improve: HTMLビューから道場数カラムを削除してシンプルに

- HTMLビューから道場数（counter）カラムを削除
- 道場名に☯️アイコンを復活
- 詳細な道場数はCSVで確認可能なため、HTMLはシンプルに保つ
- CSVには引き続き道場数カラムと合計を表示
- テストもHTML/CSVの役割分担に合わせて更新

Author: yasulab

app/views/dojos/index.html.erb

@@ -89,18 +89,11 @@
   <div style="margin-top: 20px;" align="center">
     <table border="1">
       <tr>
-        <th>
-          <small>
-	    🗾
-	    <br class='ignore-pc'>
-	    道場名 (ID 番号)
-	  </small>
-        </th>
         <th>
           <small>
 	    ☯️
 	    <br class='ignore-pc'>
-	    道場数
+	    道場名 (ID 番号)
 	  </small>
         </th>
         <th>
@@ -128,9 +121,6 @@
 	      <% end %>
 	    </small>
           </td>
-          <td style="text-align: center;">
-	    <small><%= dojo[:counter] %></small>
-          </td>
           <td>
 	    <small><%= dojo[:created_at].strftime("%F") %></small>
           </td>

spec/requests/dojos_spec.rb

@@ -178,21 +178,26 @@
         expect(multi_branch_row["道場数"]).to eq("3")
       end
 
-      it "calculates counter_sum correctly" do
-        get dojos_path(format: :html)
+      it "calculates counter_sum correctly for CSV" do
+        get dojos_path(format: :csv)
 
         expected_sum = [@dojo_2020_active, @dojo_2020_inactive, @dojo_2021_active, 
                        @dojo_2019_inactive, @dojo_multi_branch].sum(&:counter)
-        expect(assigns(:counter_sum)).to eq(expected_sum)
+        # @counter_sum はCSVで使用されるので、CSVリクエスト時に検証
+        csv = CSV.parse(response.body)
+        last_line = csv.last
+        expect(last_line[2]).to eq(expected_sum.to_s)
       end
 
-      it "calculates counter_sum for filtered year" do
-        get dojos_path(year: 2020, format: :html)
+      it "calculates counter_sum for filtered year in CSV" do
+        get dojos_path(year: 2020, format: :csv)
 
         # 2020年末時点でアクティブな道場のcounter合計
         active_in_2020 = [@dojo_2020_active, @dojo_2020_inactive, @dojo_multi_branch]
         expected_sum = active_in_2020.sum(&:counter)
-        expect(assigns(:counter_sum)).to eq(expected_sum)
+        csv = CSV.parse(response.body)
+        last_line = csv.last
+        expect(last_line[2]).to eq(expected_sum.to_s)
       end
     end