Use rubocop-rails (#10957)

.codeclimate.yml

@@ -30,7 +30,7 @@ plugins:
     channel: eslint-5
   rubocop:
     enabled: true
-    channel: rubocop-0-54
+    channel: rubocop-0-71
   scss-lint:
     enabled: true
 exclude_patterns:

.rubocop.yml

@@ -1,3 +1,6 @@
+require:
+  - rubocop-rails
+
 AllCops:
   TargetRubyVersion: 2.3
   Exclude:

Gemfile

@@ -129,6 +129,7 @@ group :development do
   gem 'letter_opener_web', '~> 1.3'
   gem 'memory_profiler'
   gem 'rubocop', '~> 0.71', require: false
+  gem 'rubocop-rails', '~> 2.0', require: false
   gem 'brakeman', '~> 4.5', require: false
   gem 'bundler-audit', '~> 0.6', require: false
   gem 'scss_lint', '~> 0.58', require: false

Gemfile.lock

@@ -534,6 +534,9 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.7)
+    rubocop-rails (2.0.0)
+      rack (>= 2.0)
+      rubocop (>= 0.70.0)
     ruby-progressbar (1.10.1)
     ruby-saml (1.9.0)
       nokogiri (>= 1.5.10)
@@ -746,6 +749,7 @@ DEPENDENCIES
   rspec-rails (~> 3.8)
   rspec-sidekiq (~> 3.0)
   rubocop (~> 0.71)
+  rubocop-rails (~> 2.0)
   sanitize (~> 5.0)
   scss_lint (~> 0.58)
   sidekiq (~> 5.2)