Roughly render year-by-year stats table

Author: yasulab

app/controllers/static_pages_controller.rb

@@ -19,9 +19,20 @@ def stats
       4    # TODO: 同上。上記の道場数を静的に足しています
     @sum_of_participants = EventHistory.sum(:participants)
 
-    # 2017年1月1日〜12月31日までの集計結果
-    @events_2017       = EventHistory.where('evented_at > ?', Time.zone.local(2017).beginning_of_year).count
-    @participants_2017 = EventHistory.where('evented_at > ?', Time.zone.local(2017).beginning_of_year).sum(:participants)
+    # 2012年1月1日〜2017年12月31日までの集計結果
+    @dojos, @events, @participants = {}, {}, {}
+    @range = (2012..2017)
+    @range.each do |year|
+      @dojos[year] =
+        Dojo.where(created_at:
+                     Time.zone.local(year).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
+      @participants[year] =
+        EventHistory.where(evented_at:
+                     Time.zone.local(year).beginning_of_year..Time.zone.local(year).end_of_year).sum(:participants)
+    end
   end
 
   def letsencrypt

app/views/static_pages/stats.html.haml

@@ -30,6 +30,29 @@
     \/ #{@dojo_count} Dojos
     %h3 計測間隔
     毎週月曜日
+
+    %h3 各統計の推移
+    %div{align: 'center'}
+      %table
+        %thead
+          %tr
+            %th
+            - @range.each do |year|
+              %td{style: 'padding: 0 5px'} #{year}年
+        %tbody{align: 'center'}
+          %tr
+            %td 新規道場数
+            - @range.each do |year|
+              %td #{@dojos[year]}
+          %tr
+            %td イベント数
+            - @range.each do |year|
+              %td #{@events[year]}
+          %tr
+            %td 参加者数
+            - @range.each do |year|
+              %td #{@participants[year]}
+
     %h3 関連リンク
     %ul{:style => "list-style: none; margin-left: -40px;"}
       %li