Laravel seed create wrong number of rows in DB - laravel

Question

I'm trying to create a seeder with relationships
public function run()
{
factory(Company::class, 10)->create()->each(function ($company){
$company->buildings()->saveMany(factory(Building::class, 5)->create()->each(function ($building){
$building->facilities()->saveMany(factory(App\Models\Facility::class,5)->make());
}));
});
}
That code should creeate 10 companies and 5 buildings for each company and 5 facilities for each building.
companies 10
buildings 50
facilities 250
but I get
companies 300
buildings 310
facilties 250
which doesn't make sense
my factories:
$factory->define(Company::class, function (Faker $faker) {
$name = $faker->lastName;
$company = $name.' Company';
return [
'name' => $company,
'shortName' => $name
];
});
$factory->define(Building::class, function (Faker $faker) {
return [
'name' => 'Hotel '.$faker->lastName,
'company_id' => function () {
return factory(App\Models\Company::class)->create()->id;
}
];
});
$factory->define(Facility::class, function (Faker $faker) {
$elements = array('lavabo','ducha');
return [
'name' => $faker->randomElement($elements).' '.$faker->numerify('Habitacion ###'),
'building_id' => function () {
return factory(App\Models\Building::class)->create()->id;
}
];
});
And the databaseSeeder.php
class DatabaseSeeder extends Seeder
{
/**
* Seed the application's database.
*
* #return void
*/
public function run()
{
$this->call(UserSeeder::class);
$this->call(CompaniesSeeder::class);
}
}

Answer 1

Solution
The problem comes from here:
$company->buildings()->saveMany(factory(Building::class, 5)->create()->each(function ($building){
$building->facilities()->saveMany(factory(App\Models\Facility::class,5)->make());
}));
Every time you create a new building, and facility, it is creating a new company in your factory as well.
Simply pass the appropriate parameters to your create function to let Faker know to not create new company and building.
Change from:
factory(Building::class, 5)->create()
To:
factory(Building::class, 5)->create(['company_id' => $company->id]);
And apply the same logic for Facility.
factory(App\Models\Facility::class,5)->make(['building_id' => $building->id])
Side note
You can also simplify your factories by replacing your callback function like this:
$factory->define(Building::class, function (Faker $faker) {
return [
'name' => 'Hotel '.$faker->lastName,
'company_id' => factory(Company::class),
];
});