app/controllers/expenses_controller.rb

@@ -8,6 +8,10 @@ class ExpensesController < ApplicationController
     @expenses = Expense.all
   end
 
+  def summary
+    render json: Expenses::TotalQuery.new.call
+  end
+
   # GET /expenses/1 or /expenses/1.json
   def show
   end

config/routes.rb

@@ -6,7 +6,9 @@ Rails.application.routes.draw do
     post :import, on: :collection
     post :bulk_update, on: :collection
   end
-  resources :expenses
+  resources :expenses do
+    get :summary, on: :collection
+  end
   resources :tables_arrangements, only: [:index, :show]
 
   get 'up' => 'rails/health#show', as: :rails_health_check