#n+1 code explainers

typescript

import { Injectable, Scope } from '@nestjs/common';
import DataLoader from 'dataloader';
import { InjectRepository } from '@nestjs/typeorm';
import { In, Repository } from 'typeorm';

Batching queries with DataLoader in NestJS

dataloader batching n+1

Intermediate 7 steps

python

from django.db.models import Prefetch, Count
from django.views.generic import ListView
 
from .models import Article, Comment

Building an efficient article list in Django

orm query-optimization prefetching

Intermediate 6 steps

php

class PostController extends Controller
{
    public function index(Request $request)
    {

Eager loading without N+1 in Laravel

eager-loading n+1 query-builder

Intermediate 9 steps