organization level stats rollup

app/controllers/organizations_controller.rb

@@ -1,5 +1,5 @@
 class OrganizationsController < ApplicationController
-  actions_without_auth :index, :show, :events
+  actions_without_auth :index, :show, :events, :stats
 
   def index
     orgs = Organization.order('organizations.id asc')
@@ -19,6 +19,14 @@ def show
     render json: OrganizationDetailPresenter.new(org)
   end
 
+  def stats
+    org = Organization.find(params[:organization_id])
+    stats = Rails.cache.fetch("org_stats_#{org.id}", expires_in: 5.minutes) do
+      Hash[org.stats_hash]
+    end
+    render json: stats
+  end
+
   def events
     user_ids = Organization.find_by!(id: params[:organization_id]).users.pluck(:id)
 

app/models/organization.rb

@@ -7,4 +7,14 @@ class Organization < ActiveRecord::Base
   validates_attachment :profile_image,
       content_type: { content_type: ["image/jpeg", "image/gif", "image/png"] },
       size: { in: 0..15.megabytes }
+
+  def stats_hash
+    (Hash.new { |h, k| h[k] = 0 }).tap do |accum|
+      users.each do |u|
+        u.stats_hash.each do |k, v|
+          accum[k] += v
+        end
+      end
+    end
+  end
 end

config/routes.rb

@@ -171,6 +171,7 @@
 
     resources 'organizations', only: [:index, :show] do
       get 'events' => 'organizations#events'
+      get 'stats' => 'organizations#stats'
     end
 
     resources 'subscriptions', except: [:update] do