extracts reclassification to a module

app/models/budget/investment.rb

@@ -5,6 +5,7 @@ class Budget
     include Sanitizable
     include Taggable
     include Searchable
+    include Reclassification
 
     acts_as_votable
     acts_as_paranoid column: :hidden_at
@@ -61,7 +62,6 @@ class Budget
     before_save :calculate_confidence_score
     before_validation :set_responsible_name
     before_validation :set_denormalized_ids
-    after_save :check_for_reclassification
 
     def self.filter_params(params)
       params.select{|x,_| %w{heading_id group_id administrator_id tag_name valuator_id}.include? x.to_s }
@@ -243,43 +243,6 @@ class Budget
       investments
     end
 
-    def check_for_reclassification
-     if heading_changed?
-       log_heading_change
-       store_reclassified_votes("heading_changed")
-       remove_reclassified_votes
-     elsif marked_as_unfeasible?
-       store_reclassified_votes("unfeasible")
-       remove_reclassified_votes
-     end
-    end
-
-    def heading_changed?
-      budget.balloting? && heading_id_changed?
-    end
-
-    def log_heading_change
-      update_column(:previous_heading_id, heading_id_was)
-    end
-
-    def marked_as_unfeasible?
-      budget.balloting? && feasibility_changed? && unfeasible?
-    end
-
-    def store_reclassified_votes(reason)
-      ballot_lines_for_investment.each do |line|
-        Budget::ReclassifiedVote.create!(user: line.ballot.user, investment: self, reason: reason)
-      end
-    end
-
-    def remove_reclassified_votes
-      ballot_lines_for_investment.destroy_all
-    end
-
-    def ballot_lines_for_investment
-      Budget::Ballot::Line.by_investment(self.id)
-    end
-
     private
 
       def set_denormalized_ids

app/models/budget/reclassification.rb

@@ -0,0 +1,47 @@
+class Budget
+  module Reclassification
+    extend ActiveSupport::Concern
+
+    included do
+      after_save :check_for_reclassification
+    end
+
+    def check_for_reclassification
+     if heading_changed?
+       log_heading_change
+       store_reclassified_votes("heading_changed")
+       remove_reclassified_votes
+     elsif marked_as_unfeasible?
+       store_reclassified_votes("unfeasible")
+       remove_reclassified_votes
+     end
+    end
+
+    def heading_changed?
+      budget.balloting? && heading_id_changed?
+    end
+
+    def log_heading_change
+      update_column(:previous_heading_id, heading_id_was)
+    end
+
+    def marked_as_unfeasible?
+      budget.balloting? && feasibility_changed? && unfeasible?
+    end
+
+    def store_reclassified_votes(reason)
+      ballot_lines_for_investment.each do |line|
+        Budget::ReclassifiedVote.create!(user: line.ballot.user, investment: self, reason: reason)
+      end
+    end
+
+    def remove_reclassified_votes
+      ballot_lines_for_investment.destroy_all
+    end
+
+    def ballot_lines_for_investment
+      Budget::Ballot::Line.by_investment(self.id)
+    end
+
+  end
+end