codesnips
typescript 
import {
  WebSocketGateway,
  WebSocketServer,
  SubscribeMessage,
  OnGatewayConnection,
  OnGatewayDisconnect,

Room-Based Live Notifications over a NestJS WebSocket Gateway

nestjs websockets socket-io
by codesnips 4 tabs
ruby 
class ApplicationPolicy
  attr_reader :user, :record

  def initialize(user, record)
    @user = user
    @record = record

Authorizing Controller Actions with Pundit Policy Objects in Rails

rails pundit authorization
by codesnips 3 tabs
python 
import magic
from django import forms
from django.core.exceptions import ValidationError
from django.template.defaultfilters import filesizeformat

Validating Upload Size and MIME Type in a Custom Django Form Field

django forms file-upload
by codesnips 3 tabs
javascript 
import { useEffect, useState } from "react";

export function useDebouncedValue(value, delay = 300) {
  const [debounced, setDebounced] = useState(value);

  useEffect(() => {

Debounced Search Input in React with a Reusable useDebouncedValue Hook

react hooks debounce
by codesnips 3 tabs
php 
<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

Cursor Pagination in Laravel with API Resources and Encoded Cursors

laravel pagination cursor-pagination
by codesnips 3 tabs
ruby 
class CounterFlushJob
  include Sidekiq::Job
  sidekiq_options queue: :counters, retry: 3

  def perform
    CounterBuffer.flush_all.each do |field, delta|

Coalesced Counter Cache with Redis Buffering and Nightly Reconciliation in Rails

rails counter-cache redis
by codesnips 4 tabs
python 
import os
import uuid

from flask import Blueprint, current_app, jsonify, request
from werkzeug.exceptions import RequestEntityTooLarge

Streaming Large Multipart File Uploads to Disk in Flask Without Buffering

flask werkzeug streaming
by codesnips 3 tabs
javascript 
export const initialCart = { items: {} };

export function cartReducer(state, action) {
  switch (action.type) {
    case 'ADD_ITEM': {
      const { product, qty = 1 } = action;

Persist and Hydrate a Shopping Cart with useReducer and localStorage

react hooks usereducer
by codesnips 3 tabs
python 
import threading
from contextlib import contextmanager

_state = threading.local()

Per-Tenant Data Isolation in Django with a Thread-Local Current Tenant Manager

django multi-tenancy orm
by codesnips 4 tabs
java 
package com.example.payments;

import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Timer;
import org.springframework.stereotype.Service;

Instrumenting a Spring Service with Micrometer Counters, Timers, and @Timed

spring-boot micrometer metrics
by codesnips 3 tabs
go 
package session

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/base64"

Stateless Session Cookies Signed and Verified With HMAC in Go

go security cookies
by codesnips 3 tabs
javascript 
const DEFAULTS = {
  baseDelay: 300,
  maxDelay: 8000,
  factor: 2,
  jitter: 0.5,
};

Retry Failed React Mutations with Exponential Backoff and a Status Component

react hooks retry
by codesnips 4 tabs