相关疑难解决方法(0)

在Ruby on Rails中制作与某个问题相关的复选框的正确方法是什么？目前我有:

<div class="form_row">
    <label for="features[]">Features:</label>
    <br><%= check_box_tag 'features[]', 'scenarios' %> Scenarios
    <br><%= check_box_tag 'features[]', 'role_profiles' %> Role profiles
    <br><%= check_box_tag 'features[]', 'private_messages' %> Private messages
    <br><%= check_box_tag 'features[]', 'chatrooms' %> Chatrooms
    <br><%= check_box_tag 'features[]', 'forums' %> Forums
    <br><%= check_box_tag 'features[]', 'news' %> News
    <br><%= check_box_tag 'features[]', 'polls' %> Polls
</div>

我还希望能够自动检查以前选择的项目(如果重新加载此表单).如何将参数加载到这些的默认值？