Question about rendering response to ajax request.

gistfile1.rb

# In this controller below, I removed the render :nothing & set up views/choices/update.js.erb
class ChoicesController < ApplicationController

  before_action :require_user

  def update
    respond_to do |format|
      format.js   {
        @choice = Choice.find(params[:id])
        choices = @choice.question.choices.where(student_id: current_user.id)
        choices.each do |choice|
          choice.update_column(:selected, false)
          choice.answer
        end
        @choice.update_column(:selected, true)
      }
    end
  end

end

# views/choices/update.js.erb....

$('#question_<%= @choice.question.id %>').html("<%= j render partial: 'assessments/answers_to_each_question', :locals => { question: @choice.question } %>");


# views/assessments/show.html.haml.....

  -i = 1
  -@assessment.questions.each do |question|
    %hr
    %h3=i.to_s + ". " + question.question_content
    %span{:id => "question_#{question.id}"}= render 'answers_to_each_question', :question => question
    -i = i + 1