Add a rake task to generate missing Budget::Phase's and migrate descricptions

lib/tasks/budgets.rake

@@ -13,4 +13,22 @@ namespace :budgets do
 
   end
 
-end
+  namespace :phases do
+    desc "Generates Phases for existing Budgets without them & migrates description_* attributes"
+    task generate_missing: :environment do
+      Budget.where.not(id: Budget::Phase.all.pluck(:budget_id).uniq.compact).each do |budget|
+        Budget::Phase::PHASE_KINDS.each do |phase|
+          Budget::Phase.create(
+            budget: budget,
+            kind: phase,
+            description: budget.send("description_#{phase}"),
+            prev_phase: phases&.last,
+            starts_at: phases&.last&.ends_at || Date.current,
+            ends_at: (phases&.last&.ends_at || Date.current) + 1.month
+          )
+        end
+      end
+    end
+  end
+
+end