investment can not have many headings

app/models/budget.rb

@@ -20,5 +20,4 @@ class Budget < ActiveRecord::Base
     phase == "finished"
   end
 
-end
-
+end

app/models/budget/heading.rb

@@ -3,6 +3,8 @@ class Budget
     belongs_to :budget
     belongs_to :geozone
 
+    has_many :investments
+
     validates :budget_id, presence: true
     validates :name, presence: true
     validates :price, presence: true

app/models/budget/investment.rb

@@ -17,7 +17,6 @@ class Budget
     has_many :valuation_assignments, dependent: :destroy
     has_many :valuators, through: :valuation_assignments
     has_many :comments, as: :commentable
-    has_many :headings, dependent: :destroy
 
     validates :title, presence: true
     validates :author, presence: true