1

我有一个有效的实现，我有一个父资源MultipleChoiceQuestion，称为 aUser可以有很多。

MultipleChoiceQuestion有几个属性，从question（即问题本身）开始，以及它的答案选择属性，即answer_one, answer_two, answer_three, answer_four,answer_five和answer_correct

我需要能够将问题与所有答案选项一起显示，并让用户选择一个答案，将其保留，并允许他们查看他们回答对或错的问题。

我在想必须制作一个新模型UserAnswer，但我不确定它的属性应该是什么，考虑到它将属于MultipleChoiceQuestion- 以及如何将参数传递给这个新模型是我被卡住的上。

以下是相关代码：

MultipleChoiceQuestions 控制器

  def tagged
    @mcqs = MultipleChoiceQuestion.with_tag(params[:tag]).order("created_at DESC").paginate(:page => params[:page], :per_page => 1)
    authorize @mcqs
  end

def verify_user_selected_answer
    @multiple_choice_question = MultipleChoiceQuestion.find(params[:question])
    @selected_answer = params[:answer]
    @user_id_who_selceted = params[:current_user]


    if @selected_answer.downcase == @multiple_choice_question.answer_correct.downcase
      @result = "Correct answer!"
    else
      @result = "Wrong answer!"
    end

    respond_to do |format|
      format.json { render json: { result: @result } }
    end
  end

标记的.html.erb

  <% @mcqs.each do |mcq| %>
<% mcq.answers.each do |answer| %>
    <div class="gr-question--choice">
      <%= link_to answer, "javascript:void(0);", class: "answer" %>

    </div>

  <% end %>

<script>

$(document).ready(function() {
$("a.answer").on( "click", function( event ) {
var current_answer = $(this);
var question_id = '<%= mcq.id %>';
var current_user = "<%= current_user.id %>";

$.ajax({
url: "/verify_user_selected_answer",
type: "POST",
dataType: "json",
data: {user_id: current_user, question: question_id, answer: current_answer.text()},
success: function(response){
$("#display_result").text(response["result"]);
}
});
});
});

</script>

<% end %>

路线.rb

  post '/verify_user_selected_answer', to: "multiple_choice_questions#verify_user_selected_answer"

在 Rails 控制台中，正在传递数据参数，这就是证明

Started POST "/verify_user_selected_answer" for 127.0.0.1 at 2018-10-19 16:15:16 +0500
Processing by MultipleChoiceQuestionsController#verify_user_selected_answer as JSON
  Parameters: {"user_id"=>"1", "question"=>"77", "answer"=>"answer four"}

它具有尝试它的用户 ID、问题 ID 以及选择的答案。我需要在一个单独的模型中坚持这些尝试，但这必须通过 Ajax 来完成。

基本上，为了能够看到有多少人尝试了任何一个问题，谁选择了什么选择，并且用户自己应该能够随着时间的推移看到他们做对了哪些是错的，这就是我寻求帮助的原因- 谢谢！ ！

编辑：

多项选择题.rb

# == Schema Information
#
# Table name: multiple_choice_questions
#
#  id                                         :bigint(8)        not null, primary key
#  question                                   :text
#  answer_one                                 :text
#  answer_two                                 :text
#  answer_three                               :text
#  answer_four                                :text
#  answer_correct                             :text
#  answer_explanation                         :text
#  published                                  :boolean
#  flagged                                    :boolean
#  user_id                                    :bigint(8)
#  created_at                                 :datetime         not null
#  updated_at                                 :datetime         not null
#  slug                                       :string           not null


class MultipleChoiceQuestion < ApplicationRecord
  belongs_to :user, optional: true
  validates :user, presence: true

  belongs_to :multiple_choice_question_classification, optional: true

  has_many :flags, dependent: :destroy

  acts_as_taggable

  # activity feed
  include PublicActivity::Model
  tracked owner: Proc.new { |controller, model| controller.current_user ? controller.current_user : nil }

  extend FriendlyId
  friendly_id :question, use: %i(slugged history finders)

  def should_generate_new_friendly_id? #will change the slug if the name changed
    question_changed?
  end

  def answers
    [answer_one, answer_two,
    answer_three, answer_four,
    answer_correct].shuffle
  end


end

用户.rb 

# == Schema Information
#
# Table name: users
#
#  id                     :bigint(8)        not null, primary key
#  email                  :string           default(""), not null
#  encrypted_password     :string           default(""), not null
#  reset_password_token   :string
#  reset_password_sent_at :datetime
#  remember_created_at    :datetime
#  sign_in_count          :integer          default(0), not null
#  current_sign_in_at     :datetime
#  last_sign_in_at        :datetime
#  current_sign_in_ip     :string
#  last_sign_in_ip        :string
#  created_at             :datetime         not null
#  updated_at             :datetime         not null
#  first_name             :string
#  last_name              :string
#  school_name            :string
#  graduation_year        :string
#  current_sign_in_token  :string
#  admin                  :boolean          default(FALSE)
#  superadmin             :boolean          default(FALSE)
#  verified               :boolean          default(FALSE)
#  premiumuser            :boolean          default(FALSE)
#  banneduser             :boolean          default(FALSE)
#  user_role              :boolean          default(TRUE)
#  username               :string           default(""), not null
#

class User < ApplicationRecord
  has_many :multiple_choice_questions, dependent: :destroy
  has_many :comments, dependent: :destroy
  has_many :verbal_questions

  has_many :flags
  has_many :saved_items

  has_many :reviews



end
4

1 回答 1

1

您的问题可以通过经典has_many, <> :through关联来解决。这些步骤应包括以下内容

脚步：

1）生成一个新模型，UserAnswer用下面的命令说

rails g generate model UserAnswer user_id:integer multiple_choice_question_id:integer selected_answer:text is_correct_answer:boolean

并rake db:migrate在数据库中添加表。

2）删除表中的user_id列multiple_choice_questions。你现在不需要

3) 更改关联以包含新模型

#multiple_choice_question.rb
has_many :user_answers
has_many :users, through: :user_answers

#user.rb
has_many :user_answers
has_many :multiple_choice_questions, through: :user_answers

#user_answer.rb
belongs_to :user
belongs_to :multiple_choice_question

user_answers4）在下面的verify_user_selected_answer方法中添加条目的创建

def verify_user_selected_answer
  @multiple_choice_question = MultipleChoiceQuestion.find(params[:question])
  @selected_answer = params[:answer]
  @user_id_who_selceted = User.find(params[:user_id]) #look for the change here

  if @selected_answer.downcase == @multiple_choice_question.answer_correct.downcase
    UserAnswer.create(multiple_choice_question_id: @multiple_choice_question.id, user_id: @user_id_who_selceted.id, selected_answer: @selected_answer, is_correct_answer: true)
    @result = "Correct answer!"
  else
    UserAnswer.create(multiple_choice_question_id: @multiple_choice_question.id, user_id: @user_id_who_selceted.id, selected_answer: @selected_answer, is_correct_answer: false)
    @result = "Wrong answer!"
  end

  respond_to do |format|
    format.json { render json: { result: @result } }
  end
end

这将允许您user_answers在每次用户为问题选择答案时添加新条目。

于 2018-10-19T11:38:11.313 回答