Count total_votes by option_id instead of answer title

This makes Option#total_votes independent of translations
and resilient to title changes.

app/models/poll/question/option.rb

@@ -40,8 +40,7 @@ class Poll::Question::Option < ApplicationRecord
   end
 
   def total_votes
-    Poll::Answer.where(question_id: question, answer: title).count +
-      ::Poll::PartialResult.where(question: question).where(answer: title).sum(:amount)
+    answers.count + partial_results.sum(:amount)
   end
 
   def total_votes_percentage

spec/models/poll/question/option_spec.rb

@@ -60,4 +60,83 @@ describe Poll::Question::Option do
       expect(option.with_read_more?).to be_truthy
     end
   end
+
+  describe "#total_votes" do
+    let!(:question) { create(:poll_question) }
+
+    context "with translated options" do
+      let(:option_yes) { create(:poll_question_option, question: question, title_en: "Yes", title_es: "Sí") }
+
+      it "group votes from different locales for the same option" do
+        create(:poll_answer, question: question, option: option_yes, answer: "Sí")
+        create(:poll_answer, question: question, option: option_yes, answer: "Yes")
+
+        expect(option_yes.total_votes).to eq 2
+      end
+    end
+
+    context "with options whose titles collide across locales" do
+      let!(:option_a) do
+        create(:poll_question_option, question: question, title_en: "Lead", title_es: "Plomo")
+      end
+      let!(:option_b) do
+        create(:poll_question_option, question: question, title_en: "Plomo", title_es: "Lead")
+      end
+
+      it "keeps votes isolated to the correct option" do
+        create(:poll_answer, question: question, option: option_a, answer: "Plomo")
+        create(:poll_answer, question: question, option: option_a, answer: "Lead")
+
+        expect(option_b.total_votes).to eq 0
+      end
+    end
+
+    context "with partial results" do
+      it "sums amounts by option_id" do
+        option = create(:poll_question_option, question: question, title_en: "Yes", title_es: "Sí")
+        booth_assignment = create(:poll_booth_assignment, poll: question.poll)
+
+        create(:poll_partial_result,
+               booth_assignment: booth_assignment,
+               question: question,
+               option: option,
+               answer: "Yes",
+               amount: 2)
+
+        create(:poll_partial_result,
+               booth_assignment: create(:poll_booth_assignment, poll: question.poll),
+               question: question,
+               option: option,
+               answer: "Sí",
+               amount: 3)
+
+        expect(option.total_votes).to eq 5
+      end
+    end
+
+    context "with both answers and partial results" do
+      it "sums poll answers and partial results amounts" do
+        option = create(:poll_question_option, question: question, title_en: "Yes", title_es: "Sí")
+
+        create(:poll_answer, question: question, option: option, answer: "Yes")
+        create(:poll_answer, question: question, option: option, answer: "Sí")
+
+        create(:poll_partial_result,
+               booth_assignment: create(:poll_booth_assignment, poll: question.poll),
+               question: question,
+               option: option,
+               answer: "Yes",
+               amount: 2)
+
+        create(:poll_partial_result,
+               booth_assignment: create(:poll_booth_assignment, poll: question.poll),
+               question: question,
+               option: option,
+               answer: "Sí",
+               amount: 3)
+
+        expect(option.total_votes).to eq 7
+      end
+    end
+  end
 end

spec/models/poll/question_spec.rb

@@ -46,4 +46,44 @@ RSpec.describe Poll::Question do
       end
     end
   end
+
+  describe "#options_total_votes" do
+    let!(:question) { create(:poll_question) }
+    let!(:option_yes) { create(:poll_question_option, question: question, title_en: "Yes", title_es: "Sí") }
+    let!(:option_no) { create(:poll_question_option, question: question, title_en: "No", title_es: "No") }
+
+    before do
+      create(:poll_answer, question: question, option: option_yes, answer: "Sí")
+      create(:poll_answer, question: question, option: option_yes, answer: "Yes")
+      create(:poll_answer, question: question, option: option_no, answer: "No")
+    end
+
+    it "includes answers in every language" do
+      expect(question.options_total_votes).to eq 3
+    end
+
+    it "includes partial results counted by option_id" do
+      booth_assignment = create(:poll_booth_assignment, poll: question.poll)
+      create(:poll_partial_result,
+             booth_assignment: booth_assignment,
+             question: question,
+             option: option_yes,
+             amount: 4)
+
+      expect(question.options_total_votes).to eq 7
+    end
+
+    it "does not include votes from other questions even with same answer text" do
+      other_question = create(:poll_question, poll: question.poll)
+      other_option_yes = create(:poll_question_option,
+                                question: other_question,
+                                title_en: "Yes",
+                                title_es: "Sí")
+
+      create(:poll_partial_result, question: other_question, option: other_option_yes, amount: 4)
+      create(:poll_answer, question: other_question, option: other_option_yes, answer: "Yes")
+
+      expect(question.options_total_votes).to eq 3
+    end
+  end
 end