Building survey from railscast in rails 5 - ruby-on-rails

Question

I have been following both the old and revised railscasts & this for something that i have to make along the same lines
I followed it upto some point but neither are the questions being displayed on the form nor are the answers getting added . Following is my model code
answers.rb
class Answer < ActiveRecord::Base
attr_accessor :content, :question_id
belongs_to :question
end
surveys.rb
class Survey < ApplicationRecord
attr_accessor :name, :questions_attributes
has_many :questions
accepts_nested_attributes_for :questions, allow_destroy: true
end
questions.rb
class Question < ApplicationRecord
attr_accessor :content, :survey_id, :answers_attributes
belongs_to :survey
has_many :answers
accepts_nested_attributes_for :answers, allow_destroy: true
end
Surveys Controller
class SurveysController < ApplicationController
before_action :set_survey, only: [:show, :edit, :update, :destroy]
# GET /surveys
# GET /surveys.json
def index
#surveys = Survey.all
end
# GET /surveys/1
# GET /surveys/1.json
def show
end
# GET /surveys/new
def new
#survey = Survey.new
3.times do
question = #survey.questions.build
4.times { question.answers.build }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_survey
#survey = Survey.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def survey_params
params.require(:survey).permit(:name, :question_id)
end
end
Views
_form.html.erb
<%= f.fields_for :questions do |builder| %>
<%= render 'question_fields', f: builder %>
<% end %>
<%= link_to_add_fields "Add Question", f, :questions %>
_question_fields.html.erb
<fieldset>
<%= f.label :content, "Question" %><br />
<%= f.text_area :content %><br />
<%= f.check_box :_destroy %>
<%= f.label :_destroy, "Remove Question" %>
<%= f.fields_for :answers do |builder| %>
<%= render 'answer_fields', f: builder %>
<% end %>
<%= link_to_add_fields "Add Answer", f, :answers %>
</fieldset>
_answers_fields.html.erb
<p>
<%= f.label :content, "Answer" %>
<%= f.text_field :content %>
<%= f.check_box :_destroy %>
<%= f.label :_destroy, "Remove" %>
</p>
show.html.erb
<p id="notice"><%= notice %></p>
<p>
<strong>Name:</strong>
<%= #survey.name %>
</p>
<ol>
<% for question in #survey.questions %>
<li><%= h question.content %></li>
<% end %>
</ol>
<p>
<%= link_to "Edit", edit_survey_path(#survey) %> |
<%= link_to "Destroy", #survey, :confirm => 'Are you sure?', :method => :delete %> |
<%= link_to "View All", surveys_path %>
</p>
Migrations
class CreateSurveys < ActiveRecord::Migration[5.0]
def change
create_table :surveys do |t|
t.string :name
t.timestamps
end
end
end
class CreateQuestions < ActiveRecord::Migration[5.0]
def change
create_table :questions do |t|
t.string :survey_id
t.string :integer
t.text :content
t.timestamps
end
end
end
Is there anything else i am missing out that needs to be done in rails 5 , i have been hours at this and it still confuses me why does it show me this error - Table 'app.answers' doesn't exist when i am calling answers from nested form . Any help in this regard would be very much appreciated .

Answer 1

The main issue here is it looks like you forgot an 'answer' migration to create the tables, create that and run it and should fix things up.
Additionally, those attr_accessor calls are going to be messing things up. They were required in older versions of Rails, but aren't anymore and now just serve throw things off. Example
With attr_accessor code
post = Post.new(title: "Something")
#=> #<Post id: nil, title: nil, created_at: nil, updated_at: nil>
post.title = "Something"
#=> "Something"
puts post
#=> #<Post id: nil, title: nil, created_at: nil, updated_at: nil>
Without
post = Post.new(title: "Something")
#=> #<Post id: nil, title: "Something", created_at: nil, updated_at: nil>
post.title = "Something Else"
#=> "Something Else"
puts post
#=> #<Post id: nil, title: "Something Else", created_at: nil, updated_at: nil>
As you can see, the first block, where my Post model had the attr_accessor for the title attribute, nothing was working as expected; I couldn't update the title. Once I removed it, things started to work as they should.
Based on the chat discussion, your _form.html.erb is missing form_for tag, and should looks something like
<%= form_for #survey do |f| %>
<%= f.label :name %><br />
<%= f.text_field :name %>
<!-- your current code here -->
<% end %>
you've got _answers_field.html.erb and in _question_fields.html.erb are calling
<%= render 'answer_fields', f: builder %>
Notice, the plural/singular mismatch.
and lastly, in your controller, you aren't permitting the nested attribute params which should end up looking like (unless I'm mistaken)
def survey_params
params.require(:survey).permit(:name, :question_attributes: [:id, :content, :_destroy, answer_attributes: [:id, :content, :_destroy])
end
Last couple of issues from chat were that the associations needed inverse_of because belongs_to is required by default in rails 5. And the last minor thing is that Answer is currently inheriting ActiveRecord::Base and the other models ApplicationRecord