snipe-it/database/seeders/CustomFieldSeeder.php

<?php

namespace Database\Seeders;

use App\Models\CustomField;
use App\Models\CustomFieldset;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Seeder;
use Illuminate\Support\Facades\Schema;

class CustomFieldSeeder extends Seeder
{
    public function run()
    {
        $columns = DB::getSchemaBuilder()->getColumnListing('assets');

        foreach ($columns as $column) {
            if (strpos($column, '_snipeit_') !== false) {
                Schema::table('assets', function (Blueprint $table) use ($column) {
                    $table->dropColumn($column);
                });
            }
        }
        CustomField::truncate();
        CustomFieldset::truncate();
        DB::table('custom_field_custom_fieldset')->truncate();

        CustomFieldset::factory()->count(1)->mobile()->create();
        CustomFieldset::factory()->count(1)->computer()->create();
        CustomField::factory()->count(1)->imei()->create();
        CustomField::factory()->count(1)->phone()->create();
        CustomField::factory()->count(1)->ram()->create();
        CustomField::factory()->count(1)->cpu()->create();
        CustomField::factory()->count(1)->macAddress()->create();

        DB::table('custom_field_custom_fieldset')->insert([
            [
                'custom_field_id' => '1',
                'custom_fieldset_id' => '1',
            ],
            [
                'custom_field_id' => '2',
                'custom_fieldset_id' => '1',
            ],
            [
              'custom_field_id' => '3',
              'custom_fieldset_id' => '2',
            ],
            [
              'custom_field_id' => '4',
              'custom_fieldset_id' => '2',
            ],
            [
              'custom_field_id' => '5',
              'custom_fieldset_id' => '2',
            ],

      ]);
    }
}