public function firstActivePrinciple_withRecommendations()
 {
     //$active_principles = ActivePrinciple::All();
     $active_principles = ActivePrinciple::where("principio_activo", "=", "paracetamol")->orWhere("principio_activo", "=", "Ibuprofeno")->orWhere("principio_activo", "=", "Acido Acetil Salicilico")->get();
     $response = array();
     foreach ($active_principles as $activePrinciple) {
         $row = array('active_principle' => $activePrinciple->toArray(), 'recommendations' => ActivePrinciple::find($activePrinciple->id)->recommendations->toArray());
         array_push($response, $row);
     }
     return Response::json($response);
 }