what is the right way (if any) to use the slim container on a non controller class - slim

Question

I have an isolated class file that is outside of a slim controller or cycle:
class UserModel
{
public function getSingleUser( string $field, $value )
{
return ( new DbSql )->db()->table( 'users' )->where( $field, $value )->first();
}
}
I want to replace the instantiation of the DbSql class by access to this service that is also registered in the slim container.
Question:
1) How do I access the slim container from this class?
2) I didn't see such example in the doc, is it something that should be avoided? Should I avoid accessing slim container from outside slim controller ?

Answer 1

I didn't see such example in the doc
Thats probably because the container is a dependency from Slim -> Pimple
Should I avoid accessing slim container from outside slim controller ?
No, actually the container should be used for constructing all objects
How do I access the slim container from this class
You shouldn't access the DI-Container in the class. Rather the container should inject the needed instances in the constructor.
So first, when you havn't already done this add DbSql to the container:
$app = \Slim\App();
$container = $app->getContainer();
$container['DbSql'] = function($c) {
return new DbSql();
};
Then add the UserModel to the container and add DbSql as constructor parameter
$container['UserModel'] = function($c) {
return new UserModel($c['DbSql']);
};
Add a constructor to the UserModel
class UserModel {
private $dbSql;
public function __construct(DbSql $dbSql) {
$this->dbSql = $dbSql;
}
public function getSingleUser( string $field, $value ) {
return $this->dbSql->db()->table( 'users' )->where( $field, $value )->first();
}
}
Now you can get the UserModel from the container
$userModel = $container['UserModel'];
$user = $userModel->getSingleUser('name', 'jmattheis');