[WIP] Upgrade to Rails 6.0.1

.rubocop.yml

@@ -1,5 +1,21 @@
+inherit_from: .rubocop_todo.yml
+
+require:
+  - rubocop-performance
+  - rubocop-rails
+  - rubocop-rspec
+
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.6
+  CacheRootDirectory: ./tmp
+  # https://github.com/thoughtbot/factory_bot/issues/1160#issuecomment-421410237
+  RSpec:
+    Patterns:
+      - _test.rb
+      - "(?:^|/)test/"
+  RSpec/FactoryBot:
+    Patterns:
+      - test/factories/**/*.rb
   Include:
     - '**/Rakefile'
     - '**/config.ru'
@@ -8,15 +24,16 @@ AllCops:
     - 'db/**/*'
     - 'script/**/*'
     - 'vendor/**/*'
+    - 'vendor/**/.*'
     - 'node_modules/**/*'
 
 Rails:
   Enabled: true
 
-TrailingBlankLines:
+Layout/TrailingBlankLines:
   Enabled: true
 
-Documentation:
+Style/Documentation:
   Enabled: false
 
 Metrics/LineLength:
@@ -45,7 +62,7 @@ Rails/UnknownEnv:
     - staging
     - production
 
-Style/FileName:
+Naming/FileName:
   Exclude:
     - 'Gemfile'
     - 'Guardfile'

Gemfile

@@ -8,7 +8,7 @@ git_source(:github) do |repo_name|
 end
 
 ruby File.read(File.expand_path("../.ruby-version", __FILE__)).chomp
-gem "rails", "~> 5.2.3"
+gem "rails", "~> 6.0.1"
 
 gem "autoprefixer-rails", "~> 7.1", ">= 7.1.3"
 
@@ -62,15 +62,15 @@ gem "puma",                 "~> 4.0", ">= 4.0.1"
 gem "rack-canonical-host", "~> 0.2.3"
 gem "rack-rewrite",        "~> 1.5.0"
 gem "rack-timeout",        "~> 0.5.1", require: false
-gem "rails-i18n",          "~> 5.1", ">= 5.1.3"
+gem "rails-i18n",          "~> 6.0"
 gem "redis-namespace",     "~> 1.5", ">= 1.5.3"
 gem "ruby-progressbar",    "~> 1.8", ">= 1.8.1", require: false
 
 gem "kramdown",            "~> 1.17.0"
 
-gem "sass-rails", "~> 5.0", ">= 5.0.6"
+gem "sass-rails", "~> 6.0"
 gem "sidekiq",    "~> 5.2", ">= 5.2.7"
-gem "sprockets",  "~> 3.7", ">= 3.7.2"
+gem "sprockets",  "~> 3.7.2"
 
 gem "turbolinks", "~> 2.5", ">= 2.5.4"
 gem "typhoeus",   "~> 1.3"
@@ -90,8 +90,11 @@ group :development, :test do
   gem "guard-rspec",              "~> 4.7", ">= 4.7.3", require: false
   gem "knapsack",                 "~> 1.14", ">= 1.14.1"
   gem "rails-controller-testing", "~> 1.0", ">= 1.0.4"
-  gem "rspec-rails",              "~> 3.6", ">= 3.6.1"
-  gem "rubocop",                  "~> 0.49.1", require: false
+  gem "rspec-rails",              ">= 4.0.0.beta3"
+  gem "rubocop",                  "~> 0.74", :require => false
+  gem "rubocop-performance",      "~> 1.4", :require => false
+  gem "rubocop-rails",            "~> 2.3", :require => false
+  gem "rubocop-rspec",            "~> 1.30", ">= 1.30.1", require: false
   gem "scss_lint",                "~> 0.54.0", require: false
   gem "spring",                   "~> 2.1", ">= 2.1.0"
   gem "spring-watcher-listen",    "~> 2.0", ">= 2.0.1"
@@ -109,7 +112,7 @@ group :production do
 end
 
 group :test do
-  gem "action-cable-testing", "~> 0.3"
+  gem "action-cable-testing", "~> 0.6.0"
   gem "database_cleaner",     "~> 1.6", ">= 1.6.1"
   gem "factory_bot_rails",    "~> 4.8"
   gem "faker",                "~> 1.8", ">= 1.8.4"