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Gemfile

@@ -37,6 +37,7 @@ group :development do
   gem 'listen', '~> 3.3'
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'
+  gem 'rubocop'
 end
 
 group :test do

Gemfile.lock

@@ -62,6 +62,7 @@ GEM
       zeitwerk (~> 2.3)
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
+    ast (2.4.2)
     bindex (0.8.1-x86_64-linux-musl)
     bootsnap (1.7.5-x86_64-linux-musl)
       msgpack (~> 1.0)
@@ -102,6 +103,9 @@ GEM
     nio4r (2.5.7-x86_64-linux-musl)
     nokogiri (1.11.7-x86_64-linux)
       racc (~> 1.4)
+    parallel (1.20.1)
+    parser (3.0.2.0)
+      ast (~> 2.4.1)
     pg (1.2.3-x86_64-linux-musl)
     public_suffix (4.0.6)
     puma (5.3.2-x86_64-linux-musl)
@@ -140,11 +144,25 @@ GEM
       method_source
       rake (>= 0.13)
       thor (~> 1.0)
+    rainbow (3.0.0)
     rake (13.0.6)
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     regexp_parser (2.1.1)
+    rexml (3.2.5)
+    rubocop (1.18.3)
+      parallel (~> 1.10)
+      parser (>= 3.0.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.7.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.8.0)
+      parser (>= 3.0.1.1)
+    ruby-progressbar (1.11.0)
     rubyzip (2.3.2)
     sass-rails (6.0.0)
       sassc-rails (~> 2.1, >= 2.1.1)
@@ -175,6 +193,7 @@ GEM
     turbolinks-source (5.2.0)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
+    unicode-display_width (2.0.0)
     web-console (4.1.0)
       actionview (>= 6.0.0)
       activemodel (>= 6.0.0)
@@ -209,6 +228,7 @@ DEPENDENCIES
   puma (~> 5.0)
   rack-mini-profiler (~> 2.0)
   rails (~> 6.1.4)
+  rubocop
   sass-rails (>= 6)
   selenium-webdriver
   spring

app/controllers/application_controller.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 class ApplicationController < ActionController::Base
 end

app/controllers/measurements_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class MeasurementsController < ApplicationController
   protect_from_forgery with: :null_session
 

app/helpers/application_helper.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 module ApplicationHelper
 end

app/jobs/application_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationJob < ActiveJob::Base
   # Automatically retry jobs that encountered a deadlock
   # retry_on ActiveRecord::Deadlocked

app/mailers/application_mailer.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationMailer < ActionMailer::Base
   default from: 'from@example.com'
   layout 'mailer'

app/models/application_record.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
 end

app/models/measurement.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Measurement < ApplicationRecord
   belongs_to :sensor
 end

app/models/sensor.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Sensor < ApplicationRecord
   has_many :measurements
 end