Ruby On Rails：如何從POST請求中提取嵌套參數

Question

我想從params哈希值中提取用POST表單提取的id和quantity密鑰的值。

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

在下面的方式，你可以抓住ID和數量的所有嵌套項屬性。

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

輸出：

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