adds feature flag for admin/budgets management

app/controllers/admin/budget_headings_controller.rb

@@ -1,4 +1,6 @@
 class Admin::BudgetHeadingsController < Admin::BaseController
+  include FeatureFlags
+  feature_flag :budgets
 
   def create
     @budget = Budget.find params[:budget_id]

app/controllers/admin/budget_investments_controller.rb

@@ -1,4 +1,6 @@
 class Admin::BudgetInvestmentsController < Admin::BaseController
+  include FeatureFlags
+  feature_flag :budgets
 
   before_action :load_budget
   before_action :load_investment, only: [:show, :edit, :update]

app/controllers/admin/budgets_controller.rb

@@ -1,4 +1,6 @@
 class Admin::BudgetsController < Admin::BaseController
+  include FeatureFlags
+  feature_flag :budgets
 
   has_filters %w{open finished}, only: :index
 

app/controllers/budgets_controller.rb

@@ -1,4 +1,7 @@
 class BudgetsController < ApplicationController
+  include FeatureFlags
+  feature_flag :budgets
+
 
   load_and_authorize_resource
   respond_to :html, :js

spec/features/admin/budget_investments_spec.rb

@@ -9,6 +9,15 @@ feature 'Admin budget investments' do
     @budget = create(:budget)
   end
 
+  context "Feature flag" do
+
+    scenario 'Disabled with a feature flag' do
+      Setting['feature.budgets'] = nil
+      expect{ visit admin_budgets_path }.to raise_exception(FeatureFlags::FeatureDisabled)
+    end
+
+  end
+
   context "Index" do
 
     scenario 'Displaying investmentss' do