Report ready

app/controllers/homies_controller.rb

@@ -11,7 +11,12 @@ class HomiesController < ApplicationController
      error_response(:bad_request)
    end
   end
+  
+  def cash
+    json_response(Homie.cash(params[:importance]))
+  end
 
+  private
   def homie_params 
     params.require(:homie).permit(
       :name, 
@@ -19,4 +24,5 @@ class HomiesController < ApplicationController
       :about
     )
   end
+
 end

app/models/homie.rb

@@ -1,4 +1,15 @@
 class Homie < ApplicationRecord
   has_many :money_moves_from, class_name: 'MoneyMove', foreign_key: :from_homie_id
   has_many :money_moves_to, class_name: 'MoneyMove', foreign_key: :to_homie_id
+
+  def self.cash(importance)
+    got = Homie.all.joins(:money_moves_to).group(:id).order(:id).sum(:amount)
+    owe = Homie.all.joins(:money_moves_from).group(:id).order(:id).sum(:amount)
+
+    result = [] 
+    Homie.where(["importance > ?", importance]).map do |homie|
+      total = got.fetch(homie.id, 0) - owe.fetch(homie.id,0)
+      { homie: homie, amount: total } 
+    end
+  end
 end

config/routes.rb

@@ -1,7 +1,12 @@
 Rails.application.routes.draw do
   constraints format: :json do
-    resources :money_moves
-    resources :homies
+    resources :money_moves    
+    resources :homies  do 
+      collection do 
+        get 'cash'
+      end
+    end
+
   end
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
 end