Ruby on rails 简单形式的嵌套属性返回质量分配错误

型号：

当我填写并提交/posts/新表格时，终端显示：

def create
  topic_name = params[:post].delete(:topic)
  @topic = Topic.find_or_create_by_name(topic_name)
  @post = Post.new(params[:post])
  @post.topic = @topic
  respond_to do |format|
    if @post.save
      format.html { redirect_to(@post, :notice => 'Post was successfully created.') }
    else
      format.html { render :action => "new" }
    end
  end
end

---

我尝试将

：post_属性

添加到主题模型中的

attr_accessible

，但这并不能解决问题。可能是表单吗？

您不应该使用简单字段作为：主题吗

Started POST "/posts" for 127.0.0.1 at 2011-05-06 18:30:10 -0700
  Processing by PostsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"Gg2T18NRiYMe5UMReSfvwwiDTQSrjdnjiEdyDcP1MuI=", "post"=>{"name"=>"25", "title"=>"25", "content"=>"25", "topic"=>{"name"=>"25"}}, "commit"=>"Post"}
  Topic Load (0.2ms)  SELECT "topics".* FROM "topics" WHERE "topics"."name" = '25' LIMIT 1
  AREL (0.9ms)  INSERT INTO "topics" ("name", "created_at", "updated_at") VALUES ('25', '2011-05-07 01:30:10.237406', '2011-05-07 01:30:10.237406')
  Topic Load (0.7ms)  SELECT "topics".* FROM "topics" ORDER BY updated_at DESC
  AREL (0.8ms)  INSERT INTO "posts" ("name", "title", "content", "topic_id", "created_at", "updated_at") VALUES ('25', '25', '25', 25, '2011-05-07 01:30:10.406437', '2011-05-07 01:30:10.406437')
  AREL (0.3ms)  UPDATE "topics" SET "updated_at" = '2011-05-07 01:30:10.415141' WHERE "topics"."id" = 25
Redirected to http://0.0.0.0:3000/posts/25
Completed 302 Found in 281ms

---

这不是简单形式的错误。您应该将post_id添加到主题模型中可访问的属性中。该代码在控制台中也会失败。

我根据@monocle和@rafaelfranca的建议更新了代码，但仍然收到相同的错误。在做了这些更改之后，我确实重新启动了服务器，以防有人问我。谢谢你的帮助，我非常感激。

def create
  topic_name = params[:post].delete(:topic)
  @topic = Topic.find_or_create_by_name(topic_name)
  @post = Post.new(params[:post])
  @post.topic = @topic
  respond_to do |format|
    if @post.save
      format.html { redirect_to(@post, :notice => 'Post was successfully created.') }
    else
      format.html { render :action => "new" }
    end
  end
end

Started POST "/posts" for 127.0.0.1 at 2011-05-06 18:30:10 -0700
  Processing by PostsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"Gg2T18NRiYMe5UMReSfvwwiDTQSrjdnjiEdyDcP1MuI=", "post"=>{"name"=>"25", "title"=>"25", "content"=>"25", "topic"=>{"name"=>"25"}}, "commit"=>"Post"}
  Topic Load (0.2ms)  SELECT "topics".* FROM "topics" WHERE "topics"."name" = '25' LIMIT 1
  AREL (0.9ms)  INSERT INTO "topics" ("name", "created_at", "updated_at") VALUES ('25', '2011-05-07 01:30:10.237406', '2011-05-07 01:30:10.237406')
  Topic Load (0.7ms)  SELECT "topics".* FROM "topics" ORDER BY updated_at DESC
  AREL (0.8ms)  INSERT INTO "posts" ("name", "title", "content", "topic_id", "created_at", "updated_at") VALUES ('25', '25', '25', 25, '2011-05-07 01:30:10.406437', '2011-05-07 01:30:10.406437')
  AREL (0.3ms)  UPDATE "topics" SET "updated_at" = '2011-05-07 01:30:10.415141' WHERE "topics"."id" = 25
Redirected to http://0.0.0.0:3000/posts/25
Completed 302 Found in 281ms

simple_form_for @post do |f|
  f.simple_fields_for :topic do |topic_form|
    topic_form.input :name
  end
end