codesnips
ruby 
class Post < ApplicationRecord
  belongs_to :author, class_name: 'User'
  has_many :comments, dependent: :destroy

  scope :published, -> { where.not(published_at: nil).where('published_at <= ?', Time.current) }
  scope :draft, -> { where(published_at: nil) }

ActiveRecord scopes for reusable query logic

rails activerecord patterns
by Alex Kumar 1 tab
yaml 
:concurrency: 10
:queues:
  - [critical, 4]
  - [default, 2]
  - [low, 1]

Background jobs with Sidekiq and reliable queues

rails sidekiq background-jobs
by Alex Kumar 2 tabs
ruby 
Rails.application.configure do
  config.after_initialize do
    Bullet.enable = true
    Bullet.alert = false
    Bullet.bullet_logger = true
    Bullet.console = true

N+1 query detection with Bullet gem

rails performance activerecord
by Alex Kumar 2 tabs
ruby 
module CursorPagination
  extend ActiveSupport::Concern

  private

  def paginate_with_cursor(scope, per_page: 20)

Pagination with cursor-based approach

rails api pagination
by Alex Kumar 1 tab
ruby 
module ApiErrorHandler
  extend ActiveSupport::Concern

  included do
    rescue_from StandardError, with: :handle_standard_error
    rescue_from ActiveRecord::RecordNotFound, with: :handle_not_found

Structured JSON error responses

rails api error-handling
by Alex Kumar 1 tab
ruby 
class Rack::Attack
  Rack::Attack.cache.store = ActiveSupport::Cache::RedisCacheStore.new(url: ENV['REDIS_URL'])

  safelist('allow-localhost') do |req|
    req.ip == '127.0.0.1' || req.ip == '::1'
  end

Rate limiting with Redis and Rack::Attack

rails security redis
by Alex Kumar 1 tab
ruby 
class JwtService
  ACCESS_TOKEN_LIFETIME = 15.minutes
  REFRESH_TOKEN_LIFETIME = 7.days
  SECRET = Rails.application.credentials.jwt_secret

  def self.encode_access_token(user_id)

JWT authentication with refresh tokens

rails authentication jwt
by Alex Kumar 1 tab
ruby 
Rails.application.routes.draw do
  namespace :api do
    namespace :v1 do
      resources :users, only: [:index, :show, :create, :update]
      resources :posts do
        resources :comments, only: [:index, :create]

API versioning with namespace routing

rails api versioning
by Alex Kumar 2 tabs
go 
package middleware

import (
  "log"
  "net/http"
  "runtime/debug"

Panic recovery middleware that fails closed and logs context

go http middleware
by Leah Thompson 1 tab
go 
package dbutil

import (
  "context"

  "github.com/jackc/pgconn"

Retry Postgres serialization failures with bounded attempts

go postgres transactions
by Leah Thompson 1 tab
go 
package cleanup

import "errors"

func CloseAll(closers ...func() error) error {
  var errs []error

errors.Join for cleanup (surface multiple close failures)

go errors reliability
by Leah Thompson 1 tab
go 
package middleware

import "net/http"

type StatusRecorder struct {
  http.ResponseWriter

Capture status code and bytes written via ResponseWriter wrapper

go http observability
by Leah Thompson 1 tab