Merge pull request #235 from coderdojo-japan/distinct-joins

Refactor dojo count

Author: yasulab

app/controllers/static_pages_controller.rb

@@ -20,8 +20,11 @@ def stats
     @range = 2012..2017
     @range.each do |year|
       @dojos[year] =
-        Dojo.where(created_at: Time.zone.local(2012).beginning_of_year..Time.zone.local(year)
-               .end_of_year).select{|d| d.dojo_event_services.any?}.count
+        Dojo
+          .distinct
+          .joins(:dojo_event_services)
+          .where(created_at: Time.zone.local(@range.first).beginning_of_year..Time.zone.local(year).end_of_year)
+          .count
       @events[year] =
         EventHistory.where(evented_at:
                      Time.zone.local(year).beginning_of_year..Time.zone.local(year).end_of_year).count