Question

我无法在button_to内完成任务。以下代码有什么问题？我收到错误消息missing required keys: [:callsign]。尝试1：

<%= button_to messages_user_path,
              callsign: @character.callsign,
              params: {
                recipient_callsign: notice.character.callsign
              },
              class: 'btn btn-default btn-xs post_button',
              id: 'message_envelope' do %>
  <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span>
<% end %>

这也会失败并显示相同的错误消息：尝试2：

<%= button_to messages_user_path(
                params: {
                  callsign: @character.callsign,
                  recipient_callsign: notice.character.callsign
                }
              ),
              class: 'btn btn-default btn-xs post_button',
              id: 'message_envelope' do %>
  <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span>
<% end %>

此版本显示该页面，但它不会隐藏recipient_callsign，这可以在网址中看到。这首先击败了使用button_to的对象，因为我不想在网址中使用recipient_callsign。为什么不隐藏recipient_callsign？尝试3：

<%= button_to messages_user_path(
                callsign: @character.callsign,
                params: {
                  recipient_callsign: notice.character.callsign
                }
              ),
              class: 'btn btn-default btn-xs post_button',
              id: 'message_envelope' do %>
  <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span>
<% end %>

Answer 1

<%= button_to 'Button text', messages_user_path(callsign: @character.callsign),
   class: 'btn btn-default btn-xs post_button',
   id: 'message_envelope',
   params: {
     recipient_callsign: notice.character.callsign
   }
  do %>
  <span class="glyphicon glyphicon-envelope" aria-hidden="true"></span>
<% end %>

首先让路径辅助方法分开：

messages_user_path(callsign: @character.callsign)

路径和网址助手采用哈希。除命名密钥之外提供的任何密钥都将添加到查询字符串中。

举个例子：

micropost_path(id: 6)    
=> "/microposts/6"
micropost_path(id: 6, foo: 'bar')
=> "/microposts/6?foo=bar"

button_to的签名基本上是：

<%= button_to 'text', action, options = {} %>

您可以使用params选项向表单添加输入。

{
  class: 'btn btn-default btn-xs post_button',
  id: 'message_envelope',
  params: {
     recipient_callsign: notice.character.callsign
   }
}

http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-button_to

Rails button_to不会隐藏参数

1 个答案: