Rails 4 - 完成后评估模型 - 结构

Question

我仍然在使用 Rails。

我正在尝试向基于项目的应用程序添加评估功能。

我希望每个项目参与者在项目完成后提交评估。

我有一个评估模型：

评估.rb

# == Schema Information
#
# Table name: evaluations
#
#  id                :integer          not null, primary key
#  user_id           :integer
#  evaluatable_id    :integer
#  evaluatable_type  :string
#  overall_score     :integer
#  project_score     :integer
#  personal_score    :integer
#  remark            :text
#  work_again?       :boolean
#  continue_project? :boolean
#  created_at        :datetime         not null
#  updated_at        :datetime         not null
#
# Indexes
#
#  index_evaluations_on_evaluatable_type_and_evaluatable_id  (evaluatable_type,evaluatable_id) UNIQUE
#

class Evaluation < ActiveRecord::Base

  # --------------- associations

  belongs_to :evaluator, :polymorphic => true, class_name: 'Evaluation'
  belongs_to :evaluatable, :polymorphic => true, class_name: 'Evaluation'


  # --------------- scopes

  # --------------- validations

  # --------------- class methods

  # --------------- callbacks

  # --------------- instance methods

  # --------------- private methods

end

我担心：

module Evaluatable
    extend ActiveSupport::Concern

    included do 
        has_many :received_evaluations, as: :evaluatable, dependent: :destroy, class_name: 'Evaluation'
    end
end

module Evaluator
    extend ActiveSupport::Concern

    included do 
        has_many :given_evaluations, as: :evaluator, dependent: :destroy, class_name: 'Evaluation'

    end
end

然后我尝试将每个用户的评价（收到）显示为：

<% Evaluation.find(params[:id]).evaluation.order('created_at DESC').each do |eval| %>
                                <div id="portfolioFiltering" class="masonry-wrapper row">
                                        <%= eval.remark %>
                                        <%= eval.personal_score %>
                                        <small><%= eval.created_at %></small>
                                </div>    
                            <% end %>  

但我收到此错误：

undefined method `evaluations' for #<Evaluation:0x007ff274b13b90>
Did you mean?  evaluator
               evaluator=

我什至不确定我是否理解了错误消息，更不用说弄清楚该怎么办了。

谁能理解这条信息？

Answer 1

从你的关系中删除它

:polymorphic => true,

这是一篇我们应该使用多态关系的文章。 http://guides.rubyonrails.org/association_basics.html#polymorphic-associations