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

i have data inside foods , 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 _form.html.erb file inside app/views/surveys:

<%= form_for @survey |f| %>   <% if @survey.errors.any? %>     <div class="error_messages">       <h2><%= pluralize(@survey.errors.count, "error") %> prohibited survey being saved:</h2>       <ul>       <% @survey.errors.full_messages.each |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 |f| %>     <fieldset>     <%= f.label :content, "question" %><br />     <%= f.text_area :content %><br />      <% food.all.each |fd| %>     <fieldset>       <%= f.fields_for :answers |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 is:

1. list foods name , drinks name inside foods , drinks fieldset
2. give each of foods , drinks quantity (this quantity column inside answers table)
3. save , update it

but got no luck. when i'm try load edit view (the form), managed list of foods name. but, i've no idea how list of drinks name in own fieldset.

i try make didn't work:

<% if :content == "foods" %>   <%= #loads foods %> <% else %>   <%= #loads drinks %> <% end %> 

and, when try save foods/drinks name , quantity, didn't work too.

demo:

how fix problem?

note:

this 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 show.html.erb

<h1><%= @survey.name %></h1>  <ul class="questions"> <% @survey.questions.each |question| %>   <li>     <%= question.content %>     <ol class="answers">       <% question.answers.each |answer| %>         <li><%= answer.content %> (<%= answer.quantity %>)</li>       <% end %>     </ol>   </li> <br> <% end %> </ul>  <%= link_to 'edit', edit_survey_path(@survey) %> | <%= link_to 'back surveys', surveys_path %> 

you might seeing issue variable scope. each time create nested form f.fields_for pass in variable f, though f variable used in parent.

try calling different questions , answers, such as:

<%= f.fields_for :questions |fq| %>   <fieldset>     <%= fq.label :content, "question" %><br />     <%= fq.text_area :content %><br />      <% food.all.each |fd| %>     <fieldset>       <%= fq.fields_for :answers |fa| %>       <%= fa.text_field :name, :value => fd.name %>       <%= fa.number_field :quantity %>     <% end %> <br>   </fieldset>   <% end %>  </fieldset> <br> <% end %>