Add basic frontend for budget executions list

app/controllers/budgets/executions_controller.rb

@@ -0,0 +1,39 @@
+module Budgets
+  class ExecutionsController < ApplicationController
+    before_action :load_budget
+    before_action :load_heading
+    before_action :load_investments
+
+    load_and_authorize_resource :budget
+
+    def show
+      authorize! :read_executions, @budget
+      @statuses = ::Budget::Investment::Status.all
+    end
+
+    private
+
+      def load_budget
+        @budget = Budget.find_by(slug: params[:id]) || Budget.find_by(id: params[:id])
+      end
+
+      def load_heading
+        @heading = if params[:heading_id].present?
+                     @budget.headings.find_by(slug: params[:heading_id])
+                   else
+                     @heading = @budget.headings.first
+                   end
+      end
+
+      def load_investments
+        @investments = Budget::Result.new(@budget, @heading).investments.joins(:milestones)
+
+        if params[:status].present?
+          @investments.where('budget_investment_milestones.status_id = ?', params[:status])
+        else
+          @investments
+        end
+      end
+
+  end
+end