Rails 4 nested attributes and has_many :through associaton in a form

_form.erb.html

<p>
    <%= f.label :name %><br/>
    <%= f.text_field :name %>
    <div class="field">
    <%= f.fields_for :questionnaire_surveys do |ff| %>
       <%= ff.fields_for :survey do |builder| %>
         <% @surveys.each do |survey| %> 
         <%= builder.check_box :id, {}, survey.id %>
         <%= builder.label survey.name %>
         <% end %>
       <% end %>   
     <% end %>
    
   </div>
  </p>


---阿芝解答-----

 <div class="field">
         <% @surveys.each do |survey| %> 
            <%= check_box_tag "questionnaire[questionnaire_surveys_attributes][][survey_id]", survey.id %>
            <%= label_tag survey.name %>
         <% end %>
</div>

Questionnaire.rb

class Questionnaire < ActiveRecord::Base
  
  has_many :questionnaire_surveys
  has_many :surveys, through: :questionnaire_surveys

  accepts_nested_attributes_for :questionnaire_surveys
end

questionnaires_controller.rb

def questionnaire_params
    params.require(:questionnaire).permit(questionnaire_surveys_attributes: [survey_attributes:[]])
end

---阿芝解答-----
params.require(:questionnaire).permit(:name, questionnaire_surveys_attributes: [:survey_id])

QuestionnaireSurvey.rb

class QuestionnaireSurvey < ActiveRecord::Base
    belongs_to :questionnaire
    belongs_to :survey


    accepts_nested_attributes_for :survey

end

Survey.rb

Class Survey
    has_many :questionnaire_surveys
    has_many :questionnaires, through: :questionnaire_surveys
end