baoshi-was/database/seeds/OwnerBillReportTableSeeder.php

<?php

use App\OwnerBillReport;
use Illuminate\Database\Seeder;

class OwnerBillReportTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
//        OwnerBillReport::query()->truncate();
        $owners = \App\Owner::query()->get();
        foreach ($owners as $owner) {
            factory(OwnerBillReport::class)->create([
                'owner_id' => $owner->id,
                'counting_month' => now()->subMonth()->startOfMonth()->toDateString(),
            ]);
        }
    }
}