ruby-on-rails - 如何以一种 rails 形式处理多个模型？

Question

我有以下型号

class Survey < ActiveRecord::Base
  has_many :survey_sections
  accepts_nested_attributes_for :survey_sections
end

class SurveySection < ActiveRecord::Base
  belongs_to :survey
  has_many :questions
  accepts_nested_attributes_for :questions
end

class Question < ActiveRecord::Base
  belongs_to :survey_section
  has_many :answers
  belongs_to :question_group
  accepts_nested_attributes_for :question_group
  accepts_nested_attributes_for :answers
end

class Answer < ActiveRecord::Base
  belongs_to :question
end

class QuestionGroup < ActiveRecord::Base
  has_many :questions
end

我的 Controller :

 def new
    @survey = Survey.new
    survey_section = @survey.survey_sections.build
    survey_section.questions.build
  end

 def create
    @survey = Survey.new(survey_params)
    if @survey.save
      redirect_to @survey, notice: 'Super'
    else
      render 'new'
    end
  end

 def survey_params
      params.require(:survey).permit(:title, :description, survey_sections_attributes:[:id, :title, questions_attributes:[:id, :text, answers_attributes:[:id, :text]]])
    end

如何在超过 3 个模型中保存数据？目前，我可以将调查表数据保存到调查、调查部分和问题模型中。但是我不知道我必须在 Controller 中做什么才能将数据保存到其他模型中。

Answer 1

如果您使用 fields_for，您可以根据需要处理任意数量的表单正确的 helper 。

我认为这就是您的不足之处(您的 Controller 似乎还不错)。

我也是wrote an answer about this有一段时间了。

#app/models/survey.rb
class Survey < ActiveRecord::Base
    has_many :sections
    accepts_nested_attributes_for :sections
end

#app/models/section.rb
class Section < ActiveRecord::Base
    belongs_to :survey
    has_many :questions
    accepts_nested_attributes_for :questions
end

#app/models/question.rb
class Question < ActiveRecord::Base
    belongs_to :section
    has_many :answers
end

尝试让您的模型名称尽可能简洁。

#app/controllers/surveys_controller.rb
class SurveysController < ApplicationController
   def new
      @survey = Survey.new
      @survey.sections.build.questions.build
   end

   def create
      @survey = Survey.new survey_params
      @survey.save
   end

   private 

   def survey_params
      params.require(:survey).permit(:title, sections_attributes: [:title, questions_attributes:[:title]])
   end
end

#app/views/surveys/new.html.erb
<%= form_for @survey do |f| %>
   <%= f.text_field :title %>
   <%= f.fields_for :sections do |section| %>
       <%= section.text_field :title %>
       <%= section.fields_for :questions do |question| %>
           <%= question.text_field :title %>
       <% end %>
   <% end %> 
   <%= f.submit %>
<% end %>