How to handle multiple models in one rails form? - ruby-on-rails

Question

I have the following models
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
My 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
How it is possible to save data in more then 3 models?
At the moment i can save from my survey form data into the survey, survey section and question model. But i don't know what i have to in the controller that i can save data into the other models.

Answer 1

You can handle as many forms as you need, if you use the fields_for helper properly.
This is where you're falling short I think (your controller seems okay).
I also wrote an answer about this some time back.
#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
Try and keep your model names as succinct as possible.
#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

You can get best explanation here with same type of model
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
now in controller
def new
#survey = Survey.new
section = #survey.sections.build
section.questions.build
end
end
Now in views
<%= 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 %>