diff --git a/.rubocop.yml b/.rubocop.yml
index 049b22d..ff07d58 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -20,4 +20,10 @@ Metrics/ModuleLength:
 RSpec/MultipleMemoizedHelpers:
   Enabled: false
 Style/Documentation:
+  Enabled: false
+Metrics/MethodLength:
+  Max: 20
+Rails/SkipsModelValidations:
+  Enabled: false
+Metrics/AbcSize:
   Enabled: false
\ No newline at end of file
diff --git a/app/controllers/captcha_controller.rb b/app/controllers/captcha_controller.rb
index 351b324..77010bd 100644
--- a/app/controllers/captcha_controller.rb
+++ b/app/controllers/captcha_controller.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class CaptchaController < ApplicationController
   skip_before_action :authenticate_user!
   skip_before_action :set_tenant
   def create
-    id = LibreCaptcha.new.get_id
+    id = LibreCaptcha.new.id
     render json: {
       id:,
       media_url: media_captcha_index_url(id:)
diff --git a/app/services/affinity_groups_hierarchy.rb b/app/services/affinity_groups_hierarchy.rb
index e20de97..3e15551 100644
--- a/app/services/affinity_groups_hierarchy.rb
+++ b/app/services/affinity_groups_hierarchy.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class AffinityGroupsHierarchy < Array
diff --git a/app/services/libre_captcha.rb b/app/services/libre_captcha.rb
index 8684e9f..cfd8028 100644
--- a/app/services/libre_captcha.rb
+++ b/app/services/libre_captcha.rb
@@ -1,20 +1,20 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class LibreCaptcha
-  def get_id
-    HTTParty.post("http://libre-captcha:8888/v2/captcha", 
-      body: {
-        input_type: "text",
-        level: :hard,
-        media: 'image/png',
-        size: '350x100'
-      }.to_json
-    ).then { |raw| JSON.parse(raw)['id'] }
+  def id
+    HTTParty.post('http://libre-captcha:8888/v2/captcha',
+                  body: {
+                    input_type: 'text',
+                    level: :hard,
+                    media: 'image/png',
+                    size: '350x100'
+                  }.to_json).then { |raw| JSON.parse(raw)['id'] }
   end
 
   def valid?(id:, answer:)
-    HTTParty.post("http://libre-captcha:8888/v2/answer",
-      body: { id:, answer: }.to_json
-    ).then { |raw| JSON.parse(raw)['result'] == 'True' }
+    HTTParty.post('http://libre-captcha:8888/v2/answer',
+                  body: { id:, answer: }.to_json).then { |raw| JSON.parse(raw)['result'] == 'True' }
   end
-end
\ No newline at end of file
+end
diff --git a/app/services/tables/discomfort_calculator.rb b/app/services/tables/discomfort_calculator.rb
index c4ef54a..df5eeb4 100644
--- a/app/services/tables/discomfort_calculator.rb
+++ b/app/services/tables/discomfort_calculator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 module Tables
@@ -7,6 +9,7 @@ module Tables
         distance = AffinityGroupsHierarchy.instance.distance(id_a, id_b)
 
         return 1 if distance.nil?
+
         Rational(distance, distance + 1)
       end
     end
diff --git a/app/services/tables/distribution.rb b/app/services/tables/distribution.rb
index 9236007..8c8d152 100644
--- a/app/services/tables/distribution.rb
+++ b/app/services/tables/distribution.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require_relative '../../extensions/tree_node_extension'
diff --git a/app/services/tables/shift.rb b/app/services/tables/shift.rb
index 6ae7c94..f3882cc 100644
--- a/app/services/tables/shift.rb
+++ b/app/services/tables/shift.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 module Tables
diff --git a/app/services/tables/swap.rb b/app/services/tables/swap.rb
index ae74294..e2f7b60 100644
--- a/app/services/tables/swap.rb
+++ b/app/services/tables/swap.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 module Tables
diff --git a/app/services/tables/table.rb b/app/services/tables/table.rb
index 2c50435..7bec30f 100644
--- a/app/services/tables/table.rb
+++ b/app/services/tables/table.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 module Tables
diff --git a/app/services/vns/engine.rb b/app/services/vns/engine.rb
index ee50d45..555f7c7 100644
--- a/app/services/vns/engine.rb
+++ b/app/services/vns/engine.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 module VNS