Rails 4 选择不显示选择 [英] Rails 4 Select Not Displaying Selected

问题描述

这是一个简短的.我有一个用于创建和编辑组的表单中的选择框.它有效，将选定的选项保存到数据库中，但表单不显示数据库中的内容，它始终显示第一个选项.

This is a short one. I have a select box that is in a form used to create and edit a group. It works, saves the selected option to the database, but the form does not display what is in the database, it always shows the first option.

<%= form_for @group, :html => {:multipart => true} do |f| %>
  <%= f.select :privacy, options_for_select([["Public", "Public"], ["Private", "Private"]],  @group.privacy), {}, {:class => 'form-control'} %>
  <%= f.submit :class => 'btn btn-primary' %>
<% end %>

我也试过:

<%= f.select :privacy, options_for_select([["Public", "Public"], ["Private", "Private"]], :selected => @group.privacy), {}, {:class => 'form-control'} %>

同样，保存数据但不显示所选选项.

Again, that save the data but does not display the selected option.

感谢您提供的任何帮助.

Thanks for any help you can offer.

推荐答案

<%= f.select :privacy, options_for_select([["Public", "Public"], ["Private", "Private"]], :selected => f.object.privacy), {}, {:class => 'form-control'} %>

试试这个

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