Allow to remove poll answers

app/components/polls/questions/answers_component.html.erb

@@ -2,15 +2,20 @@
   <% if can?(:answer, question) && !question.poll.voted_in_booth?(current_user) %>
     <% question_answers.each do |question_answer| %>
       <% if already_answered?(question_answer) %>
-        <span class="button answered"
-              title="<%= t("poll_questions.show.voted", answer: question_answer.title) %>">
+        <%= button_to question_answer_path(question, user_answer(question_answer)),
+                      method: :delete,
+                      remote: true,
+                      title: t("poll_questions.show.voted", answer: question_answer.title),
+                      class: "button answered",
+                      "aria-pressed": true do %>
           <%= question_answer.title %>
-        </span>
+        <% end %>
       <% else %>
         <%= button_to answer_question_path(question, answer: question_answer.title),
                       remote: true,
                       title: t("poll_questions.show.vote_answer", answer: question_answer.title),
-                      class: "button secondary hollow" do %>
+                      class: "button secondary hollow",
+                      "aria-pressed": false do %>
           <%= question_answer.title %>
         <% end %>
       <% end %>

app/components/polls/questions/answers_component.rb

@@ -7,13 +7,17 @@ class Polls::Questions::AnswersComponent < ApplicationComponent
   end
 
   def already_answered?(question_answer)
-    user_answers.find_by(answer: question_answer.title).present?
+    user_answer(question_answer).present?
   end
 
   def question_answers
     question.question_answers
   end
 
+  def user_answer(question_answer)
+    user_answers.find_by(answer: question_answer.title)
+  end
+
   private
 
     def user_answers

app/controllers/polls/answers_controller.rb

@@ -0,0 +1,19 @@
+class Polls::AnswersController < ApplicationController
+  load_and_authorize_resource :question, class: "::Poll::Question"
+  load_and_authorize_resource :answer, class: "::Poll::Answer",
+                                       through: :question,
+                                       through_association: :answers
+
+  def destroy
+    @answer.destroy!
+
+    respond_to do |format|
+      format.html do
+        redirect_to request.referer
+      end
+      format.js do
+        render "polls/questions/answers"
+      end
+    end
+  end
+end

app/models/abilities/common.rb

@@ -112,6 +112,9 @@ module Abilities
         can :answer, Poll::Question do |question|
           question.answerable_by?(user)
         end
+        can :destroy, Poll::Answer do |answer|
+          answer.author == user && answer.question.answerable_by?(user)
+        end
       end
 
       can [:create, :show], ProposalNotification, proposal: { author_id: user.id }

config/routes/poll.rb

@@ -6,6 +6,7 @@ resources :polls, only: [:show, :index] do
 
   resources :questions, controller: "polls/questions", shallow: true do
     post :answer, on: :member
+    resources :answers, controller: "polls/answers", only: :destroy, shallow: false
   end
 end
 

spec/components/polls/questions/answers_component_spec.rb

@@ -18,18 +18,19 @@ describe Polls::Questions::AnswersComponent do
 
     expect(page).to have_button "Yes"
     expect(page).to have_button "No"
+    expect(page).to have_css "button[aria-pressed='false']", count: 2
   end
 
-  it "renders a span instead of a button for existing user answers" do
+  it "renders button to destroy current user answers" do
     user = create(:user, :verified)
     create(:poll_answer, author: user, question: question, answer: "Yes")
     sign_in(user)
 
     render_inline Polls::Questions::AnswersComponent.new(question)
 
-    expect(page).to have_selector "span", text: "Yes"
-    expect(page).not_to have_button "Yes"
-    expect(page).to have_button "No"
+    expect(page).to have_button "You have voted Yes"
+    expect(page).to have_button "Vote No"
+    expect(page).to have_css "button[aria-pressed='true']", text: "Yes"
   end
 
   it "when user is not signed in, renders answers links pointing to user sign in path" do

spec/models/abilities/common_spec.rb

@@ -232,6 +232,18 @@ describe Abilities::Common do
       it { should_not be_able_to(:answer, expired_poll_question_from_all_geozones)  }
       it { should_not be_able_to(:answer, expired_poll_question_from_other_geozone) }
 
+      context "Poll::Answer" do
+        let(:own_answer) { create(:poll_answer, author: user) }
+        let(:other_user_answer) { create(:poll_answer) }
+        let(:expired_poll) { create(:poll, :expired) }
+        let(:question) { create(:poll_question, :yes_no, poll: expired_poll) }
+        let(:expired_poll_answer) { create(:poll_answer, author: user, question: question, answer: "Yes") }
+
+        it { should be_able_to(:destroy, own_answer) }
+        it { should_not be_able_to(:destroy, other_user_answer) }
+        it { should_not be_able_to(:destroy, expired_poll_answer) }
+      end
+
       context "without geozone" do
         before { user.geozone = nil }
 

spec/support/common_actions/polls.rb

@@ -5,8 +5,8 @@ module Polls
     within("#poll_question_#{question.id}_answers") do
       click_button answer
 
-      expect(page).to have_css("span.answered", text: answer)
-      expect(page).not_to have_button(answer)
+      expect(page).to have_button("You have voted #{answer}")
+      expect(page).not_to have_button("Vote #{answer}")
     end
   end
 

spec/system/polls/polls_spec.rb

@@ -246,10 +246,10 @@ describe "Polls" do
       visit poll_path(poll)
 
       within("#poll_question_#{question.id}_answers") do
-        click_button "Yes"
+        click_button "Vote Yes"
 
-        expect(page).not_to have_button "Yes"
-        expect(page).to have_button "No"
+        expect(page).to have_button "You have voted Yes"
+        expect(page).to have_button "Vote No"
       end
     end
 
@@ -266,13 +266,13 @@ describe "Polls" do
       within("#poll_question_#{question.id}_answers") do
         click_button "Yes"
 
-        expect(page).not_to have_button "Yes"
-        expect(page).to have_button "No"
+        expect(page).to have_button "You have voted Yes"
+        expect(page).to have_button "Vote No"
 
         click_button "No"
 
-        expect(page).not_to have_button "No"
-        expect(page).to have_button "Yes"
+        expect(page).to have_button "Vote Yes"
+        expect(page).to have_button "You have voted No"
       end
     end
 
@@ -309,7 +309,7 @@ describe "Polls" do
       within("#poll_question_#{question.id}_answers") do
         click_button "Yes"
 
-        expect(page).not_to have_button "Yes"
+        expect(page).to have_button "You have voted Yes"
         expect(page).to have_button "No"
       end
     end

spec/system/polls/voter_spec.rb

@@ -23,8 +23,10 @@ describe "Voter" do
       visit poll_path(poll)
 
       within("#poll_question_#{question.id}_answers") do
-        click_button answer_yes.title
-        expect(page).not_to have_button(answer_yes.title)
+        click_button "Vote Yes"
+
+        expect(page).to have_button("You have voted Yes")
+        expect(page).not_to have_button("Vote Yes")
       end
 
       expect(Poll::Voter.count).to eq(1)