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f.select

1.基本用法
  <%= f.select   :rank, options_for_select(Archive::Ranks) %>
Archive::Ranks是数组 用%w构建即可
2. 在修改时反映数据库里的值

      <%= f.select   :rank, options_for_select(Archive::Ranks) %>
时,选择框里的值不正确
应如下:
档案类别<br />
    <%= f.select  :category, options_for_select(Archive::Categorys,:selected => [@archive.category]) %>

    <%= f.select :category, options_for_select(Archive::Categorys, :selected => [@archive.category]), {},:class => ‘form-control‘, ‘data-style‘ => "btn-primary"%>
要注意()号,也不能这样写:
<%= f.select  :category, options_for_select(Archive::Categorys),:selected => [@archive.category] %>