Question

我有collections_select：

collection_select(:building, :room_id, Room.all, :id, :name, prompt: true)：

<select name="building[room_id]">
  <option value="">Please select</option>
  <option value="1" selected="selected">Room A</option>
  <option value="2">Room B</option>
  <option value="3">Room C</option>
</select>

我希望:name和:number作为选项标记的文字：

<select name="building[room_id]">
  <option value="">Please select</option>
  <option value="1" selected="selected">Room A - 101</option>
  <option value="2">Room B - 102</option>
  <option value="3">Room C -103</option>
</select>

Answer 1

所以创建方法并使用它来代替名称

collection_select(:building, :room_id, Room.all, :id, :name_with_number, prompt: true)

其中name_with_number是您的方法，如

class Room < ActiveRecord::Base
  def name_with_number
     "#{name} #{id}" #or whatever
   end
end

更多详情http://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/collection_select

Answer 2

在room.rb模型中，添加一个方法来连接两个字段。

def name_with_number
  name << " - " << number
end

然后将您的collection_select更新为：

collection_select(:building, :room_id, Room.all, :id, :name_with_number, prompt: true)

祝你好运！

显示collections_select选项文本的连接文本

2 个答案: