codesnips
ruby 
module Authorizable
  extend ActiveSupport::Concern

  class NotAuthorized < StandardError; end

  included do

Rails Policy Authorization with a before_action Concern and 403 Rendering

rails authorization controllers
by codesnips 3 tabs
java 
@Entity
@Table(name = "invoices")
@FilterDef(
    name = "tenantFilter",
    parameters = @ParamDef(name = "tenantId", type = String.class)
)

Per-Tenant Row Filtering with Hibernate @Filter Enabled Per Request

hibernate jpa multi-tenancy
by codesnips 4 tabs
go 
package limiter

import (
	"context"
	"errors"
)

Leaky-Bucket Concurrency Limiter with a Buffered Semaphore Channel in Go

go concurrency rate-limiting
by codesnips 3 tabs
rust 
use serde::Deserialize;
use std::fmt;

#[derive(Debug, Deserialize)]
pub struct UserRecord {
    pub name: String,

Row-by-Row CSV Import Validation With Line-Numbered Errors in Rust

csv serde validation
by codesnips 3 tabs
rust 
use std::collections::HashMap;
use std::sync::Mutex;

pub type AccountId = u64;
pub type Cents = i64;

Atomic Double-Entry Ledger Transfers With Rust Locking and Poison Recovery

ledger concurrency double-entry
by codesnips 3 tabs
php 
<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

Apply and Validate Coupon Codes with a Cart Totals Service in Laravel

laravel eloquent service-layer
by codesnips 4 tabs
rust 
use std::fs;
use std::path::Path;

#[derive(Debug, Clone)]
pub struct Migration {
    pub version: i64,

Sequential Schema Migrations With Version Tracking in Rust and Postgres

migrations postgres sql
by codesnips 3 tabs
rust 
use serde::Serialize;
use serde_json::Value;

#[derive(Debug, Clone, Serialize)]
#[serde(tag = "kind", rename_all = "lowercase")]
pub enum ChangeKind {

Diffing Two Config Snapshots Into a Typed Change List in Rust

rust serde config
by codesnips 3 tabs
java 
package com.example.health;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import javax.sql.DataSource;

Custom Spring Boot Actuator Health Indicators for Database and Disk

spring-boot actuator health-check
by codesnips 3 tabs
javascript 
function escapeCell(value) {
  if (value === null || value === undefined) return '';
  const str = String(value);
  if (/[",\n\r]/.test(str)) {
    return '"' + str.replace(/"/g, '""') + '"';
  }

Stream a Large CSV Export in Express with Backpressure and an Async Row Generator

express streaming csv
by codesnips 3 tabs
javascript 
const { z } = require('zod');

const ConfigSchema = z.object({
  env: z.enum(['development', 'test', 'production']).default('development'),
  port: z.coerce.number().int().positive().default(3000),
  database: z.object({

Cached Config Singleton in Node.js: Load Once, Share Everywhere

nodejs configuration singleton
by codesnips 3 tabs
javascript 
import { useState, useRef, useEffect, useCallback } from 'react';

export function useOnScreen(options = {}) {
  const [node, setNode] = useState(null);
  const [isIntersecting, setIsIntersecting] = useState(false);

Infinite Scroll in React with an IntersectionObserver useOnScreen Hook

react hooks intersection-observer
by codesnips 3 tabs