ruby-on-rails-4 – 如何在窗体中使用Active Record Enum Radio Buttons？

在我的应用程序中,有一篇关于文章的评论部分.我希望用户能够使用3种不同的选项发表评论.要激活这个,我使用的是Active Record Enum.请注意,评论部分嵌套在文章之下.

resources :articles,only: [:index,:show] do
  resources :comments
end

移民：

class AddEnumToCommentModel < ActiveRecord::Migration
  def change
    add_column :comments,:post_as,:Integer,default: 0
  end
end

评论模特：

enum post_as: %w(username,oneliner,anonymous)

我尝试将其添加到内容视图,但丢失.我猜我也必须在我的控制器做某事,但不确定.

尝试查看：

<%= form_for([@article,@comment]) do |f| %>
  <% if @comment.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@comment.errors.count,"error") %> prohibited this comment from being saved:</h2>

      <ul>
      <% @comment.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <h3>Fill in your comment</h3>
    <%= f.label :content %><br>
    <%= f.text_area :content %>
  </div>

  <div class="post_as">
    <h3> Choose how you want to post your comment :</h3>
    <%= f.input :content,post_as: ???,as: :radio %>
  </div>

  <br>

  <div class="actions">
    <%= f.submit %>
  </div>

  <br>
<% end %>

<% Comment.post_as.keys.each do |post_as| %>
  <%= f.radio_button :post_as,post_as %>
  <%= f.label post_as.to_sym %>
<% end %>