ruby-on-rails - 如何在rails的收集方法中使用订单

Question

这是我的代码，我无法按 first_name 对名称进行排序

 <%= f.collection_select :donation_id, @donation_array,
      :id,  :dropdown_display,:order => ("first_name DESC"),
      :prompt => "Select Donation Detail", :include_blank => true %>

Answer 1

你不能这样订购，当你像这样拉donation_array时它就完成了

@donation_array = Donation.order('first_name DESC').all

并像这样创建您的收藏

<%= f.collection_select :donation_id, @donation_array,
      :id,  :dropdown_display,
      :prompt => "Select Donation Detail", :include_blank => true %>