public function store(Request $request)
 {
     $ingredient = Ingredient::where('name', $request->get('name'))->first();
     if (!$ingredient) {
         $ingredient = new Ingredient();
         $ingredient->fill($request->all());
         $ingredient->save();
     }
     $ingredient->recipes()->attach($request->get('recipe_id'), ['quantity' => $request->get('quantity')]);
     return $ingredient;
 }