codesnips
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
javascript 
import { useLayoutEffect, useRef, useCallback } from 'react';

export function useScrollAnchor(anchorItemCount) {
  const containerRef = useRef(null);
  const savedRef = useRef(null);

Preserve Scroll Position When Loading Older Comments With useLayoutEffect

react hooks uselayouteffect
by codesnips 3 tabs
go 
package ratelimit

import (
	"sync"
	"time"
)

Token Bucket Rate-Limiting Middleware for a Go net/http API

go net-http middleware
by codesnips 4 tabs
lua 
-- KEYS[1] = bucket key
-- ARGV: capacity, refillPerSec, now(ms), cost, ttl(sec)
local capacity      = tonumber(ARGV[1])
local refill        = tonumber(ARGV[2])
local now           = tonumber(ARGV[3])
local cost          = tonumber(ARGV[4])

Token-Bucket Rate Limiting Middleware for Express with Per-Route Config

express rate-limiting token-bucket
by codesnips 3 tabs
go 
package watch

import (
	"sync"
	"time"
)

Debounce Filesystem Change Events Before Triggering a Rebuild in Go

fsnotify debounce filewatcher
by codesnips 3 tabs
go 
package order

type CreateOrderRequest struct {
	Reference string        `json:"reference" binding:"required,min=3,max=40"`
	Currency  string        `json:"currency" binding:"required,currency"`
	Customer  Customer      `json:"customer" binding:"required"`

Binding and Validating Nested JSON in Gin With Custom Validators

go gin validation
by codesnips 4 tabs
sql 
CREATE TABLE country (
    code       CHAR(2)      PRIMARY KEY,
    name       VARCHAR(128) NOT NULL,
    currency   CHAR(3)      NOT NULL,
    updated_at TIMESTAMPTZ  NOT NULL DEFAULT now()
);

Seeding Reference Data After a Flyway Migration with a Java Callback

flyway spring-boot migrations
by codesnips 3 tabs
typescript 
import { RefObject, useEffect, useRef } from "react";

type Handler = (event: MouseEvent | TouchEvent) => void;

export function useClickOutside<T extends HTMLElement>(
  ref: RefObject<T>,

Reusable useClickOutside Hook for Closing Dropdowns in React

react hooks typescript
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
php 
<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Resources\PostResource;

Cursor Pagination for Eloquent Queries Exposed as a JSON API in Laravel

laravel eloquent pagination
by codesnips 3 tabs
rust 
use serde::Deserialize;

#[derive(Debug, Deserialize)]
pub struct Page<T> {
    pub items: Vec<T>,
    #[serde(default)]

Streaming a Paginated HTTP API as a Rust Iterator

rust iterator pagination
by codesnips 3 tabs