排名模型拖放

Question

正在尝试实现rankmodel宝石提供的拖放特性，似乎做得不对，因为每次单击链接时，show mwthod都会引发错误

  

找不到ID =“ row_order_id”的评估，

注意：这些项目已经在有序列表中，我只需要添加拖放功能即可。

item.rb

class Item < ApplicationRecord
belongs_to :assessment

include RankedModel
ranks :row_order, with_same: :assessment_id

validates :title, presence: true
end

routes.rb

resources :assessments do
 post :update_row_order, on: :collection
end

assessments_controller

class AssessmentsController < ApplicationController
  # Display all assessments

  def index
    @assessments = current_user.visible_assessments
  end

  def show
    @assessment = Assessment.find(params[:id])
    @items = @assessment.items.rank(:row_order).all
  end

  def create
    @assessment = Assessment.new(assessment_params)

    if @assessment.save
      render json: @assessment, status: :created
    else
      render json: @assessment.errors, status: :unprocessable_entity
    end
  end

  def update_row_order
   @item = Item.find(params[:item])
   @item.row_order_position = params[:item]
   @item.save
   render nothing: true   
  end

  private
  def assessment_params
    params.require(:assessment).permit(:name)
  end
end

javascript

$.ajax({
  type: 'POST',
  url: '/assessments/update_row_order',
  dataType: 'json',
  data: { item: { row_order_position: 0 } }
});