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？现在我有：
<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>
我也想能够自动检查先前选择的项目(如果此表单被重新加载).我将如何将参数加载到这些默认值？
解决方法
您正在查看以下内容：
<div class="form_row">
<label for="features[]">Features:</label>
<% [ 'scenarios','role_profiles',...,'polls' ].each do |feature| %>
<br><%= check_Box_tag 'features[]',feature,(params[:features] || {}).include?(feature) %>
<%= feature.humanize %>
<% end %>
</div>
虽然如果您已经拥有Feature模型,功能表和has_many：features关系,您可能希望这样做：
<div class="form_row">
<label for="feature_ids[]">Features:</label>
<% for feature in Feature.find(:all) do %>
<br><%= check_Box_tag 'feature_ids[]',feature.id,@model.feature_ids.include?(feature.id) %>
<%= feature.name.humanize %>
<% end %>
</div>