Transaction doesn't work when instantiating eloquant from a class - laravel

Question

I try to use transactions OUTSIDE laravel. it works when I include the db instantiation right in my index file as is:
use Illuminate\Database\Capsule\Manager as Db;
$db = new Db;
$db->addConnection( [
'driver' => Settings::DATABASE_DRIVER,
'host' => Settings::DATABASE_HOST,
'database' => Settings::DATABASE_NAME,
'username' => Settings::DATABASE_USERNAME,
'password' => Settings::DATABASE_PASSWORD,
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => ''
] );
# Make this Capsule instance available globally via static methods... (optional)
$db->setAsGlobal();
I can then elsewhere use code like this:
Db::connection()->beginTransaction();
# Create blog post in the database and return its id
$blogPostRecordId = ( new BlogDbModel() )->create( $_POST );
Db::connection()-> rollBack();
it will correctly work and rollback: no row is created in db.
However, If I get an instance of the db from a class, it won't work:
class DbSql
{
/**
* Use the eloquent query builder and orm. Bypass PDO interface.
* #return Capsule
*/
public function db()
{
$capsule = new Capsule;
$capsule->addConnection( [
'driver' => Settings::DATABASE_DRIVER,
'host' => Settings::DATABASE_HOST,
'database' => Settings::DATABASE_NAME,
'username' => Settings::DATABASE_USERNAME,
'password' => Settings::DATABASE_PASSWORD,
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => ''
] );
# Make this Capsule instance available globally via static methods... (optional)
$capsule->setAsGlobal();
// Setup the Eloquent ORM... (optional; unless you've used setEventDispatcher())
//$capsule->bootEloquent();
return $capsule;
}
}
and then use
( new DbSql() )->db()->getConnection()->beginTransaction();
# Create blog post in the database and return its id
$blogPostRecordId = ( new BlogDbModel() )->create( $_POST );
( new DbSql() )->db()->getConnection()->rollBack();
it simply won't work and the transaction is ignored. Why does getting the db instance from a class instantiation make the process fail ? I would prefer to use an instance as needed.

Answer 1

Solution: the db instance must be exactly the same everywhere the transaction is needed:
$dbInstance = ( new DbSql() )->db();
Then use $dbInstance wherever the transaction is to be followed:
$dbInstance->connection()->beginTransaction();
as well as with any db eloquent operation. So pass the $dbInstance as needed. The good thing is that it can be anywhere in you code: in your models, controllers....
Then finish:
$dbInstance->connection()->commit();
If the system is not able to reach this last line, nothing will be committed to the db.