Code Explainers

Code explainers tagged #concerns

ruby 
class Current < ActiveSupport::CurrentAttributes
  attribute :user, :request_id, :user_agent, :ip_address
 
  resets { Time.zone = nil }

Per-request audit trails with Current in Rails

thread-local-state auditing concerns
Intermediate 8 steps
ruby 
class ReportingQuery
  def initialize(scope = ApplicationRecord)
    @scope = scope
  end

Routing heavy reports to a read replica in Rails

read-replica database-roles query-object
Intermediate 6 steps
ruby 
module Paginatable
  extend ActiveSupport::Concern
 
  private

A reusable pagination concern in Rails

pagination concerns http-headers
Intermediate 8 steps
ruby 
module Authenticatable
  extend ActiveSupport::Concern
 
  included do

JWT authentication as a Rails concern

authentication jwt concerns
Intermediate 6 steps
ruby 
class Comment < ApplicationRecord
  belongs_to :commentable, polymorphic: true, counter_cache: true
  belongs_to :author, class_name: "User"
 

How polymorphic comments work in Rails

polymorphic-association concerns counter-cache
Intermediate 8 steps
ruby 
module SoftDeletable
  extend ActiveSupport::Concern
 
  included do

How a soft-delete concern works in Rails

concerns soft-delete scopes
Intermediate 8 steps