Move question most voted answer from boolean to a enumerable max by total_votes

app/controllers/polls/questions_controller.rb

@@ -13,9 +13,6 @@ class Polls::QuestionsController < ApplicationController
     answer.touch if answer.persisted?
     answer.save!
     answer.record_voter_participation(token)
-    @question.question_answers.where(question_id: @question).each do |question_answer|
-      question_answer.set_most_voted
-    end
 
     @answers_by_question_id = { @question.id => params[:answer] }
   end

app/models/poll/question.rb

@@ -62,4 +62,7 @@ class Poll::Question < ApplicationRecord
     question_answers.inject(0) { |total, question_answer| total + question_answer.total_votes }
   end
 
+  def most_voted_answer_id
+    question_answers.max_by { |answer| answer.total_votes }.id
+  end
 end

app/models/poll/question/answer.rb

@@ -36,19 +36,7 @@ class Poll::Question::Answer < ApplicationRecord
       ::Poll::PartialResult.where(question: question).where(answer: title).sum(:amount)
   end
 
-  def most_voted?
-    most_voted
-  end
-
   def total_votes_percentage
     question.answers_total_votes.zero? ? 0 : (total_votes * 100.0) / question.answers_total_votes
   end
-
-  def set_most_voted
-    answers = question.question_answers
-                      .map { |a| Poll::Answer.where(question_id: a.question, answer: a.title).count }
-    is_most_voted = answers.none?{ |a| a > total_votes }
-
-    update(most_voted: is_most_voted)
-  end
 end

app/views/polls/results.html.erb

@@ -17,13 +17,14 @@
 
     <div class="small-12 medium-9 column" data-equalizer-watch>
       <%- @poll.questions.each do |question| %>
+        <% most_voted_answer_id = question.most_voted_answer_id %>
         <h3 id="<%= question.title.parameterize %>"><%= question.title %></h3>
         <table id="question_<%= question.id %>_results_table">
           <thead>
             <tr>
               <%- question.question_answers.each do |answer| %>
-                <th scope="col" <%= answer.most_voted? ? "class=win" : "" %>>
+                <th scope="col" <%= answer.id == most_voted_answer_id ? "class=win" : "" %>>
-                  <% if answer.most_voted %>
+                  <% if answer.id == most_voted_answer_id %>
                     <span class="show-for-sr"><%= t("polls.show.results.most_voted_answer") %></span>
                   <% end %>
                   <%= answer.title %>
@@ -34,7 +35,7 @@
           <tbody>
             <tr>
               <%- question.question_answers.each do |answer| %>
-                <td id="answer_<%= answer.id %>_result" <%= answer.most_voted? ? "class=win" : "" %>>
+                <td id="answer_<%= answer.id %>_result" <%= answer.id == most_voted_answer_id ? "class=win" : "" %>>
                   <%= answer.total_votes %>
                   (<%= answer.total_votes_percentage.round(2) %>%)
                 </td>