codesnips
python 
from werkzeug.routing import BaseConverter
from werkzeug.exceptions import NotFound
from flask import abort


class ModelConverter(BaseConverter):

Auto-Loading SQLAlchemy Models in Flask Routes With a Custom URL Converter

flask werkzeug sqlalchemy
by codesnips 3 tabs
javascript 
import { useReducer, useCallback } from 'react';

const initialState = (present) => ({ past: [], present, future: [] });

function historyReducer(state, action) {
  const { past, present, future } = state;

Build an Undo/Redo History Stack with a useHistory Reducer Hook in React

react hooks usereducer
by codesnips 3 tabs
python 
from enum import Enum
from typing import Optional

from fastapi import Query
from pydantic import BaseModel, Field, field_validator

Validate and Normalize Query Filters With a Pydantic Dependency in FastAPI

fastapi pydantic validation
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
go 
package httpstream

import (
	"bufio"
	"database/sql"
	"fmt"

Streaming Large SQL Query Results as a JSON Array in Go

go database sql
by codesnips 2 tabs
typescript 
import { Exclude, Expose } from 'class-transformer';

export class User {
  id: string;

  firstName: string;

Hide Sensitive Fields in NestJS Responses with class-transformer and ClassSerializerInterceptor

nestjs class-transformer serialization
by codesnips 3 tabs
java 
@RestController
@RequestMapping("/users")
public class UserPatchController {

    private final UserRepository users;
    private final JsonPatchService patchService;

Applying RFC 6902 JSON Patch with Optimistic Locking in Spring Boot

spring-boot rest-api json-patch
by codesnips 3 tabs
javascript 
function parseRange(header, size) {
  if (!header || !header.startsWith('bytes=')) return null;

  const [rawStart, rawEnd] = header.replace('bytes=', '').split('-');
  let start;
  let end;

HTTP Range Requests for Video Streaming in Node.js With fs.createReadStream

nodejs http streaming
by codesnips 3 tabs
python 
import time
from collections import namedtuple

from sqlalchemy import text

CheckResult = namedtuple("CheckResult", ["name", "healthy", "latency_ms", "detail"])

Flask Health-Check Blueprint Reporting Database and Redis Status as JSON

flask health-check observability
by codesnips 3 tabs
ruby 
require "sinatra/base"
require "rack/utils"

class AdminApp < Sinatra::Base
  before do
    protected!

Protecting Namespaced Admin Routes in Sinatra with an HTTP Basic Auth before Filter

sinatra http-basic-auth authentication
by codesnips 3 tabs
java 
package com.shop.payments.messaging;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

public record PaymentEvent(

Idempotent Kafka Consumer With @KafkaListener and Manual Ack in Spring Boot

spring-boot kafka spring-kafka
by codesnips 3 tabs
rust 
#[derive(Debug, Clone)]
pub struct Order {
    pub id: u64,
    pub amount_cents: i64,
    pub currency: [u8; 3],
}

Partition a Slice of Orders into Shards for Parallel Processing with Rayon

rust rayon parallelism
by codesnips 2 tabs