes, &block)
  with(**attributes, &block)
end