How to save nested form data in Rails? - ruby-on-rails

Question

I have this data inside my foods and drinks table:
Foods table
ID | Name
------------
1 | Rojak
2 | Lemang
Drinks table
ID | Name
------------
1 | Barli
2 | Sirap
My model relationship is:
class Survey < ActiveRecord::Base
has_many :questions
accepts_nested_attributes_for :questions, allow_destroy: true
end
class Question < ActiveRecord::Base
belongs_to :survey
has_many :answers
accepts_nested_attributes_for :answers, allow_destroy: true
end
class Answer < ActiveRecord::Base
belongs_to :question
has_many :foods
has_many :drinks
accepts_nested_attributes_for :foods, :drinks
end
class Food < ActiveRecord::Base
belongs_to :answer
end
class Drink < ActiveRecord::Base
belongs_to :answer
end
And this is my _form.html.erb file inside app/views/surveys:
<%= form_for #survey do |f| %>
<% if #survey.errors.any? %>
<div class="error_messages">
<h2><%= pluralize(#survey.errors.count, "error") %> prohibited this survey from being saved:</h2>
<ul>
<% #survey.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<br>
<%= f.fields_for :questions do |f| %>
<fieldset>
<%= f.label :content, "Question" %><br />
<%= f.text_area :content %><br />
<% Food.all.each do |fd| %>
<fieldset>
<%= f.fields_for :answers do |f| %>
<%= f.text_field :name, :value => fd.name %>
<%= f.number_field :quantity %>
<% end %> <br>
</fieldset>
<% end %>
</fieldset>
<br>
<% end %>
<br>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
What I'm trying to do is:
List all foods name and drinks name inside foods and drinks fieldset
Give each of the foods and drinks a quantity (this quantity column is inside answers table)
Save and update it
But I got no luck. When I'm try to load the edit view (the form), I managed to list all of the foods name. But, I've no idea how to list all of the drinks name in its own fieldset.
I try to make it like this but it didn't work:
<% if :content == "Foods" %>
<%= #loads foods %>
<% else %>
<%= #loads drinks %>
<% end %>
And, when I try to save the foods/drinks name and its quantity, it didn't work too.
Demo:
How to fix this problem?
Note:
This is update method inside surveys_controller:
def update
if #survey.update(survey_params)
redirect_to #survey, notice: "Successfully updated survey."
else
render :edit
end
end
...
def survey_params
params.require(:survey).permit(:name, questions_attributes: [:id, :_destroy, :content, answers_attributes: [:id, :_destroy, :content, :quantity]])
end
Update:
This is my show.html.erb
<h1><%= #survey.name %></h1>
<ul class="questions">
<% #survey.questions.each do |question| %>
<li>
<%= question.content %>
<ol class="answers">
<% question.answers.each do |answer| %>
<li><%= answer.content %> (<%= answer.quantity %>)</li>
<% end %>
</ol>
</li> <br>
<% end %>
</ul>
<%= link_to 'Edit', edit_survey_path(#survey) %> |
<%= link_to 'Back to Surveys', surveys_path %>

Answer 1

You might be seeing an issue with variable scope. Each time you create a nested form with f.fields_for you pass in the variable f, even though f is the variable used in the parent.
Try calling it something different with questions and answers, such as:
<%= f.fields_for :questions do |fq| %>
<fieldset>
<%= fq.label :content, "Question" %><br />
<%= fq.text_area :content %><br />
<% Food.all.each do |fd| %>
<fieldset>
<%= fq.fields_for :answers do |fa| %>
<%= fa.text_field :name, :value => fd.name %>
<%= fa.number_field :quantity %>
<% end %> <br>
</fieldset>
<% end %>
</fieldset>
<br>
<% end %>