word-salad/app/Console/Commands/QueueNewArticleAlertForSubscribers.php

<?php

namespace App\Console\Commands;

use App\Mail\NewArticlePublished;
use App\Models\Article;
use App\Models\Subscriber;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Mail;

class QueueNewArticleAlertForSubscribers extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'app:queue-new-article-alert-for-subscribers';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Gets all the published articles that have yet to have subscribers notified and queues notification emails for all the subscribers in the list.';

    /**
     * Execute the console command.
     */
    public function handle()
    {
        $startTime = microtime(true);

        // TODO: Incredibly basic implementation here. Won't scale well past a few thousand subscribers
        $articlesForNotification = Article::query()
            ->where('published_at', '<', now())
            ->whereNull('subscribers_notified_at')
            ->get();

        logger(count($articlesForNotification) . ' article(s) ready for notifying.');

        // HARD CODE LIMIT 100 subscribers. (Kinda scared of gettings spammed and want to monitor it slowly)
        $subscribersToNotify = Subscriber::limit(100)->get();

        logger(count($subscribersToNotify) . ' subscribers(s) to notify.');

        logger((count($articlesForNotification) * count($subscribersToNotify)) . ' emails being queued for send.');

        foreach($articlesForNotification as $article) {

            $article->update(['subscribers_notified_at' => now()]);

            foreach($subscribersToNotify as $subscriber) {
                Mail::to($subscriber)->queue(new NewArticlePublished($article, $subscriber));
            }
        }

        $endTime = microtime(true);

        logger('Command Succeeded in ' . ($endTime - $startTime) . ' second(s).');

    }
}