ruby-on-rails - 如何从 Rails 4 中的表单发送哈希数组

Question

我正在尝试从我的参数中获取对象数组，寻找如下所示的内容:

"invoice"=>{"items"=>[{"description"=>"[no description]", "units"=>"0", "rate"=>"0"}, {"description"=>"[no description]", "units"=>"0", "rate"=>"0"}]}

我正在这样设置我的表单:

<input type="hidden" name="invoice[invoice_items][description]" />
<input type="hidden" name="invoice[invoice_items][units]"/>
<input type="hidden" name="invoice[invoice_items][rate]" />

输入是动态添加的，因此每个对象有 3 个组；在 Rails 中从表单发送对象数组的正确方法是什么？

该表单请求的结果如下所示:

"invoice"=>{"items"=>{"description"=>"[no description]", "units"=>"0", "rate"=>"0"}}

即使我添加更多项目，第一个项目总是有一个哈希

Answer 1

尝试添加方括号:

<input type="hidden" name="invoice[items][][description]">
<input type="hidden" name="invoice[items][][units]">
<input type="hidden" name="invoice[items][][rate]">

Rails 会将这些参数解析为:

"invoice" => {
  "items"=> [
    { "description" => "", "units" => "", "rate" => "" },
    { "description" => "", "units" => "", "rate" => "" }
  ]
}