Clear stats cache after adding/removing PB supports/votes

app/models/budget/stats.rb

@@ -181,6 +181,11 @@ def supports(supportable)
     stats_cache(*stats_methods)
 
     def stats_cache(key, &)
-      Rails.cache.fetch("budgets_stats/#{budget.id}/#{phases.join}/#{key}/#{version}", &)
+      if budget.balloting_or_later?
+        cache_key = "budgets_stats/#{budget.id}/#{budget.lines.cache_key_with_version}/#{key}/#{version}"
+      else
+        cache_key = "budgets_stats/#{budget.id}/#{supports(budget).cache_key_with_version}/#{key}/#{version}"
+      end
+      Rails.cache.fetch(cache_key, &)
     end
 end

spec/system/admin/stats_spec.rb

@@ -111,6 +111,27 @@
         expect(page).to have_link "Go back", count: 1
       end
 
+      scenario "Clear cache after new supports", :with_cache do
+        investment = create(:budget_investment, heading: heading_all_city)
+        create(:user, :level_two, votables: [investment])
+
+        visit admin_stats_path
+        click_link "Participatory Budgets"
+        within("#budget_#{budget.id}") do
+          click_link "Supporting phase"
+        end
+
+        expect(page).to have_content "VOTES\n1"
+        expect(page).to have_content "PARTICIPANTS\n1"
+
+        create(:user, :level_two, votables: [investment])
+
+        refresh
+
+        expect(page).to have_content "VOTES\n2"
+        expect(page).to have_content "PARTICIPANTS\n2"
+      end
+
       scenario "hide final voting link" do
         visit admin_stats_path
         click_link "Participatory Budgets"
@@ -147,6 +168,26 @@
         expect(page).to have_content "VOTES\n3"
         expect(page).to have_content "PARTICIPANTS\n2"
       end
+
+      scenario "Clear cache after new votes", :with_cache do
+        create(:user, ballot_lines: [investment])
+
+        visit admin_stats_path
+        click_link "Participatory Budgets"
+        within("#budget_#{budget.id}") do
+          click_link "Final voting"
+        end
+
+        expect(page).to have_content "VOTES\n1"
+        expect(page).to have_content "PARTICIPANTS\n1"
+
+        create(:user, ballot_lines: [investment])
+
+        refresh
+
+        expect(page).to have_content "VOTES\n2"
+        expect(page).to have_content "PARTICIPANTS\n2"
+      end
     end
   end