Use Rubocop

.rubocop.yml

@@ -0,0 +1,2 @@
+Documentation:
+  Enabled: false

config/unicorn.rb

@@ -1,5 +1,5 @@
 preload_app true
-worker_processes (ENV['WORKER_PROCESSES'] || 4).to_i
+worker_processes((ENV['WORKER_PROCESSES'] || 4).to_i)
 timeout 10
 
 before_fork do |_, _|

deploy/before_restart

@@ -2,15 +2,15 @@
 oldrev, newrev = ARGV
 
 def run(cmd)
-  exit($?.exitstatus) unless system "umask 002 && #{cmd}"
+  exit($CHILD_STATUS.exitstatus) unless system "umask 002 && #{cmd}"
 end
 
-run "foreman run bundle install --deployment --without development:test"
-run "whenever --update-crontab"
+run 'foreman run bundle install --deployment --without development:test'
+run 'whenever --update-crontab'
 
 tasks = []
 num_migrations = `git diff #{oldrev} #{newrev} --diff-filter=A --name-only -z db/migrate`.split("\0").size
-tasks << "db:migrate" if num_migrations > 0
-tasks << "rates:update"
+tasks << 'db:migrate' if num_migrations > 0
+tasks << 'rates:update'
 
 run "foreman run bundle exec rake #{tasks.join(" ")}" if tasks.any?

lib/quote.rb

@@ -6,7 +6,7 @@ require 'currency'
 class Quote
   include Virtus.value_object
 
-  DEFAULT_BASE = 'EUR'
+  DEFAULT_BASE = 'EUR'.freeze
 
   values do
     attribute :base, String, default: DEFAULT_BASE
@@ -53,8 +53,8 @@ class Quote
     rates
   end
 
-  # I'm mimicking the apparent convention of the ECB here.
+  # I'm mimicking the apparent convention of the ECB here.
   def round_rate(rate)
-    Float("%.#{5}g" % rate)
+    Float(format('%.5g', rate))
   end
 end