Using a Progress Bar while Seeding a database in Laravel

Your code isn't working because you're using $this->output in the wrong class. If you take a look again to the article you shared, $this-output is used in an Artisan command class.

In fact, every Artisan command is made with the Symfony Console component.

You're actually trying to use it in a database seeder :)

My suggestion: build your seeders and then call them with an "install" or "seed" customized command for your needs.

Here is my implementation code,

<?php

use Illuminate\Database\Seeder;

class MediaTypeTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $media_types = [
            ['name'=>'movie'],
            ['name'=>'channel'],
            ['name'=>'drama'],
            // ['name'=>'ebook'],
            // ['name'=>'shopping'],
            // ['name'=>'reseller'],
            // ['name'=>'broadcasting']
        ];
        $this->command->getOutput()->progressStart(count($media_types));
        App\Models\Backoffice\MediaType::query()->delete();
        foreach($media_types as $media_type){
            App\Models\Backoffice\MediaType::create($media_type);
            $this->command->getOutput()->progressAdvance();
        }
        $this->command->getOutput()->progressFinish();
    }
}

You can get access to output through $this->command->getOutput()

public function run()
{
    $this->command->getOutput()->progressStart(10);
    for ($i = 0; $i < 10; $i++) {
        sleep(1);
        $this->command->getOutput()->progressAdvance();
    }
    $this->command->getOutput()->progressFinish();
}