Assign groups to investments

app/models/budget/investment.rb

@@ -35,6 +35,9 @@ class Budget
     has_many :valuator_assignments, dependent: :destroy
     has_many :valuators, through: :valuator_assignments
 
+    has_many :valuator_group_assignments, dependent: :destroy
+    has_many :valuator_groups, through: :valuator_group_assignments
+
     has_many :comments, -> {where(valuation: false)}, as: :commentable, class_name: 'Comment'
     has_many :valuations, -> {where(valuation: true)}, as: :commentable, class_name: 'Comment'
 

app/models/budget/valuator_group_assignment.rb

@@ -0,0 +1,6 @@
+class Budget
+  class ValuatorGroupAssignment < ActiveRecord::Base
+    belongs_to :valuator_group
+    belongs_to :investment
+  end
+end