Controllers and models to see the polls stats. Routes related also added.

app/models/poll/stats.rb

@@ -0,0 +1,36 @@
+class Poll
+  class Stats
+
+    def initialize(poll)
+      @poll = poll
+    end
+
+    def generate
+      stats = %w[total_participants total_participants_web total_participants_booth]
+      stats.map { |stat_name| [stat_name.to_sym, send(stat_name)] }.to_h
+    end
+
+    private
+
+      def total_participants
+        stats_cache('total_participants') { voters.uniq.count }
+      end
+
+      def total_participants_web
+        stats_cache('total_participants_web') { voters.where(origin: 'web').count }
+      end
+
+      def total_participants_booth
+        stats_cache('total_participants_booth') { voters.where(origin: 'booth').count }
+      end
+
+      def voters
+        stats_cache('voters') { @poll.voters }
+      end
+
+      def stats_cache(key, &block)
+        Rails.cache.fetch("polls_stats/#{@poll.id}/#{key}/v7", &block)
+      end
+
+  end
+end