我如何在轨道上的 ruby 中获取参数作为数组？

Question

我的 controller 中有以下内容

    def invoice_params
      params.require(:invoice).permit({items: [:items]}, :price, :tax, :discount, :sum)
    end

在我的_form中

<td><input  size="8" <% form.text_field :items  %> /></td> [pants]
<td><input  size="8" <%= form.text_field :items %> /></td> [spoon]
<td><input  size="8" <%= form.text_field :items %>/></td>  [nil]
<td><input  size="8" <%= form.text_field :items  %> /></td> [nil]
<td><input  size="8"  /></td>

所以我希望我的数组像["pants","Spoon",nil,nil]

使用这种风格，我的服务器出现以下错误

Started POST "/invoices" for 10.0.2.1 at 2020-04-09 00:46:55 +0000
Cannot render console from 10.0.2.1! Allowed networks: 127.0.0.0/127.255.255.255, ::1
Processing by InvoicesController#create as HTML
  Parameters: {"authenticity_token"=>"94T3Stght1p9n9Bo44+lvS7CMnE5PEkuic5DP8ifYH4yxY5roVt19ZHpL6sIaiO31i/S5DADP+/ffNG3wdobLQ==", "invoice"=>{"items"=>"das", "tax"=>""}, "commit"=>"Create Invoice"}
**Unpermitted parameter: :items**

Answer 1

<input type="text" name="invoice[items][]" value="pants">
<input type="text" name="invoice[items][]" value="spoon">

将为您提供参数作为数组： { invoice: { items: ["pant", "spoon"] } }

<input type="text" name="invoice[items][1]" value="pants">
<input type="text" name="invoice[items][2]" value="spoon">

会给你的参数为 HASH: { invoice: { items: { "1": "pant", "2": "spoon" } } }

对于您的问题，您需要手动指定名称，如下所示：

<td><%= form.text_field name: "invoice[items][]" %> /></td>
<td><%= form.text_field name: "invoice[items][]" %> /></td>
<td><%= form.text_field name: "invoice[items][]" %> /></td>
<td><%= form.text_field name: "invoice[items][]" %> /></td>