Question

当我使用隐藏字段

时，我获得了nil值

<%= form_for @hour do |f| %>
  <%= f.hidden_field "days[]", :value => "Sunday" %>
  <%= f.hidden_field "days[]", :value => "Monday" %>
  <%= f.hidden_field "days[]", :value => "Tuesday" %>
  <%= f.hidden_field "days[]", :value => "Wednesday" %>
  <%= f.hidden_field "days[]", :value => "Thursday" %>
  <%= f.hidden_field "days[]", :value => "Friday" %>
  <%= f.hidden_field "days[]", :value => "Saturday" %>
<% end %>

我的参数：

"days"=>[nil,nil,nil,nil,nil,nil,nil]

我做隐藏的字段错了吗？

由于

Answer 1

检查以下代码是否有帮助。

<%= form_for @hour do |f| %>
  <%= f.hidden_field "days[0]", :value => "Sunday" %>
  <%= f.hidden_field "days[1]", :value => "Monday" %>
  <%= f.hidden_field "days[2]", :value => "Tuesday" %>
  <%= f.hidden_field "days[3]", :value => "Wednesday" %>
  <%= f.hidden_field "days[4]", :value => "Thursday" %>
  <%= f.hidden_field "days[5]", :value => "Friday" %>
  <%= f.hidden_field "days[6]", :value => "Saturday" %>
<% end %>

PARAMS：

  Parameters: {"utf8"=>"√",authenticity_token"=>"m84ly0Ok8NWKzqv2ZGZvtP1tRoSZ3M0OlL7W5W5Pk+I=", 
"hour"=>{"days"=>{"0"=>"Sunday", "1"=>"Monday", "2"=>"Tuesday",
 "3"=>"Wednesday", "4"=>"Thursday", "5"=>"Friday", "6"=>"Saturday"}},
"commit"=>"Create hour "}

更新
动态：

<%= form_for @hour do |f| %>
 <%= f.hidden_field "days][", :value => "Sunday" %>
 <%= f.hidden_field "days][", :value => "Monday" %>
 <%= f.hidden_field "days][", :value => "Tuesday" %>
 <%= f.hidden_field "days][", :value => "Wednesday" %>
 <%= f.hidden_field "days][", :value => "Thursday" %>
 <%= f.hidden_field "days][", :value => "Friday" %>
 <%= f.hidden_field "days][", :value => "Saturday" %>
<% end %>

输出：

   Parameters: {"utf8"=>"√",  "authenticity_token"=>"jxCDmSoKjclXu4ySSWp/gW19Ejy4tY3NwdBW/l/+lRU=", "user"=>{"hour"=>["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]}, "commit"=>"Create Hour"}

Answer 2

为什么你需要在视图中使用隐藏字段来获取参数中的日期名称数组？

您可以在控制器中执行此操作：

params.merge!('days' => Date::DAYNAMES)

将在params中给你：

"days"=>["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]

或者，如果您需要hour哈希中的天数：

params['hour'].merge!('days' => Date::DAYNAMES)

或者，如果您需要本地化名称，而不是Date::DAYNAMES使用：

I18n.t(:'date.day_names')

Rails：在隐藏字段中获取nil值

2 个答案: