I'm trying to deepen my knowlade in laravel architecture.
I have a search engine (elastic search for the sake of the example), but this search engine might change in the future. So im trying to write a container for this, so in case i'll change the engine in the future, i will have to change only the container. (I believe the termenology is factory design?)
I have created a provider app/providers/DataFromSearchEngine.php that looks like this:
use Illuminate\Support\ServiceProvider;
class DataFromSearchEngine extends ServiceProvider {
public function boot()
{
//
}
public function register()
{
$this->app->singleton('SearchEngine', function($app) {
return new elasticSearch;
});
}
}
Then i registered it in the providers array in config/app.php .
'providers' => [
// providers...
'App\Providers\DataFromSearchEngine'
],
The next step is to call SearchEngine from my controller:
namespace App\Http\Controllers;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
class SearchController extends Controller {
protected $searchEngine;
public function __construct() {
$this->searchEngine = $this->app->make('SearchEngine');
}
}
But all these yields: Undefined property: App\Http\Controllers\SearchController::$app
Can someone explain what i'm missing?
Instead of using $this->app try using app().
This is because non of the inherited controller classes, i.e. App\Http\Controllers\Controller or Illuminate\Routing\Controllers\Controller have an app property on them.
As a note you can use app('SearchEngine') which is the equivalent of app()->make('SearchEngine') as a shortcut to making your object.
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