#controllers code explainers

ruby

class SearchController < ApplicationController
  def index
    @query = params[:q].to_s.strip
  end

Live search suggestions in a Rails controller

controllers sql-injection query-building

Intermediate 6 steps

typescript

import { Controller, Get, Param, Post, Body, Version, VERSION_NEUTRAL } from '@nestjs/common';
import { UsersService } from './users.service';
import { CreateUserDto } from './dto/create-user.dto';

How API versioning works in NestJS

api-versioning routing dependency-injection

Intermediate 9 steps

ruby

class HealthController < ApplicationController
  skip_before_action :authenticate_user!, raise: false
  skip_forgery_protection

Building a health check endpoint in Rails

health-check monitoring error-handling

Intermediate 7 steps

ruby

module Api
  module V1
    class BaseController < ActionController::API
      rescue_from StandardError, with: :render_internal_error

Centralized API error handling in Rails

error-handling rescue-from json-api

Intermediate 7 steps

php

<?php
 
namespace App\Http\Controllers;

Handling avatar uploads in Laravel

file-upload image-processing validation

Intermediate 8 steps