Deriving multiple route params from one argument

Level 58

To achieve the desired functionality where you can call route('post.show', $post) and have the {organization} parameter automatically derived from the $post object, you can use Laravel's route model binding and custom URL generation logic. Here's a step-by-step solution:

Custom Route Key Binding:

First, ensure that your Post model has a relationship with the Organization model. Then, you can define a custom route key binding for the Post model to automatically include the organization in the URL.

In your RouteServiceProvider, you can override the boot method to define a custom binding:
```
use Illuminate\Support\Facades\Route;
use App\Models\Post;

public function boot()
{
    parent::boot();

    Route::bind('post', function ($value) {
        return Post::where('id', $value)->with('organization')->firstOrFail();
    });
}
```

Custom URL Generation Logic:

You can extend the UrlGenerator to customize how URLs are generated for your routes. This involves creating a custom service provider to override the default URL generator.

First, create a custom URL generator:

namespace App\Routing;

use Illuminate\Routing\UrlGenerator as BaseUrlGenerator;

class UrlGenerator extends BaseUrlGenerator
{
    public function route($name, $parameters = [], $absolute = true)
    {
        if (isset($parameters[0]) && $parameters[0] instanceof \App\Models\Post) {
            $post = $parameters[0];
            $parameters = [$post->organization_id, $post->id];
        }

        return parent::route($name, $parameters, $absolute);
    }
}

Register the Custom URL Generator:

In your AppServiceProvider or a custom service provider, bind your custom URL generator:

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Routing\UrlGenerator;

class AppServiceProvider extends ServiceProvider
{
    public function register()
    {
        $this->app->singleton('url', function ($app) {
            return new UrlGenerator($app['router']->getRoutes(), $app->rebinding(
                'request', $this->requestRebinder()
            ));
        });
    }

    protected function requestRebinder()
    {
        return function ($app, $request) {
            $app['url']->setRequest($request);
        };
    }
}

Update Your Routes:

Ensure your routes are defined to accept both {organization} and {post} parameters:
```
Route::get('/{organization}/post/{post}', [PostController::class, 'show'])->name('post.show');
```

With these changes, you should be able to call route('post.show', $post) and have the {organization} parameter automatically derived from the $post object. This approach keeps your route definitions clean and allows for easy integration into a package.

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