codesnips
java 
@Entity
@Table(name = "idempotency_records",
       uniqueConstraints = @UniqueConstraint(columnNames = "idempotency_key"))
public class IdempotencyRecord {

    public enum Status { IN_PROGRESS, COMPLETED }

Idempotent POST Handling in Spring Boot with a Stored Idempotency-Key

spring-boot idempotency rest-api
by codesnips 3 tabs
go 
package domain

import "time"

type DomainEvent interface {
	EventName() string

Custom MarshalJSON for Domain Events With a Type Discriminator Envelope

go json serialization
by codesnips 3 tabs
rust 
use once_cell::sync::Lazy;
use regex::Regex;
use std::str::FromStr;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum Severity {

Grouping Log Lines by Severity and Emitting a Summary Report in Rust

logging parsing cli
by codesnips 3 tabs
typescript 
import { useCallback, useEffect, useReducer } from "react";

type State = { secondsLeft: number; isRunning: boolean };
type Action =
  | { type: "start"; seconds: number }
  | { type: "tick" }

Resend-Code Button With a Countdown Timer Using useEffect Cleanup

react hooks useeffect
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 AddSoftDeleteToDocuments < ActiveRecord::Migration[7.0]
  def change
    add_column :documents, :deleted_at, :datetime
    add_index :documents, :deleted_at

    # Replace the global unique index with one scoped to live rows,

Soft-Delete in Rails with a Default Scope, Restore Action, and Unique Index Handling

rails activerecord soft-delete
by codesnips 3 tabs
javascript 
import { useMemo, useCallback } from 'react';
import { useSearchParams } from 'react-router-dom';

function parseFilters(params) {
  return {
    q: params.get('q') || '',

Sync Filter State to the URL with a useSearchParams-Driven Filter Bar in React Router

react react-router hooks
by codesnips 3 tabs
java 
package com.example.cache;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CompletionException;
import java.util.concurrent.atomic.AtomicBoolean;

Single-Flight Cache Loader: Coalesce Concurrent Identical Loads in Java

caching concurrency single-flight
by codesnips 3 tabs
python 
from django.db import models
from django.db.models import Avg, Count, Sum, DecimalField
from django.db.models.functions import Coalesce, TruncDate
from django.utils import timezone

Daily Order Stats Rollup with Django TruncDate Aggregation and a JSON API View

django orm aggregation
by codesnips 3 tabs
python 
import re

EMAIL_RE = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")


class SignupValidator:

Validate a Flask Signup Form and Collect Per-Field Errors

flask validation forms
by codesnips 4 tabs
javascript 
export function clamp(value, min, max) {
  return Math.min(Math.max(value, min), max);
}

export function move(list, from, to) {
  const next = list.slice();

Drag-and-Drop Sortable List with Pointer Events and an Immutable Reorder Helper

react drag-and-drop pointer-events
by codesnips 3 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