Add questions with mutiple answers to polls public interface

The `reload` method added to max_votes validation is needed because the
author gets here with some changes because of the around_action
`switch_locale`, which adds some changes to the current user record and
therefore, the lock method raises an exception when trying to lock it
requiring us to save or discard those record changes.

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

@@ -15,7 +15,8 @@
                       remote: true,
                       title: t("poll_questions.show.vote_answer", answer: question_answer.title),
                       class: "button secondary hollow",
-                      "aria-pressed": false do %>
+                      "aria-pressed": false,
+                      disabled: disable_answer?(question_answer) do %>
           <%= question_answer.title %>
         <% end %>
       <% end %>

app/components/polls/questions/answers_component.rb

@@ -18,6 +18,10 @@ class Polls::Questions::AnswersComponent < ApplicationComponent
     user_answers.find_by(answer: question_answer.title)
   end
 
+  def disable_answer?(question_answer)
+    question.multiple? && user_answers.count == question.max_votes
+  end
+
   private
 
     def user_answers

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

@@ -3,6 +3,12 @@
     <%= question.title %>
   </h3>
 
+  <% if question.votation_type.present? %>
+    <strong>
+      <%= t("poll_questions.description.#{question.vote_type}", maximum: question.max_votes) %>
+    </strong>
+  <% end %>
+
   <div id="<%= dom_id(question) %>_answers" class="padding">
     <%= render Polls::Questions::AnswersComponent.new(question) %>
   </div>

app/controllers/polls/questions_controller.rb

@@ -5,9 +5,7 @@ class Polls::QuestionsController < ApplicationController
   has_orders %w[most_voted newest oldest], only: :show
 
   def answer
-    answer = @question.answers.find_or_initialize_by(author: current_user)
+    answer = @question.find_or_initialize_user_answer(current_user, params[:answer])
-
-    answer.answer = params[:answer]
     answer.save_and_record_voter_participation
 
     respond_to do |format|
@@ -15,7 +13,7 @@ class Polls::QuestionsController < ApplicationController
         redirect_to request.referer
       end
       format.js do
-        render :answer
+        render :answers
       end
     end
   end

app/models/concerns/questionable.rb

@@ -10,4 +10,21 @@ module Questionable
   def unique?
     votation_type.nil? || votation_type.unique?
   end
+
+  def find_or_initialize_user_answer(user, title)
+    answer = answers.find_or_initialize_by(find_by_attributes(user, title))
+    answer.answer = title
+    answer
+  end
+
+  private
+
+    def find_by_attributes(user, title)
+      case vote_type
+      when "unique", nil
+        { author: user }
+      when "multiple"
+        { author: user, answer: title }
+      end
+    end
 end

app/models/poll/answer.rb

@@ -38,6 +38,7 @@ class Poll::Answer < ApplicationRecord
     def max_votes
       return if !question || question&.unique? || persisted?
 
+      author.reload
       author.lock!
 
       if question.answers.by_author(author).count >= question.max_votes

config/locales/en/general.yml

@@ -636,6 +636,9 @@ en:
     show:
       vote_answer: "Vote %{answer}"
       voted: "You have voted %{answer}"
+    description:
+      unique: "You can select a maximum of 1 answer."
+      multiple: "You can select a maximum of %{maximum} answers."
   proposal_notifications:
     new:
       title: "Send notification"

config/locales/es/general.yml

@@ -636,6 +636,9 @@ es:
     show:
       vote_answer: "Votar %{answer}"
       voted: "Has votado %{answer}"
+    description:
+      unique: "Puedes seleccionar un máximo de 1 respuesta."
+      multiple: "Puedes seleccionar un máximo de %{maximum} respuestas."
   proposal_notifications:
     new:
       title: "Enviar notificación"

spec/components/polls/questions/answers_component_spec.rb

@@ -33,6 +33,20 @@ describe Polls::Questions::AnswersComponent do
     expect(page).to have_css "button[aria-pressed='true']", text: "Yes"
   end
 
+  it "renders disabled buttons when max votes is reached" do
+    user = create(:user, :verified)
+    question = create(:poll_question_multiple, :abc, max_votes: 2, author: user)
+    create(:poll_answer, author: user, question: question, answer: "Answer A")
+    create(:poll_answer, author: user, question: question, answer: "Answer C")
+    sign_in(user)
+
+    render_inline Polls::Questions::AnswersComponent.new(question)
+
+    expect(page).to have_button "You have voted Answer A"
+    expect(page).to have_button "Vote Answer B", disabled: true
+    expect(page).to have_button "You have voted Answer C"
+  end
+
   it "when user is not signed in, renders answers links pointing to user sign in path" do
     render_inline Polls::Questions::AnswersComponent.new(question)
 

spec/system/polls/votation_types_spec.rb

@@ -0,0 +1,69 @@
+require "rails_helper"
+
+describe "Poll Votation Type" do
+  let(:author) { create(:user, :level_two) }
+
+  before do
+    login_as(author)
+  end
+
+  scenario "Unique answer" do
+    question = create(:poll_question_unique, :yes_no)
+
+    visit poll_path(question.poll)
+
+    expect(page).to have_content "You can select a maximum of 1 answer."
+    expect(page).to have_content(question.title)
+    expect(page).to have_button("Vote Yes")
+    expect(page).to have_button("Vote No")
+
+    within "#poll_question_#{question.id}_answers" do
+      click_button "Yes"
+
+      expect(page).to have_button("You have voted Yes")
+      expect(page).to have_button("Vote No")
+
+      click_button "No"
+
+      expect(page).to have_button("Vote Yes")
+      expect(page).to have_button("You have voted No")
+    end
+  end
+
+  scenario "Multiple answers" do
+    question = create(:poll_question_multiple, :abc, max_votes: 2)
+    visit poll_path(question.poll)
+
+    expect(page).to have_content "You can select a maximum of 2 answers."
+    expect(page).to have_content(question.title)
+    expect(page).to have_button("Vote Answer A")
+    expect(page).to have_button("Vote Answer B")
+    expect(page).to have_button("Vote Answer C")
+
+    within "#poll_question_#{question.id}_answers" do
+      click_button "Vote Answer A"
+
+      expect(page).to have_button("You have voted Answer A")
+
+      click_button "Vote Answer C"
+
+      expect(page).to have_button("You have voted Answer C")
+      expect(page).to have_button("Vote Answer B", disabled: true)
+
+      click_button "You have voted Answer A"
+
+      expect(page).to have_button("Vote Answer A")
+      expect(page).to have_button("Vote Answer B")
+
+      click_button "You have voted Answer C"
+
+      expect(page).to have_button("Vote Answer C")
+
+      click_button "Vote Answer B"
+
+      expect(page).to have_button("You have voted Answer B")
+      expect(page).to have_button("Vote Answer A")
+      expect(page).to have_button("Vote Answer C")
+    end
+  end
+end