Question

我的Rails应用中有SaleQualifier个对象。每个人都会在SalesOpportunity展示页面上找到预先确定的（并通过YAML预加载）问题，然后构建答案sale_qualifier has_one answer。这两个项目都要保存到数据库中，之后我使用answer_type和answer_text来确定接下来应该向用户显示哪个问题。

我认为我的代码中存在某种无限循环，但我无法弄清楚它是什么。当我有一个sale_qualifier has_many answers关系时，这种方法很好，但是一旦我将关系更改为has_one关系，它就会崩溃。

我的代码：

 def show
  @sales_opportunity = SalesOpportunity.includes(:company, :user, :timeline_events, :sale_contacts, :swots, :sale_competitors).find(params[:id])
  @sale_qualifier = SaleQualifier.new(sales_opportunity_id: params[@sales_opportunity.id])
  @answer = @sale_qualifier.answers.build
  #if the question_id is blank it is the first question in the list
   if @sale_qualifier.question_id.blank?
    @question = Question.find_by_id(@sale_qualifier.next_question_id)
   else
    @question = Question.find_by_id(@sale_qualifier.question_id)
   end
end

这只是设置show动作，所以我可以显示添加答案的表单：

<div class="panel panel-default">
 <%= form_for(@sale_qualifier) do |f| %>
 <% if @sale_qualifier.errors.any? %>
  <div id="error_explanation">
   <h2><%= pluralize(@sale_qualifier.errors.count, "error") %> prohibited this answer from being saved:</h2>
   <ul>
   <% @sale_qualifier.errors.full_messages.each do |message| %>
     <li><%= message %></li>
   <% end %>
   </ul>
 </div>
<% end %>
<div class="panel-body">
 <div class="col-sm-6">
   <h2><%= @question.question_text %></h2>
 </div>
 <div class="col-sm-6">
   <div class="form-group">
    <%= f.hidden_field :sales_opportunity_id, :value => @sales_opportunity.id %>
    <%= f.hidden_field :question_id, :value => @question.id %>
  </div>
   <%= f.fields_for :answers do |answer| %>
    <%= answer.text_area :answer_text, :placeholder => "Enter your answer" %>
   <% end %>
  <div class="actions">
   <%= f.submit "Submit", class: "btn btn-large btn-success"%>
  </div>
  <% end %>
 </div>
</div>

提交后，由SaleQualifier创建方法处理：

  def create
  @sale_qualifier = SaleQualifier.new(sale_qualifier_params)

  respond_to do |format|
   if @sale_qualifier.save
    format.html { redirect_to @sale_qualifier, notice: 'Sale qualifier was successfully created.' }
    format.json { render :show, status: :created, location: @sale_qualifier }
  else
    format.html { render :new }
    format.json { render json: @sale_qualifier.errors, status: :unprocessable_entity }
  end
 end
end

但我认为错误发生在我已添加到Answer和SaleQualifier模型的方法中：

class Answer < ActiveRecord::Base
 validates :answer_text, presence: true
 belongs_to :sale_qualifier
 after_save :update_sale_qualifier

 def update_sale_qualifier
    sale_qualifier.update_next_question
    sale_qualifier.save
 end
end

class SaleQualifier < ActiveRecord::Base
 has_one :answer, :inverse_of => :sale_qualifier, dependent: :destroy
 accepts_nested_attributes_for :answer
 belongs_to :sales_opportunity
 validates :sales_opportunity_id, presence: true

def update_next_question
    #find the question that this SaleQualifier is associated with
    question = Question.find_by_id(self.question_id)
    #get its answer_type as this defines whether we need to look at the next_question_id_no or not
    ans_type = question.answer_type
    if ans_type == 'Text Field' || ans_type == 'Datetime' || ans_type == 'Integer' || ans_type == 'Boolean' && self.answer.answer_text == 'True'
        self.next_question_id = question.next_question_id_yes
        #if the answer_type is a boolean and the answer is no/false, then use the next_question_id_no to route the question
    elsif ans_type == 'Boolean' && self.answer.answer_text == 'False'
        self.next_question_id = question.next_question_id_no
    end
    #mark the question as answered, in case we need to iterate over the same quesiton in future
    self.has_answer = true
    #create a new SaleQualifier with the question set as the next question, unless it already exists and hasn't been answered yet or unless the next question id leads us to a result (i.e. no questions left in the tree)
    SaleQualifier.create(question_id: self.next_question_id, sales_opportunity_id: self.sales_opportunity_id) unless Question.exists?(:id => self.next_question_id) || SaleQualifier.find_by(question_id: self.next_question_id) && SaleQualifier.find_by(question_id: self.next_question_id).has_answer == false
 end
end

我收到以下错误：

Completed 500 Internal Server Error in 730ms

SystemStackError (stack level too deep): actionpack (4.1.1) lib/action_dispatch/middleware/reloader.rb:79

我假设这里有一个命名空间错误，因为我可能会使用“＆＃34; answer＆＃34;我的模型字段名称太多了。有人能帮我找到吗？

修改

错误正在循环执行以下一组SQL操作：

  SQL (0.6ms)  UPDATE "answers" SET "answer_text" = $1, "created_at" = $2, "id" = $3, "sale_qualifier_id" = $4, "updated_at" = $5 WHERE "answers"."id" = 6  [["answer_text", "Because they're Grrrreat!"], ["created_at", "2016-01-13 09:19:46.172878"], ["id", 6], ["sale_qualifier_id", 8], ["updated_at", "2016-01-13 09:19:46.172878"]]
 Question Load (0.5ms)  SELECT  "questions".* FROM "questions"  WHERE "questions"."id" = 1 LIMIT 1
 Question Exists (0.5ms)  SELECT  1 AS one FROM "questions"  WHERE "questions"."id" = 2 LIMIT 1
 CACHE (0.0ms)  SELECT  "questions".* FROM "questions"  WHERE "questions"."id" = 1 LIMIT 1
 SQL (0.4ms)  UPDATE "sale_qualifiers" SET "created_at" = $1, "has_answer" = $2, "id" = $3, "next_question_id" = $4, "question_id" = $5, "sales_opportunity_id" = $6, "updated_at" = $7 WHERE "sale_qualifiers"."id" = 8  [["created_at", "2016-01-13 09:19:46.164754"], ["has_answer", "t"], ["id", 8], ["next_question_id", 2], ["question_id", 1], ["sales_opportunity_id", 77], ["updated_at", "2016-01-13 09:19:46.164754"]]
 SQL (0.3ms)  UPDATE "answers" SET "answer_text" = $1, "created_at" = $2, "id" = $3, "sale_qualifier_id" = $4, "updated_at" = $5 WHERE "answers"."id" = 6  [["answer_text", "Because they're Grrrreat!"], ["created_at", "2016-01-13 09:19:46.172878"], ["id", 6], ["sale_qualifier_id", 8], ["updated_at", "2016-01-13 09:19:46.172878"]]
 Question Load (0.6ms)  SELECT  "questions".* FROM "questions"  WHERE "questions"."id" = 1 LIMIT 1
 Question Exists (0.4ms)  SELECT  1 AS one FROM "questions"  WHERE "questions"."id" = 2 LIMIT 1
 (0.4ms)  ROLLBACK

SystemStackError（堆栈级别太深）：在我的创建控制器

0 个答案: