Php Laravel-将元数据保存到多对多关系

我想保存这样一个食谱：

                $recipe = new Recipe;
            //$recipe->user_id = Auth::user()->id;
            $recipe->user_id = 40;
            $recipe->title = Input::get('title');
            $recipe->short_desc = Input::get('short_desc');
            $recipe->prep_time = Input::get('prep_time');
            $recipe->status = 0;
            $recipe->amount = Input::get('amount');
            $recipe->save();
            //$recipe->ingredients()->sync(Input::get('ingredients'));
            foreach(Input::get('ingredients') as $key => $ingredient) {
                $recipe->ingredients()->attach($key,['unit' => $ingredient['unit'], 'amount' => $ingredient['amount']]);
            }
            //$recipe->ingredients()->attach($ingredients->id,['unit' => $unit, 'amount' => $amount]);
            $recipe->categories()->sync(Input::get('categories'));
            $recipe->recipesteps()->sync(Input::get('description'));

            $recipe->push();
        //}
        return json_encode($recipe);  

我通过邮递员输入的数据：

因此，我的foreach似乎没有创建“成分”，它只是想添加它们

如何创建具有“ID”和“名称”的成分（在成分表中），并将元数据添加到数据透视表（单位和数量）

谢谢！明白了

             foreach(Input::get('ingredients') as $key => $i) {
                $ingredient = new Ingredients(array('name' => $i['name'],'unit' => $i['unit']));
                $ingredient->save();
                $recipe->ingredients()->attach($ingredient->id,['amount' => $i['amount']]);
            }  

->save（）不见了

             foreach(Input::get('ingredients') as $key => $i) {
                $ingredient = new Ingredients(array('name' => $i['name'],'unit' => $i['unit']));
                $ingredient->save();
                $recipe->ingredients()->attach($ingredient->id,['amount' => $i['amount']]);
            }