Ruby On Rails：如何從 POST 請求中提取嵌套參數

Question

我想從使用 POST 表單提交的params哈希中獲取鍵id和quantity的值。

參數：

params
# => {...
     "form"=>
      {"name"=>"joe",
       "date_sent"=>"09/28/2016",
       "emp_num"=>"54552452",
       "items_attributes"=>{"1474227471986"=>{"id"=>"3", "quantity"=>"5", "_destroy"=>"false"}, "1474227474062"=>{"id"=>"4", "quantity"=>"3", "_destroy"=>"false"}},
       "comments"=>"af",
       "accepted"=>"false"},
     "commit"=>"Submit",
     "m"=>"true"}

Answer 1

通過以下方式，您可以獲取所有嵌套項目屬性的id和數量。

params['form']['items_attributes'].values.collect { |value| { id: value['id'], quantity: value['quantity'] } }

輸出：

[ {:id => 3, :quantity => 5 }, { :id => 4, :quantity => 3 } ]