codesnips

ruby

ruby 
class Coupon < ApplicationRecord
  before_validation :normalize_code

  validates :code,
            coupon_code: { min_length: 6 },
            uniqueness: { case_sensitive: false }

Validating Coupon Codes with a Custom EachValidator in Rails

rails validations activerecord
by codesnips 3 tabs
ruby 
class WebhookSignature
  class VerificationError < StandardError; end

  TOLERANCE = 300 # seconds

  def initialize(payload:, header:, secrets:)

Robust Webhook Verification (HMAC + Timestamp)

rails security webhooks
by codesnips 3 tabs
ruby 
class CreateComments < ActiveRecord::Migration[6.1]
  def change
    create_table :comments do |t|
      t.references :commentable, polymorphic: true, null: false
      t.references :author, null: false, foreign_key: { to_table: :users }
      t.text :body, null: false

Polymorphic associations for flexible relationships

rails activerecord database
by Alex Kumar 3 tabs
ruby 
class DashboardMetrics
  include ActiveModel::Model

  attr_reader :account

  def initialize(account)

Expiring Dashboard Fragment Caches with a Versioned Composite Cache Key in Rails

rails caching fragment-caching
by codesnips 3 tabs
ruby 
class AddressForm
  include ActiveModel::Model
  include ActiveModel::Attributes

  attribute :line1, :string
  attribute :line2, :string

Rails Nested Address Form Object With Aggregated ActiveModel Errors

rails activemodel form-object
by codesnips 3 tabs
ruby 
class ShippedEmailJob
  include Sidekiq::Job
  sidekiq_options queue: :mailers, retry: 5

  def perform(order_id)
    order = Order.find_by(id: order_id)

Fan Out Notifications to Email and SMS Using an ActiveRecord Observer

rails activerecord observer
by codesnips 3 tabs
ruby 
class EmailDedupService
  DEFAULT_TTL = 5.minutes.to_i

  def self.claim(fingerprint, ttl: DEFAULT_TTL)
    key = "email_dedup:#{fingerprint}"
    # Atomic set-if-absent with expiry; returns true only for the first caller.

Throttle Duplicate Emails in Rails with a Mailer Interceptor and Redis Dedup Service

rails actionmailer redis
by codesnips 3 tabs
ruby 
class TenantResolver
  RESERVED = %w[www app admin].freeze

  def initialize(app)
    @app = app
  end

Multi-Tenant Subdomain Isolation with Rack Middleware and Thread-Local Scoping

rails rack multi-tenancy
by codesnips 4 tabs
ruby 
class CommentsController < ApplicationController
  before_action :set_post

  def new
    @comment = @post.comments.build
  end

Turbo Stream form errors: replace only the form frame

rails turbo hotwire
by codesnips 4 tabs
ruby 
module RequestStore
  def self.store
    Thread.current[:request_store] ||= {}
  end

  def self.fetch(key)

Hot Path Memoization (within request only)

rails performance memoization
by codesnips 4 tabs
ruby 
class CounterBuffer
  DELTA_HASH = "counter:deltas".freeze

  READ_RESET = <<~LUA.freeze
    local v = redis.call('HGET', KEYS[1], ARGV[1])
    if v then redis.call('HDEL', KEYS[1], ARGV[1]) end

Debounce Expensive Counter Cache Updates with a Throttled Redis Buffer in Rails

rails redis counter-cache
by codesnips 3 tabs
ruby 
class ImportRun < ApplicationRecord
  enum status: { pending: 0, running: 1, completed: 2, failed: 3 }

  def percent
    return 0 if total.to_i.zero?
    [(processed.to_f / total * 100).round, 100].min

Live Turbo Streams Progress Bar for a Long Rails Job

rails turbo-streams hotwire
by codesnips 4 tabs