Rails:绑定到对象的嵌套表单 - 选择框出现问题

Question

我的Rails应用程序中有一个嵌套的表单模型.当我去编辑模型中的对象时,除了选择框之外,我的所有字段(text_area,check_box等)都填充了数据库中的数据.当我使用表单编辑模型中的现有数据时,如何让我的选择框也填充？

<%= form_for @test do |f| %>

  <%= f.fields_for :questions do |builder| %>
    <%= render 'question_fields', f: builder %>
  <% end %>

<% end %>

_question_fields.html.erb

<fieldset>

  <%= f.text_area :question_text %>

  <%= f.select :correct_answer, options_for_select([['A', 1], ['B', 2], ['C', 3], ['D', 4], ['E', 5]]), :prompt => 'Choose the correct answer' %>

  <%= f.check_box :question_check %>

</fieldset>

Answer 1

您需要在options_for_select函数调用中发送所选参数.

<%= f.select :correct_answer, options_for_select([['A', 1], ['B', 2], ['C', 3], ['D', 4], ['E', 5]], :selected => f.object.correct_answer), :prompt => 'Choose the correct answer' %>