Im having trouble understanding how dependency injection actually works, or how to properly use it

1

Hi!

So I have been trying to build myself an boilerplate with Slim3. And actually, I’m pretty surprised that it is going so smooth, until now.

I want too adapt the MVC design pattern, but due to that I’m having trouble to inject the models into the app. (I think)

So far I can do everything in the controller, that is injected like this, but when trying to use for example $this->pdo from a model, I’m receiving Notice: Undefined property.

When using Eloquent, this is works fine. No need for extra “injection”.

So how to I use a MVC design pattern with slim?

my slim repo

2

Unless I’m misunderstanding something here, there is no need to get $pdo when using eloquent. You can just do the following

class Users extends Model
{
    ...
}

and then use eloquent in your model code without every having to worry about using PDO. This is all abstracted away in Eloquent.

Hope this helps.

3

Thanks for your reply! But I’m not using Eloquent.

Its a PDO (FluentPDO) instance I’m trying to use.

4

You need to define pdo in the container like so…

$container = $app->getContainer();
$container['pdo'] = function ($c) {
    return new \PDO(....);
};

$app->get('/test', function ($req, $res, $args) {
    $this->pdo //do something with pdo
    return $res->write("woo hoo");
});