Add order scope to milestone for publication date

app/models/budget/investment/milestone.rb

@@ -14,6 +14,9 @@ class Budget
       validates :investment, presence: true
       validates :publication_date, presence: true
 
+
+      scope :order_by_publication_date, -> { order(publication_date: :asc) }
+
       def self.title_max_length
         80
       end