Laravel 5 : passing a Model parameter to the middleware

Question

I would like to pass a model parameter to a middleware. According to this link (laravel 5 middleware parameters) , I can just include an extra parameter in the handle() function like so :

 public function handle($request, Closure $next, $model)
 {
   //perform actions
 }

How would you pass it in the constructor of the Controller? This isn't working :

public function __construct(){
    $model = new Model();
    $this->middleware('myCustomMW', $model);
}

**NOTE : ** it is important that I could pass different Models (ex. ModelX, ModelY, ModelZ)

Answer 1

First of all make sure that you're using Laravel 5.1. Middleware parameters weren't available in prior versions.

Now I don't believe you can pass an instantiated object as a parameter to your middleware, but (if you really need this) you can pass a model's class name and i.e. primary key if you need a specific instance.

In your middleware:

public function handle($request, Closure $next, $model, $id)
{
    // Instantiate the model off of IoC and find a specific one by id
    $model = app($model)->find($id);
    // Do whatever you need with your model

    return $next($request);
}

In your controller:

use App\User;

public function __construct()
{
    $id = 1; 
    // Use middleware and pass a model's class name and an id
    $this->middleware('myCustomMW:'.User::class.",$id"); 
}

With this approach you can pass whatever models you want to your middleware.