Mark Rails/ApplicationController and similar cops as unsafe autocorrect

We have a controller class which inherits `ActionController::Base` directly.
That controller is for health check endpoint.

```ruby
class HealthCheckController < ActionController::Base
  # we want to skip some authentication logics...
  def index
    head :ok
  end
end
```

```ruby
class ApplicationController < ActionController::Base
  # default some authentication logics...
end
```

In such case, automatically modifying the `ActionController :: Base`->` ApplicationController` is not safe .

Author: hoshinotsuyoshi

CHANGELOG.md

@@ -9,6 +9,10 @@
 * [#214](https://github.com/rubocop-hq/rubocop-rails/issues/214): Fix an error for `Rails/UniqueValidationWithoutIndex`when a table has no column definition. ([@koic][])
 * [#221](https://github.com/rubocop-hq/rubocop-rails/issues/221): Make `Rails/UniqueValidationWithoutIndex` aware of `add_index` in db/schema.rb. ([@koic][])
 
+### Changes
+
+* [#223](https://github.com/rubocop-hq/rubocop-rails/pull/223): Mark `Rails/ApplicationController`, `Rails/ApplicationJob`, `Rails/ApplicationMailer`, and `Rails/ApplicationRecord` as unsafe autocorrect. ([@hoshinotsuyoshi][])
+
 ## 2.5.0 (2020-03-24)
 
 ### New features
@@ -157,3 +161,4 @@
 [@joshpencheon]: https://github.com/joshpencheon
 [@djudd]: https://github.com/djudd
 [@sunny]: https://github.com/sunny
+[@hoshinotsuyoshi]: https://github.com/hoshinotsuyoshi

config/default.yml

@@ -57,22 +57,30 @@ Rails/ActiveSupportAliases:
 Rails/ApplicationController:
   Description: 'Check that controllers subclass ApplicationController.'
   Enabled: true
+  SafeAutoCorrect: false
   VersionAdded: '2.4'
+  VersionChanged: '2.5'
 
 Rails/ApplicationJob:
   Description: 'Check that jobs subclass ApplicationJob.'
   Enabled: true
+  SafeAutoCorrect: false
   VersionAdded: '0.49'
+  VersionChanged: '2.5'
 
 Rails/ApplicationMailer:
   Description: 'Check that mailers subclass ApplicationMailer.'
   Enabled: true
+  SafeAutoCorrect: false
   VersionAdded: '2.4'
+  VersionChanged: '2.5'
 
 Rails/ApplicationRecord:
   Description: 'Check that models subclass ApplicationRecord.'
   Enabled: true
+  SafeAutoCorrect: false
   VersionAdded: '0.49'
+  VersionChanged: '2.5'
 
 Rails/AssertNot:
   Description: 'Use `assert_not` instead of `assert !`.'

manual/cops_rails.md

@@ -131,7 +131,7 @@ are not used.
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | 2.4 | -
+Enabled | Yes | Yes (Unsafe) | 2.4 | 2.5
 
 This cop checks that controllers subclass ApplicationController.
 
@@ -153,7 +153,7 @@ end
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | 0.49 | -
+Enabled | Yes | Yes (Unsafe) | 0.49 | 2.5
 
 This cop checks that jobs subclass ApplicationJob with Rails 5.0.
 
@@ -175,7 +175,7 @@ end
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | 2.4 | -
+Enabled | Yes | Yes (Unsafe) | 2.4 | 2.5
 
 This cop checks that mailers subclass ApplicationMailer with Rails 5.0.
 
@@ -197,7 +197,7 @@ end
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | 0.49 | -
+Enabled | Yes | Yes (Unsafe) | 0.49 | 2.5
 
 This cop checks that models subclass ApplicationRecord with Rails 5.0.