allows users to change their vote without refreshing the page

app/models/poll/answer.rb

@@ -14,6 +14,6 @@ class Poll::Answer < ActiveRecord::Base
   scope :by_question, ->(question_id) { where(question_id: question_id) }
 
   def record_voter_participation
-    Poll::Voter.create!(user: author, poll: poll)
+    Poll::Voter.find_or_create_by!(user: author, poll: poll)
   end
 end

spec/features/polls/polls_spec.rb

@@ -184,6 +184,7 @@ feature 'Polls' do
       poll.geozones << geozone
       create(:poll_question, poll: poll, valid_answers: 'Han Solo, Chewbacca')
       user = create(:user, :level_two, geozone: geozone)
+
       login_as user
       visit poll_path(poll)
 
@@ -193,5 +194,25 @@ feature 'Polls' do
       expect(page).to have_link('Chewbacca')
     end
 
+    scenario 'Level 2 users changing answer', :js do
+      poll.update(geozone_restricted: true)
+      poll.geozones << geozone
+      create(:poll_question, poll: poll, valid_answers: 'Han Solo, Chewbacca')
+      user = create(:user, :level_two, geozone: geozone)
+
+      login_as user
+      visit poll_path(poll)
+
+      click_link 'Han Solo'
+
+      expect(page).to_not have_link('Han Solo')
+      expect(page).to have_link('Chewbacca')
+
+      click_link 'Chewbacca'
+
+      expect(page).to_not have_link('Chewbacca')
+      expect(page).to have_link('Han Solo')
+    end
+
   end
 end

spec/models/poll/answer_spec.rb

@@ -14,17 +14,38 @@ describe Poll::Answer do
   end
 
   describe "#record_voter_participation" do
+
+    let(:author) { create(:user, :level_two) }
+    let(:poll) { create(:poll) }
+    let(:question) { create(:poll_question, poll: poll, valid_answers: "Yes, No") }
+
     it "creates a poll_voter with user and poll data" do
-      answer = create(:poll_answer)
+      answer = create(:poll_answer, question: question, author: author, answer: "Yes")
       expect(answer.poll.voters).to be_blank
 
       answer.record_voter_participation
-      expect(answer.poll.reload.voters.size).to eq(1)
-      voter = answer.poll.voters.first
+      expect(poll.reload.voters.size).to eq(1)
+      voter = poll.voters.first
 
       expect(voter.document_number).to eq(answer.author.document_number)
       expect(voter.poll_id).to eq(answer.poll.id)
     end
+
+    it "updates a poll_voter with user and poll data" do
+      answer = create(:poll_answer, question: question, author: author, answer: "Yes")
+      answer.record_voter_participation
+
+      expect(poll.reload.voters.size).to eq(1)
+
+      answer = create(:poll_answer, question: question, author: author, answer: "No")
+      answer.record_voter_participation
+
+      expect(poll.reload.voters.size).to eq(1)
+
+      voter = poll.voters.first
+      expect(voter.document_number).to eq(answer.author.document_number)
+      expect(voter.poll_id).to eq(answer.poll.id)
+    end
   end
 
 end