#activerecord code explainers

ruby

module Paginatable
  extend ActiveSupport::Concern
 
  private

A reusable pagination concern in Rails

pagination concerns http-headers

Intermediate 8 steps

ruby

class Article < ApplicationRecord
  belongs_to :author, class_name: "User"
  has_many :taggings, dependent: :destroy
  has_many :tags, through: :taggings

How scopes compose in Rails

scopes activerecord query-composition

Intermediate 8 steps

ruby

class Registration < ApplicationRecord
  belongs_to :event
 
  validates :email, presence: true, format: { with: URI::MailTo::EMAIL_REGEXP }

Validating registrations in Rails

validations i18n error-handling

Intermediate 8 steps

ruby

class User < ApplicationRecord
  has_secure_password
 
  normalizes :email, with: ->(email) { email.strip.downcase }

Normalizing user input in Rails models

normalization validation data integrity

Intermediate 6 steps

ruby

class Subscription < ApplicationRecord
  belongs_to :account
 
  enum :status, {

Modeling subscription lifecycle in Rails

enums scopes state-management

Intermediate 8 steps

ruby

class InactiveAccountCleanup
  BATCH_SIZE = 500
  INACTIVITY_THRESHOLD = 18.months

Batch-processing dormant users in Rails

batch-processing activerecord service-object

Intermediate 9 steps

ruby

class Article < ApplicationRecord
  belongs_to :author
 
  default_scope { where(deleted_at: nil) }

How scopes compose in Rails

scopes query-composition activerecord

Intermediate 9 steps