Split common and specific stats methods

app/models/budget/stats.rb

@@ -3,11 +3,11 @@ class Budget::Stats
   alias_method :budget, :resource
 
   def self.stats_methods
-    %i[total_participants total_participants_support_phase total_participants_vote_phase
+    super +
+      %i[total_participants_support_phase total_participants_vote_phase
          total_budget_investments total_votes total_selected_investments
-      total_unfeasible_investments total_male_participants total_female_participants
-      total_supports total_unknown_gender_or_age age_groups male_percentage
-      female_percentage headings total_participants_web total_participants_booths]
+         total_unfeasible_investments total_supports headings
+         total_participants_web total_participants_booths]
   end
 
   private

app/models/concerns/statisticable.rb

@@ -70,6 +70,12 @@ module Statisticable
   end
 
   class_methods do
+    def stats_methods
+      %i[total_participants total_male_participants
+         total_female_participants total_unknown_gender_or_age
+         male_percentage female_percentage age_groups]
+    end
+
     def stats_cache(*method_names)
       method_names.each do |method_name|
         alias_method :"raw_#{method_name}", method_name