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我正在尝试更新theme_name使用Best In Place. 但是，目前它会引发错误：

NoMethodError (undefined method `position_was' for #<Fruit:0x000000037e80a8>):
  app/controllers/fruits_controller.rb:18:in `update'

我有一个名为的资源fruit和一个名为theme. fruit属于theme并theme拥有许多fruit. 通过fruit使用 getter 和 setter 方法设置主题：

#fruit.rb
  def theme_name
    theme.try(:name)
  end

  def theme_name= name
    self.theme = Theme.find_or_create_by(name: name) if name.present?
    self.theme.conversation_id = self.conversation_id
  end

我现在还提到themes 和fruit属于conversation。fruit资源acts_as_list。_

这是中的更新操作fruits_controller.rb，它只响应 JSON

  def update
    @fruit = Fruit.find(params[:id])
    @fruit.update_attributes(fruit_params)

    respond_with_bip(@fruit)
  end

使用best_in_place更新我得到错误。以下是开发控制台的完整输出：

Started PUT "/fruits/12" for 127.0.0.1 at 2013-12-03 20:32:57 +0000
Processing by FruitsController#update as JSON
  Parameters: {"fruit"=>{"theme_name"=>"Candy"}, "authenticity_token"=>"UdsIgUglpPjkD5PS64PCxV9JyJFLlNxrO3tg8E9oe8o=", "id"=>"12"}
  Fruit Load (0.3ms)  SELECT "fruits".* FROM "fruits" WHERE "fruits"."id" = ? LIMIT 1  [["id", "12"]]
   (0.1ms)  begin transaction
  Theme Load (0.1ms)  SELECT "themes".* FROM "themes" WHERE "themes"."name" = 'Candy' LIMIT 1
  SQL (0.7ms)  INSERT INTO "themes" ("created_at", "name", "updated_at") VALUES (?, ?, ?)  [["created_at", Tue, 03 Dec 2013 20:32:57 UTC +00:00], ["name", "Candy"], ["updated_at", Tue, 03 Dec 2013 20:32:57 UTC +00:00]]
  SQL (0.4ms)  UPDATE "fruits" SET "theme_id" = ?, "updated_at" = ? WHERE "fruits"."id" = 12  [["theme_id", 1], ["updated_at", Tue, 03 Dec 2013 20:32:57 UTC +00:00]]
   (0.2ms)  rollback transaction
Completed 500 Internal Server Error in 31ms

NoMethodError (undefined method `position_was' for #<Fruit:0x000000037e80a8>):
  app/controllers/fruits_controller.rb:18:in `update'

任何投入将不胜感激。如果我未能在任何地方解释自己，请告诉我，以便我修改！

编辑：

这是github 页面的链接以获取上下文。

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1 回答 1

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这是因为没有“位置”列。我正在使用排名。act_as_list调用应该是这样的：

acts_as_list column: :rank, scope: :conversation
于 2013-12-18T22:47:47.767 回答