diff --git a/app/controllers/stats_controller.rb b/app/controllers/stats_controller.rb
index 8045a65..093fbe9 100644
--- a/app/controllers/stats_controller.rb
+++ b/app/controllers/stats_controller.rb
@@ -8,15 +8,12 @@ class StatsController < ApplicationController
   before_action :authenticate_usuarie!
   before_action :authorize_stats
 
-  INTERVALS = %i[hour day week month year].freeze
-  RESOURCES = %i[builds space_used build_time].freeze
   EXTRA_OPTIONS = {
     builds: {},
     space_used: { bytes: true },
     build_time: {}
   }.freeze
 
-
   # XXX: Permitir a Chart.js inyectar su propio CSS
   content_security_policy only: :index do |policy|
     policy.style_src :self, :unsafe_inline
@@ -85,7 +82,7 @@ class StatsController < ApplicationController
   # toma de estadísticas y restando el tiempo que pasó desde ese
   # momento.
   def chart_options
-    time = last_stat.created_at + (1.send(interval))
+    time = last_stat.created_at + 1.try(interval)
     please_return_at = { please_return_at: distance_of_time_in_words(Time.now, time) }
 
     @chart_options ||= {
@@ -102,14 +99,14 @@ class StatsController < ApplicationController
   def interval
     @interval ||= begin
       i = params[:interval].to_sym
-      INTERVALS.include?(i) ? i : :day
+      Stat::INTERVALS.include?(i) ? i : :day
     end
   end
 
   def resource
     @resource ||= begin
       r = params[:resource].to_sym
-      RESOURCES.include?(r) ? r : :builds
+      Stat::RESOURCES.include?(r) ? r : :builds
     end
   end
 
diff --git a/app/models/stat.rb b/app/models/stat.rb
index cf717b0..1e3af9e 100644
--- a/app/models/stat.rb
+++ b/app/models/stat.rb
@@ -1,3 +1,6 @@
 # frozen_string_literal: true
 
-class Stat < ApplicationRecord; end
+class Stat < ApplicationRecord
+  INTERVALS = %i[hour day week month year].freeze
+  RESOURCES = %i[builds space_used build_time].freeze
+end
diff --git a/app/views/stats/index.haml b/app/views/stats/index.haml
index 101dee1..992200a 100644
--- a/app/views/stats/index.haml
+++ b/app/views/stats/index.haml
@@ -9,7 +9,7 @@
           "#{time_ago_in_words @last_stat.created_at}."
 
     .mb-3
-      - StatsController::INTERVALS.each do |interval|
+      - Stat::INTERVALS.each do |interval|
         = link_to t(".#{interval}"), site_stats_path(interval: interval), class: "btn #{'btn-primary active' if params[:interval].to_sym == interval}"
 
     .mb-3
@@ -17,7 +17,7 @@
       %p.lead= t('.host.description')
       = line_chart site_stats_host_path(@chart_params), **@chart_options
 
-    - StatsController::RESOURCES.each do |resource|
+    - Stat::RESOURCES.each do |resource|
       .mb-3
         %h2= t(".resources.#{resource}.title")
         %p.lead= t(".resources.#{resource}.description")