Ruby on rails 我能'；无法从多态关联中获取任何行

我已经在一个表上设置了2个多态关联，添加到表中没有问题，但似乎无法检索添加的信息

以下是我正在做的：

职位

使用者

团体

用户\u controller.rb

def post
    authorize @user
    @post = Post.new(post_params)

    @post.received = @user
    @post.posted = @current_user

    if @post.save
      respond_to do |format|
        format.html {redirect_to root_url}
        format.js
      end
    else
      respond_to do |format|
        format.html {redirect_to root_url}
        format.js
      end
    end
end

帖子看起来不错，但我应该能够通过使用

           <% @user.received_posts do |post| %>
                <%= post.content %>
            <% end %>


           <% @user.posted_posts do |post| %>
                <%= post.content %>
            <% end %>

---

结果发现您错过了

。每个
：

<% @user.posted_posts.each do |post| %>


这种安排应该有效。你确定数据库中有相关数据吗？是的，我使用rails控制台进行了确认。而且日志中根本没有提到posts表。。所以基本上，它甚至没有被请求。你能发布你的
服务器日志吗？试试：
？
def post
    authorize @user
    @post = Post.new(post_params)

    @post.received = @user
    @post.posted = @current_user

    if @post.save
      respond_to do |format|
        format.html {redirect_to root_url}
        format.js
      end
    else
      respond_to do |format|
        format.html {redirect_to root_url}
        format.js
      end
    end
end

           <% @user.received_posts do |post| %>
                <%= post.content %>
            <% end %>


           <% @user.posted_posts do |post| %>
                <%= post.content %>
            <% end %>

    Started GET "/!/David" for 127.0.0.1 at 2014-08-18 12:02:32 +0100
Processing by UsersController#show as HTML
Parameters: {"username"=>"David"}
User Load (0.3ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = 2  ORDER BY "users"."id" ASC LIMIT 1
User Load (0.2ms)  SELECT  "users".* FROM "users"  WHERE (username == 'David') LIMIT 1
(0.2ms)  SELECT COUNT(*) FROM "follows"  WHERE "follows"."followable_id" = ? AND "follows"."followable_type" = ? AND "follows"."blocked" = 'f'  [["followable_id", 3], ["followable_type", "User"]]
(0.2ms)  SELECT COUNT(*) FROM "follows"  WHERE "follows"."blocked" = 'f' AND "follows"."follower_id" = 2 AND "follows"."follower_type" = 'User' AND "follows"."followable_id" = 3 AND "follows"."followable_type" = 'User'
Rendered users/_links.html.erb (1.2ms)
Rendered users/show.html.erb within layouts/application (7.8ms)
Rendered layouts/_app_sidebar.html.erb (0.8ms)
Mailboxer::Conversation Load (0.6ms)  SELECT DISTINCT "mailboxer_conversations".* FROM "mailboxer_conversations" INNER JOIN "mailboxer_notifications" ON "mailboxer_notifications"."conversation_id" = "mailboxer_conversations"."id" AND "mailboxer_notifications"."type" IN ('Mailboxer::Message') INNER JOIN "mailboxer_receipts" ON "mailboxer_receipts"."notification_id" = "mailboxer_notifications"."id" WHERE "mailboxer_notifications"."type" = 'Mailboxer::Message' AND "mailboxer_receipts"."receiver_id" = 2 AND "mailboxer_receipts"."receiver_type" = 'User'  ORDER BY mailboxer_conversations.updated_at DESC
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CACHE (0.0ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = ? LIMIT 1  [["id", 2]]
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CACHE (0.0ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = ? LIMIT 1  [["id", 2]]
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Completed 200 OK in 223ms (Views: 206.2ms | ActiveRecord: 13.5ms)

<% @user.posted_posts.each do |post| %>