Nested Form (Railscast #196) - ruby-on-rails

Question

I understand some railscasts may be old, but revised shouldn't be. I am trying really hard to overcome nested form, but most answer i get is use a plugin. So i try to make the railcasts from scratch but an exception occurs. I am wondering what would be the Railcasts 196 Updated Version has today with proper code.
Here my code, maybe its a silly mistake from me.
Survey Model
class Survey < ActiveRecord::Base
has_many :questions, :dependent => :destroy
accepts_nested_attributes_for :questions , :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
attr_accessible :name, :questions_attributes
end
Question Model
class Question < ActiveRecord::Base
belongs_to :survey
attr_accessible :content, :question_id
accepts_nested_attributes_for :answers , :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
attr_accessible :name, :answers_attributes
end
Answer Model
class Answer < ActiveRecord::Base
belongs_to :questions
attr_accessible :content, :question_id
end
Survey Show Form
<p id="notice"><%= notice %></p>
<div>Name:</div>
<div><%=#survey.name%></div>
<% for question in #survey.questions %>
<div><%=h question.content%></div>
<% end %>
<%= link_to 'Edit', edit_survey_path(#survey) %> |
<%= link_to 'Back', surveys_path %>
Form.html.erb
<%= form_for(#survey) do |f| %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<%= f.fields_for :questions do |bf|%>
<% render 'question_fields, :f => bf %>
<% end %>
***<div class="actions">***
<%= f.submit %>
</div>
<% end %>
question_field Form
<%= f.label :content, "Question" %><br />
<%= f.text_area :content, :rows=> 3 %><br />
<%= f.check_box :_destroy %>
<%= f.label :_destroy, "Remove Question"%><br />
<%= f.fields_for :answer do |form| %>
<%= render 'answer_fields', :f => form %>
<% end %>
answer_field Form
<%= f.label :content, "Answer" %>
<%= f.text_field :content %>
<%= f.check_box :_destroy %>
<%= f.label :_destroy, "Remove" %>
Survey Controller
class SurveysController < ApplicationController
# GET /surveys
# GET /surveys.json
def index
#surveys = Survey.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: #surveys }
end
end
# GET /surveys/1
# GET /surveys/1.json
def show
#survey = Survey.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #survey }
end
end
# GET /surveys/new
# GET /surveys/new.json
def new
#survey = Survey.new
3.times {#survey.questions.build }
respond_to do |format|
format.html # new.html.erb
format.json { render json: #survey }
end
end
# GET /surveys/1/edit
def edit
#survey = Survey.find(params[:id])
end
# POST /surveys
# POST /surveys.json
def create
#survey = Survey.new(params[:survey])
respond_to do |format|
if #survey.save
format.html { redirect_to #survey, notice: 'Survey was successfully created.' }
format.json { render json: #survey, status: :created, location: #survey }
else
format.html { render action: "new" }
format.json { render json: #survey.errors, status: :unprocessable_entity }
end
end
end
# PUT /surveys/1
# PUT /surveys/1.json
def update
#survey = Survey.find(params[:id])
respond_to do |format|
if #survey.update_attributes(params[:survey])
format.html { redirect_to #survey, notice: 'Survey was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: #survey.errors, status: :unprocessable_entity }
end
end
end
# DELETE /surveys/1
# DELETE /surveys/1.json
def destroy
#survey = Survey.find(params[:id])
#survey.destroy
respond_to do |format|
format.html { redirect_to surveys_url }
format.json { head :no_content }
end
end
end
Here my error when creating a new survey
Not sure what else could be wrong
ArgumentError in SurveysController#create
No association found for name `answers'. Has it been defined yet?
Here the new error
SyntaxError in Surveys#new
Showing /home/jean/rail/surveysays/app/views/surveys/_form.html.erb where line #22 raised:
/home/jean/rail/surveysays/app/views/surveys/_form.html.erb:22: syntax error, unexpected keyword_class, expecting keyword_do or '{' or '('
#output_buffer.safe_concat(' <div class="actions">
^
/home/jean/rail/surveysays/app/views/surveys/_form.html.erb:24: unterminated regexp meets end of file
/home/jean/rail/surveysays/app/views/surveys/_form.html.erb:24: syntax error, unexpected $end, expecting keyword_end

Answer 1

Add has_many :answers to the Question model and change the Answer model to belongs_to :question.