如何设置form_for select的默认值

问题描述

我想知道如何在form_for select上设置默认值.

I would like to know how to set default value on form_for select.

我的代码如下:

<%= form_for(@user) do |f| %>
 .
 .
 .

 <div class="field">
 <%= f.select(:user_group_id, options_for_select(@user_groups.collect {|p| [ p.name, p.id ] },   "Select Category")) %>
 </div>
<%= end %>

显然，它将返回字段user_group的所有值.在我的编辑页面上，我想将默认值设置为用户在user_group中具有的任何值.请帮助

Obviously it would return all the values of the field user_group. On my edit page, I would like to set the default value to whatever value the user have in the user_group. Pls help

推荐答案

您可以将第二个选项传递给options_for_select，该选项指示所选的值.

You can pass a second option to options_for_select that indicates the selected value.

options_for_select(@user_groups.collect { |p| [p.name, p.id] }, @user.user_group)

很明显，我不确定如何设置模型，但如有必要，可以使用查找以找到所需的条目.

Obviously I'm not sure how your models are set up, but if necessary you use a method like find to locate the entry you want.

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