如何在一个 rails 表单中处理多个模型？

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

我的控制器：

 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控制器中做什么才能将数据保存到其他模型中。

Answer 1

如果正确使用 fields_for 助手，您可以根据需要处理任意数量的表单。

我认为这就是您的不足之处（您的控制器似乎还不错）。

前段时间我也wrote an answer about this。

#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

尽量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 %>

Answer 2

您可以在此处使用相同类型的模型获得最佳解释

http://railscasts.com/episodes/196-nested-model-form-part-1

#app/models/survey.rb
class Survey < ActiveRecord::Base
    has_many :sections, :dependent => :destroy
    accepts_nested_attributes_for :sections, :allow_destroy => true
end

#app/models/section.rb
class Section < ActiveRecord::Base
    belongs_to :survey
    has_many :questions, :dependent => :destroy
    accepts_nested_attributes_for :questions, :allow_destroy => true
end

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

现在在控制器中

def new
  @survey = Survey.new
  section = @survey.sections.build
  section.questions.build 
  end
end

现在在观看中

<%= form_for @survey do |f| %>
  <%= f.error_messages %>
  <p>
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </p>
  <%= f.fields_for :sections do |builder| %>
     <%= builder.text_field :title %>
     <%= builder.fields_for :questions do |question| %>
        <%=  question.text_field :content%>
     <% end %>
  <% end %>
  <p><%= f.submit "Submit" %></p>
<% end %>

如何在一个 rails 表单中处理多个模型？

How to handle multiple models in one rails form?

ruby

ruby-on-rails

nested-forms