ruby-on-rails - 显示 collections_select 选项文本的串联文本

Question

我有一个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>

我希望将 :name 和 :number 作为选项标记的文本:

<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

在您的 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!