Question

我创建了user-＆gt; posts-＆gt;评论关联，但评论无法正常工作。当我评论帖子时，评论保存到数据库，列user_id被记录（确定），但列post_id为空

有部分_post_list.html.erb

<% @posts.each do |post| %>
    <tr>
      <td><%= post.title %></td>
      <td><%= post.content %></td>
      <%= render 'shared/comment' %>
      <%= post.user.name %>
      </tr></br></br>
      <% end %>

有部分_comment.html.erb

<%= form_for(@comment) do |f| %>
<%= f.text_area :body %><br><br>
<%= f.submit "commented" %>
<% end %>

controller comments_controller

class CommentsController < ApplicationController
    def new
        @comment = Comment.new
    end

    def create
        @comment = current_user.comments.build(comment_params)
        if @comment.save
            redirect_to root_url
        else
            render 'static_pages/home'
        end
    end

     private

    def comment_params
      params.require(:comment).permit(:body)
    end
end

UPD 有服务器日志

Started POST "/posts/6/comments" for 127.0.0.1 at 2014-11-16 23:28:26 +0300
Processing by CommentsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"ZvyHKxSdH0a1rf79yaWmo9N/pD9/YhSQ9Ek8bdMLhOI=", "comment"=>{"body"=>"stackoverflow"}, "commit"=>"commented", "post_id"=>"6"}
  User Load (4.9ms)  SELECT  "users".* FROM "users"  WHERE "users"."remember_token" = 'b52623cb00671708536fce96c310b5d365128880' LIMIT 1
   (0.2ms)  begin transaction
  SQL (0.6ms)  INSERT INTO "comments" ("body", "created_at", "updated_at", "user_id") VALUES (?, ?, ?, ?)  [["body", "stackoverflow"], ["created_at", "2014-11-16 20:28:26.544500"], ["updated_at", "2014-11-16 20:28:26.544500"], ["user_id", 5]]
   (131.7ms)  commit transaction
Redirected to http://localhost:3000/
Completed 302 Found in 152ms (ActiveRecord: 137.4ms)


Started GET "/" for 127.0.0.1 at 2014-11-16 23:28:26 +0300
Processing by StaticPagesController#home as HTML
  User Load (0.4ms)  SELECT  "users".* FROM "users"  WHERE "users"."remember_token" = 'b52623cb00671708536fce96c310b5d365128880' LIMIT 1
  Rendered shared/_post_form.html.erb (2.4ms)
  Post Load (0.4ms)  SELECT "posts".* FROM "posts"   ORDER BY created_at DESC
  Rendered shared/_comment.html.erb (1.8ms)
  User Load (0.3ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = ? LIMIT 1  [["id", 5]]
  Rendered shared/_comment.html.erb (2.8ms)
  User Load (0.2ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = ? LIMIT 1  [["id", 1]]
  Rendered shared/_comment.html.erb (4.0ms)
  CACHE (3.1ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = ? LIMIT 1  [["id", 1]]
  Rendered shared/_comment.html.erb (1.5ms)
  CACHE (0.0ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = ? LIMIT 1  [["id", 1]]
  Rendered shared/_comment.html.erb (2.9ms)
  CACHE (0.0ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = ? LIMIT 1  [["id", 1]]
  Rendered shared/_post_list.html.erb (45.3ms)
  Rendered static_pages/home.html.erb within layouts/application (52.1ms)
  Rendered layouts/_header.html.erb (1.2ms)
Completed 200 OK in 364ms (Views: 347.0ms | ActiveRecord: 4.5ms)

controller static_pages_controller class StaticPagesController＆lt; ApplicationController的 def指数端

    def show
    end

    def home
    @post = current_user.posts.build 
    if signed_in?
    end
    @posts = Post.all
    @comment = current_user.comments.build
    end

end

查看home.html.erb

<%= render 'shared/post_form' %>
<%= render 'shared/post_list' %>

怎么修复？抱歉我的英文不好

Answer 1

您远未显示足够的代码，以便我们了解可能发生的情况。但我觉得很奇怪，你的表单不包含对post.id的引用，或者你为post对象标识的名称。

控制器只能使用：

表单的输入字段（此处为评论文本）
会话存储值（用户ID）

如果当前的帖子ID既不在表单字段中，也不在会话中，则控制器不会获取id，也不能将其存储在数据库中。

Answer 2

看起来您正在遍历所有帖子并在同一页面上为每个帖子创建评论表单。您可能希望将评论路由设置为嵌套资源，方法是将其包装在post资源中。

# config/routes.rb
resources :posts do
  resources :comments
end

将你的@post对象传递给部分，如：

<%= render 'shared/comment', post: post %>

然后您应该可以像这样创建评论表单：

<%= form_for([post,@comment]) do |f| %>
<%= f.text_area :body %><br><br>
<%= f.submit "commented" %>
<% end %>

通过添加post，您正在告知评论它属于哪个帖子。如果您正在使用它们，请不要忘记更新控制器中的强参数。

编辑：根据您的更新，您需要将:post_id添加到控制器底部的许可证中。

为什么评论不起作用

2 个答案: